<div style="text-align:center;"><span style="font-family:'se-nanumgothic', sans-serif;font-size:32px;white-space:pre-wrap;">피로(fatigue)란 무엇인가?</span></div> <div style="text-align:center;"><span style="font-family:'se-nanumgothic', sans-serif;font-size:32px;white-space:pre-wrap;"><br></span></div> <div style="text-align:center;"> <div class="se-component se-text se-l-default" style="margin:0px;padding:0px;border:0px;font-size:medium;line-height:inherit;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;text-align:left;"> <div class="se-component-content" style="margin:0px auto;padding:0px 40px;border:0px;font:inherit;vertical-align:baseline;max-width:100%;"> <div class="se-section se-section-text se-l-default" style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;"> <div class="se-module se-module-text" style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 운동에 있어 피로(fatigue)란 정의하기 참 어렵다. </span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 운동 중에 피로를 가져오는 것이 무엇인가?라고 사람들에게 물었을 때 가장 보편적인 대답은 "젖산(lactic acid)"일 것이다. 하지만 이것은 극히 일부에 불과하며 오히려 젖산이 운동능력에 실질적으로 유익한 영향을 미치기도 한다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 피로는 아주 복잡한 현상이다.</span></p></div></div></div></div> <div class="se-component se-quotation se-l-quotation_line" style="margin:40px 0px 0px;padding:0px;border:0px;font-size:medium;line-height:inherit;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;text-align:left;"> <div class="se-component-content" style="margin:0px auto;padding:0px 40px;border:0px;font:inherit;vertical-align:baseline;max-width:100%;"> <div class="se-section se-section-quotation se-l-quotation_line" style="margin:0px auto;padding:10px 0px;border:0px;font:inherit;vertical-align:baseline;"><blockquote class="se-quotation-container" style="margin:auto;padding:0px 20px;border:0px;font:inherit;vertical-align:baseline;"> <div class="se-module se-module-text se-quote" style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs15 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">1. 에너지 전달 속도의 감소 (ATP 공급의 지연)</span></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs15 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">2. 젖산염과 H+같은 대사 부산물의 축적 (근육 및 체액 산성화)</span></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs15 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">3. 근섬유 수축 작용의 문제</span></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs-fs15 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">4. 근 수축에 대한 신경 조절의 변화</span></span></p></div></blockquote></div></div></div> <div class="se-component se-text se-l-default" style="margin:40px 0px 0px;padding:0px;border:0px;font-size:medium;line-height:inherit;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;text-align:left;"> <div class="se-component-content" style="margin:0px auto;padding:0px 40px;border:0px;font:inherit;vertical-align:baseline;max-width:100%;"> <div class="se-section se-section-text se-l-default" style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;"> <div class="se-module se-module-text" style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:0px;line-height:1.8;font-family:inherit;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">1. 에너지 시스템과 피로</span></span></p></div></div></div></div></div> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/202001/15786188928a54fee02b974e1b9ac23ee135bf9bf2__mn125527__w850__h462__f24578__Ym202001.png" width="800" height="435" alt="1.png" class="chimg_photo" style="font-size:9pt;border:none;" filesize="24578"></div> <div style="text-align:center;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.5;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;color:#555555;">PCr이 CK 효소로 분해되면 크레아틴+인산+에너지가 생성된다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.5;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;color:#555555;">대사과정이 간단하여 매우 빠른 속도로 ATP(에너지원)를 만들 수 있다는 장점이 있다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.5;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;color:#555555;"><br></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 짧은 시간의 고강도 운동은 PCr을 급격히 소진시킨다. PCr은 수초 이내에 고갈되며 그 이후에는 무산소성/유산소성 대사과정을 통해 ATP(우리 몸의 에너지원)를 만들어 내야 하는데, 에너지 생산 속도보다 사용 속도가 더 빠를 경우, 즉 운동 강도가 매우 높고 그것이 지속될 경우 피로를 느끼게 된다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 전력 질주 달리기를 할 때 100m 이상 그 속도를 유지할 수 없는 이유가 바로 여기에 있다. (후천적 훈련과 크레아틴의 적절한 섭취는 더 많은 PCr을 보유할 수 있다.)</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 위 그림과 같이 PCr 대사과정 부산물로 Pi(인산)이 생성되는데, 이것이 피로의 잠재적 원인으로 보인다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.5;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;color:#555555;"></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 두 번째로는 글로코겐의 고갈이다.</span></p></div> <div style="text-align:center;"><br></div> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/202001/157861889491e7f03100504801938ce6528fa5e54b__mn125527__w1012__h1440__f132503__Ym202001.jpg" width="800" height="1138" alt="2.jpg" class="chimg_photo" style="border:none;" filesize="132503"></div> <div style="text-align:center;"><br></div> <div style="text-align:center;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 글리코겐은 PCr 만큼은 아니지만 비교적 단순한 대사과정으로 빠른 시간내에 에너지원을 만들어낼 수 있다는 장점이 있다. 그러나 안타깝게도 체내 글리코겐 저장량은 한정되어 있으며 (인종/성별/훈련정도에 따라 다르지만 간과 근육에 약 250~600g) 빠르게 고갈된다. </span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 전력질주시 걷기에 비해 약 35~40배 빠르게 소모됨.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 재미있는 사실은, 글리코겐 소모량과 피로도가 반비례하기는 하지만 그 곡선의 정도가 같지 않다는 점이다. 비교적 높은 강도(70%VO2MAX)에서 3시간 트레드밀 달리기를 하였을 때 피험자들은 빠른 속도로 글리코겐을 사용하고 있음에도 운동 시작에 느꼈던 피로감과 크게 다른 점을 느끼지 못하였다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 그러나 글리코겐이 거의 소모될 즈음부터 피로의 강도가 높아지기 시작했다는 것이다. 따라서 장시간 운동 시 피로는 글리코겐 농도차이에서 오는 것이지 고갈의 속도와는 관련이 없다는 것이다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 또 한 가지 재미있는 사실</span><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"><strike style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:inherit;">(혹시 나만 재밌어!?)</strike></span><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">은, 운동 강도에 따라 Type l 혹은 Type ll 섬유로부터 선택적으로 글리코겐이 고갈된다는 것이다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 즉 높은 강도와 스피드를 요하는 운동에서는 Type ll의 글리코겐이, 중/저강도의 운동에서는 Type l의 글리코겐이 선택적으로 사용된다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 또한 여러 실험을 통해 오르막/내리막/평지 그 어떤 형태의 달리기를 하더라도 허벅지보다 비복근/가자미근의 글리코겐 고갈이 더 빠르다는 것이 나타났다. 따라서 장거리 달리기 동안 대퇴부보다는 하퇴부에서 피로가 많이 나타날 것을 시사한다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">2. 신진대사 부산물과 피로</span></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 위 언급했듯 PCr 대사과정의 부산물 Pi(인산)와 열, 젖산염, 수소이온(H+)이 있다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 남자 사이클 선수들을 대상으로 각각 4˚C, 11˚C, 21˚C, 31˚C의 서로 다른 대기 온도에서 운동 시간을 조사하였는데 결과는 11˚C에서 운동 시간이 가장 길었으며 31˚C에서 가장 빨리 피로를 느꼈다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 사람들이 가장 많이 알고 있는 부산물로써 젖산, 그러나 젖산은 비교적 짧은 시간, 고강도 운동에서만 근섬유 내에 축적된다. 예를 들어 마라톤 선수는 경기가 끝났을 때 극도한 피로감을 느끼지만 휴식 때와 거의 같은 혈액 내 젖산 농도를 보여준다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 젖산은 분리되면서 젖산염으로 바뀌어 수소이온(H+)의 축적을 가져온다. H+가 축적되면 근육의 산성화를 가져온다.</span></p></div> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/202001/15786188932a72eb4d9075451d8b3e698d9716605a__mn125527__w922__h624__f24043__Ym202001.png" width="800" height="541" alt="3.png" class="chimg_photo" style="border:none;" filesize="24043"></div> <div style="text-align:center;"><br></div> <div style="text-align:center;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 우리 몸에는 중탄산염(HCO3-)같은 완충제가 있어 H+의 영향을 최소화시킨다. 이러한 완충제가 없다면 우리 몸의 pH는 1.5까지 내려가 세포들이 괴사할 것이다. 휴식 시 우리몸의 pH는 약7.1, 운동 이후 기진맥진한 상태이더라도 중탄산염이 pH6.6~6.4이하로는 내려가지 않도록 해준다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 다만 이러한 작은 pH변화로도 근육 수축에 큰 방해를 끼친다. pH6.9이하가 되면 무산소성 대사과정의 속도조절 효소 PFK의 작용을 방해하여 ATP 생산에 차질을 주며 pH6.4 정도가 되면 더 이상 글로코겐 분해가 일어나지 못해 기진맥진하게 된다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 이 외에도 H+는 근섬유 내에서의 칼슘 결합을 감소시켜 액틴-마이오신 교차다리 형성을 방해해 근 수축력을 떨어뜨린다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 전력을 다한 달라기 이후 근육 내 pH를 정상 수준으로 되돌리는데에 약 30~35분의 회복시간이 필요하다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs- se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:15px;line-height:inherit;vertical-align:baseline;"><span style="font-weight:700;background-color:inherit;font-family:inherit;">3. 중추신경계와 피로</span></span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 피험자의 근육이 거의 힘이 다 빠진 것처럼 보일 때 말로 격려하거나 고함을 지르거나, 심지어 근육에 직접적인 전기 자극을 가하면</span><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"><strike style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:inherit;">(너무 하네..)</strike></span><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 근육 수축의 강도를 증가시킬 수 있었다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 실제로 대부분의 연구진들이 근육의 생리적 한계점에 도달하기 이르기 전 미리 피로를 느낀다는 것에 의견이 일치한다.</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"><br></span></p></div> <div style="text-align:center;"><img src="http://thimg.todayhumor.co.kr/upfile/202001/15786188948f3036b75dec44759ed8a29b50f08c23__mn125527__w1280__h720__f107813__Ym202001.jpg" width="800" height="450" alt="4.jpg" class="chimg_photo" style="border:none;" filesize="107813"></div> <div style="text-align:center;"><br></div> <div style="text-align:center;"> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 예를 들어 최대산소섭취량(VO2max)을 측정하기 위한 트레드밀 달리기를 할 때 대부분이 생리적 VO2max 지점에 들어서기 전 자의적 피로를 느끼며 이를 peak VO2max라고 한다. 그러나 잘 단련된 마라토너들은 자의적 피로인 peak VO2max 보다 더 높은 VO2max 수준에 도달한다. </span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> </span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">* 참고 문헌</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 운동과 스포츠 생리학 (대한미디어)</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;"> 장코치 사견</span></p> <p class="se-text-paragraph se-text-paragraph-align-" style="margin:0px;padding:0px;border:0px;font-size:0px;line-height:1.8;font-family:'se-nanumgothic', sans-serif;vertical-align:baseline;white-space:pre-wrap;text-align:left;"><span class="se-fs-fs13 se-ff-" style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-size:13px;line-height:inherit;vertical-align:baseline;">​</span></p></div><br>