pISSN : 2383-6415   eISSN : 2383-6423

Comparison of Hypertrophic Effects of Low-Intensity Exercise on Rat Hindlimb Muscles between Every Other Day Exercise and Everyday Exercise


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INFORMATION : page. 1~7 / 2011 Vol.13 No.1


ABSTRACT

장기간의 부동에 의해 전신적으로 최대 산소소모량, 심박출량, 정맥환류, 심근수축력 및 혈액용적이 감소하며 국소적으로 근위축이 초래된다. 부동에 의한 근위축으로 근력이 매일 약 5%씩 저하되고 근용적 및 근지구력의 감소가 동반된다(Kasper, 2003). 또한 활동저하 상태가 되면 근육의 단백질 합성 속도가 감소하기 시작하여 근위축이 발생하며 처음 1주일 동안 가장 급격히 나타나고 1-2개월 경과하면 근육 크기가 반으로 줄어들게 된다. 이러한 근위축은 주로 Type I 근섬유로 구성된 하지의 항중력근에 나타난다(Choe, 1998). 특히 불용성 근위축 과정에서 근섬유 횡단면적과 Type I 근섬유 비율이 모두 감소하므로 Type I 근섬유에 많이 함유된 미토콘드리아 효소의 농도와 활성을 저하시켜 근육의 산화능력을 감소시킨다 (Jakobsson, Borg, Edstrom, & Grimby, 1988).

Purpose: The purpose of this study was to compare the hypertrophic effects of low-intensity exercise on weight, myofibrillar protein content and Type I, II fiber cross-sectional area of hindlimb muscles of rats between every other day exercise and every day exercise. Methods: Adult male Sprague-Dawley rats were assigned to 1 of 3 groups: control group (C, n=6), experimental group 1 (E1, n=7) and experimental group 2 (E2, n=7). Rats in E1 group had 7 sessions (every other day) and those in E2 group had 14 sessions (every day) of exercise in which they ran on a treadmill for 30 min/day at 10 m/min. Results: Muscle weight, cross-sectional area of type I fiber and myofibrillar protein content of soleus and myofibrillar protein content of plantaris in E1 group, and myofibrillar protein content of soleus and cross-sectional area of type I fiber of plantaris in E2 group were greater than those in C group. Cross-sectional area of type I fiber of soleus of E1 group was higher than E2 group while cross-sectional area of type I fiber of plantaris of E2 group was higher than E1 group. Conclusion: Hypertrophy of hindlimb muscles occurs from every other day exercise similar to every day exercise.

Keyword :

Exercise,Muscular weight,Muscle fiber cross-sectional area,Myofibrillar protein,운동,근무게,근섬유 횡단면적,근원섬유 단백질


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