EFFECT OF MODERATE ENDURANCE TRAINING (60% Vo2max) ON MORPHOLOGICAL CHARACTERISTICS AND MUSCLE STRENGTH IN HUMAN THIGH MUSCLES
10.7600/jspfsm1949.44.365
- VernacularTitle:中強度 (60%Vo2max) の持久性トレーニングにともなうヒトの大腿部における筋の形態的特性および脚筋力の変化
- Author:
HIROSHI AKIMA
;
SHIN-YA KUNO
;
NOBORU WATANABE
;
HIDEHIKO NAKAJIMA
;
YUJI ITAI
;
SHIGERU KATSUTA
- Publication Type:Journal Article
- Keywords:
endurance training;
muscle hypertrophy;
muscle cross-sectional area;
isokinetic strength;
MRI
- From:Japanese Journal of Physical Fitness and Sports Medicine
1995;44(3):365-374
- CountryJapan
- Language:Japanese
-
Abstract:
In this study, the effect of moderate endurance training on muscle morphological properties of human thigh muscles and isokinetic strength was examined. Five sedentary females carried out a training program of 30 min./day, 3 times a week for a ten-week period. The load requirement was set to 60% of maximal aerobic capacity (Vo2max) of the subjects. In the determination of muscle cross-sectional areas (CSAs) by MRI, longitudinal sections were first imaged, and ten axial images along the length of femur were taken before and after the endurance training. Muscle CSA and mus-cle volume of knee extensors (KE), flexors (KF), and adductors (AD) were calculated, using the ten axial images. Vo2max was significantly increased after endurance training (14.6%, p<0.01) . Muscle CSA in KE was significantly increased at the ten levels of femur length. There were also significant increases at seven levels of femur length after endurance training in KF (p<0.05, and 0.01) . Percentage increase of msucle CSA in KE and KF were 10.9 to 16.5% and 7.7 to 15.8%, respectively. Although the muscle volume of KE, KF, and AD was significantly increased, no change in fat volume was observed after endurance training. Isokinetic knee extension and flexion peak torque and peak torque per unit of muscle CSA at three angular velocities (30, 180, and 300 deg/sec) didn't show significant changes. These results suggest that muscle hypertrophy induced by moderate endurance training has no effect on muscle strength.
