Volitional Weight-Lifting in Rats Promotes Adaptation via Performance and Muscle Morphology prior to Gains in Muscle Mass.

摘要: Investigation of volitional animal models resistance training has been instrumental in our understanding adaptive training. However, these studies have lacked reactive force measurements, a precise performance measure, and morphological analysis at distinct phase – when initial strength gains precede muscle hypertrophy. Our aim was to expose rats one month (70 or 700 g load) on custom-designed weight-lifting apparatus for forces morphology prior Exclusively following load training, increased by 21% whereas masses remained unaltered. For soleus (SOL) tibialis anterior (TA) muscles, fiber number per unit area ~20% decreased ~20%. Additionally, fibers section 18% SOL muscles. These results establish that alterations accompany early model load-dependent