Problem
I. Name one physiological factor that controls mean EMG amplitude?
II. Motor unit is one motor neuron and all the muscle fibers it innervates. Each motor neuron innervates several of the same type of muscle fibers but each muscle fiber is innervated by only one motor neuron. Activating more motor units increases motor unit recruitment; hence, the whole muscle will produce a stronger contraction
i. True
ii. False
III. Define EMG.
IV. From experiment 1, did you see muscle fatigue in one of the arms? If so, name one factor, which is responsible for muscle fatigue.
V. A person was holding a bag of 4 lbs with his non dominant arm for 1 minute at 45 degrees. He is now holding it for 2 minutes. Will the number of activated motor units change while holding for 2 minutes instead of 1 minutes? If so, why?