A Practical Guide to Developing Resistance-Training Programs by Jay R., Ph.D. Hoffman, Nicholas A., Ph.D. Ratamess

By Jay R., Ph.D. Hoffman, Nicholas A., Ph.D. Ratamess

Publication by way of Hoffman, Jay R., Ph.D., Ratamess, Nicholas A., Ph.D.

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The interaction between acetylcholine and its receptor on the postsynaptic membrane will cause an increase in the permeability of both sodium and potassium ions to cross the membrane. As the result, the action potential is spread to the muscle and calcium will be released from the sarcoplasmic reticulum, causing muscle contraction. Figure 1-5 depicts the chain of events leading to muscle contraction. Muscle contraction is limited to the fibers of a specific motor unit. Muscle contraction is limited to the fibers of a specific motor unit.

However, physiologic work is performed as kilocalories are expended for energy. Maximal force production during an isometric contraction is greater than that seen during a concentric action. However, it is less than maximal eccentric force. Muscle Fiber Types All motor units function in a similar manner. All motor units function in a similar manner. However, motor units may have different contractile and metabolic characteristics. Some motor units are more suited for aerobic activity, while others may be more appropriate for anaerobic activity.

Fiber-subtype transformations occur within a few weeks of training, and by 20 weeks of resistance training most of the Type IIb fibers appear to convert to Type IIa and intermediate fibers, provided that a threshold of volume and intensity are met. Even in subjects that combine both high-intensity resistance and endurance training, similar fiber subtype transformations occur. Interestingly, individuals that perform endurance training tend to not only increase the proportion of Type IIa fibers, but significantly elevate their Type IIc fibers as well.

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