As a response to a progressive resistance training program, which of the following demonstrates the predominant contribution to an increase in cross-sectional area of a muscle?

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Hypertrophy is the predominant contribution to an increase in cross-sectional area of a muscle in response to a progressive resistance training program. While there is some evidence to suggest that hyperplasia (an increase in the number of muscle fibers) may also occur, it is generally considered to be a minor contributor compared to hypertrophy. Atrophy, the decrease in muscle mass due to disuse or aging, would be the opposite of the desired response to a training program. However, it is possible for a muscle to initially undergo some degree of atrophy before hypertrophy occurs, particularly if the individual was previously sedentary or had undergone a period of detraining.

As a Response to a Progressive Resistance Training Program, Which