Chapter 6: Training for Strength 133 and various metabolic enzymes) and noncontractile proteins. Myofibrillar hypertrophy is characterized by an increased number of myofibrils as well as actin and myosin filaments. Although heavy strength training will lead to both sarcoplasmic and myofibrillar hypertrophy, Olympic weightlifting and powerlifting tend to promote more myofibrillar hypertrophy; whereas, bodybuilding tends to promote more sarcoplasmic hypertrophy. Figure 6.7 depicts the anatomy of skeletal muscle. Figure 6.8 depicts the differences between sarcoplasmic and myofibrillar hypertrophy within a muscle fiber. Figure 6.7. Anatomy of Skeletal Muscle Figure 6.8. Sarcoplasmic vs. Myofibrillar Hypertrophy
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