Which skeletal muscle adaptation is characteristic of endurance training rather than resistance training?

• A Increased capillary density and mitochondrial enzyme activity ✓
• B Increased cross-sectional area of type II fibers
• C Increased glycolytic enzyme concentration
• D Conversion of type I fibers into type II fibers

Explanation

Endurance training produces increased capillary density, mitochondrial number, and oxidative enzymes such as succinate dehydrogenase, improving fat oxidation and fatigue resistance. Resistance training instead causes fiber hypertrophy, especially of type II fibers, and raises glycolytic enzyme levels. Fiber type conversion between slow and fast categories does not occur with ordinary training; only modest shifts within subtypes are described.

Reference: Ganong's Review of Medical Physiology, 26th ed.

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