All of the following may happen in response to exercise...

All of the following may happen in response to exercise training except:
a. increase in the number of myofibrils
b. increase in the storage of glycogen and creatine phosphate
c. increase in the number of muscle fibers
d. increase in the number of mitochondria

Key Concepts

Muscle Hypertrophy

Muscle hypertrophy refers to the increase in the size of existing muscle fibers. This process involves enhancements such as the synthesis of additional myofibrils and an increase in the muscle’s contractile proteins, which lead to greater force production and overall muscle mass. It is the primary adaptation in response to resistance and endurance training in adult muscles.

Muscle Hyperplasia

Muscle hyperplasia is the process of increasing the number of muscle fibers rather than the size of each fiber. In humans, this adaptation is generally not observed with regular exercise training; instead, improvements in muscle function and strength are primarily attributed to hypertrophy. The concept of hyperplasia remains controversial in the context of exercise physiology.

Mitochondrial Biogenesis

Mitochondrial biogenesis is the process by which new mitochondria are formed within the cell. This adaptation is a common response to aerobic training, enhancing the muscle’s oxidative capacity and endurance by increasing the number and efficiency of mitochondria, which are essential for energy production during prolonged physical activity.

Energy Storage Adaptations

Energy storage adaptations in muscles involve an increase in the storage capacity of energy substrates like glycogen and creatine phosphate. These adaptations help improve exercise performance by ensuring that muscles have rapid access to the necessary fuels during high-intensity or prolonged exercise, enabling better endurance and recovery.

Myofibrillar Adaptations

Myofibrillar adaptations refer to the increased synthesis and organization of myofibrils, the contractile units within muscle fibers. An increase in myofibrils contributes to stronger and more efficient muscle contractions during exercise, which is a key aspect of muscle hypertrophy and improved athletic performance.

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