What adaptation occurs in muscle cells due to regular high-rep resistance training?

Regular high-rep resistance training leads to specific adaptations in muscle cells, and one significant adaptation is an increase in the number of mitochondria within those cells. Mitochondria are the energy powerhouses of the cell, responsible for producing adenosine triphosphate (ATP) through aerobic energy metabolism. Higher repetitions usually promote endurance adaptations rather than just building muscle strength or size.

As muscle cells experience regular bouts of high-rep resistance training, they adapt by increasing mitochondrial density, which allows for more efficient energy production during extended periods of exercise. This mitochondrial proliferation enhances aerobic capacity and endurance, enabling muscles to sustain prolonged activities without fatigue.

While increased glycogen storage and enhanced muscle elasticity can be benefits of training, these adaptations do not specifically relate to the unique response driven by high-rep resistance training in the same way. Decreased muscle mass typically occurs through inactivity or negative energy balance, which is contrary to the adaptations meant to be achieved through this type of training. Therefore, the adaptive increase in mitochondria is a clear indication of the body's response to the demands of high-repetition workouts, both in enhancing endurance and improving overall metabolic function within muscle cells.