Within skeletal muscle, adaptations to training are specific to the form of muscle contraction. Increased activity with low loads results in increased oxidative metabolic capacity without hypertrophy, increased activity with high loads produces muscle hypertrophy. Increased activity without overload increases capillary and mitochondrial density, myoglobin concentration, and virtually the entire enzymatic machinery for energy production from oxygen (Table 30.6). Coordination of energy-producing and energy-utilizing systems in muscle ensures that even after atrophy the remaining contractile proteins are adequately
^ABLE 30.6^ Effects of Training and Immobilization on the Human Biceps Brachii Muscle in a 22-Year-Old Woman
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Bodybuilding is the process of developing muscle fibers through various techniques. It is achieved through muscle conditioning, weight training, increased calorie intake, and resting your body as it repairs and heals itself, before restarting your workout routine.