Question

multiple choice question
exercise training produces a ______ nitrogen balance.

○ negative
○ zero
○ positive

Explanation:

During exercise training, especially when there is muscle growth or repair (like in strength training or endurance training with adequate nutrition), the body retains more nitrogen (from protein) than it excretes. A positive nitrogen balance occurs when nitrogen intake (from protein - containing foods) exceeds nitrogen output (through processes like urine, feces, sweat). Exercise training that stimulates muscle synthesis leads to a positive nitrogen balance as the body is building or maintaining muscle mass, requiring more protein (and thus nitrogen) retention. Negative nitrogen balance is when output exceeds intake (e.g., in starvation or muscle wasting), and zero is when intake equals output (maintenance without growth or loss). So exercise training (with proper nutrition) produces a positive nitrogen balance.

Answer:

C. positive