Which effect is associated with human growth hormone (hGH)?

Human growth hormone (hGH) plays a significant role in growth, metabolism, and muscle development. One of the primary physiological effects of hGH is the promotion of lean body mass. It stimulates the growth of muscle tissues and influences protein metabolism, leading to an increase in muscle size and strength. This effect is crucial in various contexts, such as recovery from injury, athletic performance enhancement, and overall physical development.

The increase in lean body mass is attributed to the anabolic effects of hGH, which enhances amino acid uptake by muscle cells, encourages protein synthesis, and stimulates the creation of new muscle fibers. Consequently, individuals with elevated levels of hGH can expect to experience an increase in their muscle mass, contributing to improved physical performance and potentially aiding in weight management.

In contrast, other options may relate to hGH impacts but do not capture the primary and most well-documented effect. While increased muscle strength and increased workload capacity can result from greater lean body mass, they are not direct effects of the hormone itself. Decreased metabolic rate is contrary to the energetic engagement attributed to hGH. Therefore, the association of hGH with increased lean body mass accurately reflects its prominent role in human physiology.