Which performance-enhancing substance is most likely to increase lean body mass?

Which performance-enhancing substance is most likely to increase lean body mass?

• A. Anabolic steroids
• B. Arginine
• C. Ephedrine
• D. Beta-alanine

Answer: (A)

The main idea here is that increasing lean body mass comes from creating a strong net positive in muscle protein balance, meaning muscle protein synthesis exceeds breakdown, especially when combined with resistance training. Anabolic steroids produce the largest, most direct push toward that outcome. They are synthetic derivatives of testosterone that bind to androgen receptors in muscle cells, driving increased transcription of muscle proteins, promoting satellite cell activation, and reducing protein breakdown. This combination leads to greater muscle fiber size and overall lean mass, often with improved recovery and training capacity. The other substances don’t produce the same robust effect on muscle growth. Arginine mainly boosts nitric oxide and blood flow, which can help with nutrient delivery but doesn’t reliably drive substantial muscle gains. Ephedrine is a stimulant that can raise energy expenditure and may aid some weight loss, not a primary driver of lean mass. Beta-alanine enhances performance by buffering acid in high-intensity efforts, which can support training volume, but it doesn’t directly cause significant increases in lean mass. So, for increasing lean body mass, anabolic steroids are the best-supported option among those choices.

The main idea here is that increasing lean body mass comes from creating a strong net positive in muscle protein balance, meaning muscle protein synthesis exceeds breakdown, especially when combined with resistance training. Anabolic steroids produce the largest, most direct push toward that outcome. They are synthetic derivatives of testosterone that bind to androgen receptors in muscle cells, driving increased transcription of muscle proteins, promoting satellite cell activation, and reducing protein breakdown. This combination leads to greater muscle fiber size and overall lean mass, often with improved recovery and training capacity.

The other substances don’t produce the same robust effect on muscle growth. Arginine mainly boosts nitric oxide and blood flow, which can help with nutrient delivery but doesn’t reliably drive substantial muscle gains. Ephedrine is a stimulant that can raise energy expenditure and may aid some weight loss, not a primary driver of lean mass. Beta-alanine enhances performance by buffering acid in high-intensity efforts, which can support training volume, but it doesn’t directly cause significant increases in lean mass.

So, for increasing lean body mass, anabolic steroids are the best-supported option among those choices.