Is SHBG useful for Sport?

Whether SHBG (sex hormone-binding globulin) is useful for sport cannot be directly answered from the provided context. Generally, SHBG regulates the bioavailability of testosterone and estradiol. In sports, free (unbound) testosterone is often considered relevant for muscle growth and recovery. Low SHBG may increase free testosterone, potentially enhancing performance short-term, but is also linked to metabolic risks like insulin resistance. High SHBG reduces free testosterone, possibly limiting anabolic effects. However, SHBG itself is not a direct performance marker; it is influenced by diet, insulin, thyroid hormones, and inflammation. The evidence for routine SHBG testing in sport is moderate – it can be useful as part of a comprehensive hormone panel, but not as a standalone indicator. Limitations of consumer lab tests (e.g., MyBody-X) include lack of clinical validation for athletes. Safety note: hormonal interpretations should always be done by a physician.