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Testosterone levels decline as men age, but how often this decrease produces symptoms that are correctable by testosterone supplementation is unclear. Several studies and guidelines published in 2010 shed some light on these questions but also leave many questions unresolved.
Do testosterone levels affect physical performance? A cross-sectional longitudinal analysis of 1445 men from the Framingham Offspring Study showed that men with repeatedly higher free testosterone levels had better physical performance scores and walking speed and lower risk for poor subjective health than men with lower levels. Men with low baseline free testosterone levels were more likely to report mobility limitations, but no clear correlation was established betwee…