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    • Seasonal and circadian variation in salivary testosterone in rural Bolivian men 

      Vitzthum, Virginia J; Worthman, Carol M; Beall, Cynthia M; Thornburg, Jonathan; Vargas, Enrique; Villena, Mercedes; Soria Sánchez, Rudy; Cáceres, Esperanza; Spielvogel, Hilde (American Journal of Human Biology, 2009-02-19)
      Abstract. Testosterone (T) plays a key role in the increase and maintenance of muscle mass and bone density in adult men. Life history theory predicts that environmental stress may prompt a reallocation of such investments ...