Griffith R O, Dressendorfer R H, Fullbright C D, Wade C E
Phys Sportsmed. 1990 May;18(5):54-64. doi: 10.1080/00913847.1990.11710041.
In brief Exhaustive endurance training may suppress testicular function. This tentative conclusion was drawn from a study of six endurance athletes who underwent 2 weeks of prolonged running and cycling. No significant changes were noted for strength, weight, or body fat. However, persistent fatigue developed in all subjects. Their plasma testosterone decreased 17% (from 673 to 558 ng/dl, p <.05), and sperm count decreased, though not significantly. All reported a decline in sexual activity and sex drive, which may be related to the development of general fatigue and could be an early sign of overtraining stress.
简而言之，高强度耐力训练可能会抑制睾丸功能。这一初步结论是通过对六名耐力运动员进行的一项研究得出的，这些运动员进行了为期两周的长跑和骑自行车训练。力量、体重或体脂方面未发现显著变化。然而，所有受试者都出现了持续疲劳。他们的血浆睾酮水平下降了17%（从673降至558 ng/dl，p<.05），精子数量也有所下降，尽管不显著。所有人都报告说性活动和性欲下降，这可能与全身疲劳的发展有关，并且可能是过度训练压力的早期迹象。
