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Table 3 Levels of risk based on physical activity volume and intensity

From: Sport, doping and male fertility

Volume (hours/week) and intensity Level of Risk
+ 30 h training or racing/weeks including moderate and high intensity [137] Very high risk
20–30 h training or racing/weeks including moderate and high intensity [138] High risk
10–20 h training or racing/weeks including moderate and high intensity [57, 139] Medium risk
5–15 h training or racing/weeks not including moderate and high intensity [140,141,142] Low risk
Less than 5 h training or racing/weeks not including moderate and high intensity [143, 144] Very low risk