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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