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Table 4 Training Intensity for amateur athletes [143, 145,146,147]

From: Sport, doping and male fertility

Intensity % Heart rate Reserve (HRR) or % oxygen uptake reserve (VO2R) % Heart rate (HR) max % maximum oxygen uptake (VO2max)
Very low <  30 <  57 <  37
Low 30–39 57–63 37–45
Moderate 40–59 64–76 46–63
High 60–89 77–95 64–90
Very High (Elite training) >  90 >  96 >  91