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Average testis volume (mm3) and relative testis volume (mm3 /100g body weight) of ICR mice (n=20 per group). Testis volume increased in both the enriched exercise and control groups. The male enriched exercise group tended to have larger testis volume and relative volume by normalizing body weight to 100 g at 6 to 9 weeks of age (BW=body weight, rel.=relative volume).
