Physical activity, fatness, educational level and snuff consumption as determinants of semen quality: findings of the ActiART study.
Level 4 - case-series / case-control
Cross-sectional observational study
PubMed 25999214 · doi:10.1016/j.rbmo.2015.03.004
What was done
The ActiART cross-sectional study evaluated 62 men attending an infertility clinic to examine associations between semen quality parameters and physical activity (measured objectively using accelerometry), adiposity (BMI and waist circumference), educational level, and snuff consumption.
What was found
Men with obesity (BMI ≥ 30) and waist circumference ≥ 102 cm had significantly lower semen volume compared with other participants (P < 0.05). Higher values in sperm parameters occurred in participants with university education and those who did not consume snuff (P < 0.05). Men engaging in an average number of 10-minute bouts of moderate-to-vigorous physical activity demonstrated significantly better semen quality than those engaging in low or high numbers of bouts (P < 0.05). No associations were observed for sedentary time or moderate-to-vigorous activity not sustained over 10-minute periods. Numerical point estimates and confidence intervals were not reported in the abstract.
Why it matters
This study suggests that moderate, sustained bouts of physical activity rather than sporadic activity or extreme levels may be optimal for semen quality, while highlighting negative associations with adiposity and snuff use.
Limits
The sample size is very small (n = 62) and limited to a single clinical infertility population, precluding broad generalization. The cross-sectional design cannot establish causality, and specific effect estimates or numerical sperm values were not provided in the abstract.
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