美國(guó)一項(xiàng)研究顯示,，每周騎自行車?yán)塾?jì)超過5小時(shí)可能對(duì)男性精子數(shù)量和質(zhì)量產(chǎn)生負(fù)面影響,。
2200名男性參與這項(xiàng)調(diào)查研究,。他們每人提供了一份精液樣本并陳述日常健康與運(yùn)動(dòng)狀況。在排除營(yíng)養(yǎng)水平,、體重,、血壓、內(nèi)褲款式等其他因素后,，研究者得出結(jié)論,，每周騎自行車時(shí)間累計(jì)超過5小時(shí)的男性相比其他男性，精子數(shù)量和精子活性都有所下降,。
數(shù)據(jù)顯示,，在缺少鍛煉的男性群體中，23%的人精子數(shù)量偏低,；而每周騎車超過5個(gè)小時(shí)的“騎車男”群體中,，這一數(shù)值升至31%。另外,，40%的“騎車男”精子活性不足,，同樣高于不運(yùn)動(dòng)男性。
引導(dǎo)這項(xiàng)研究的美國(guó)波士頓大學(xué)副教授勞拉·懷斯說,，陰囊受傷或陰囊部位升溫或可解釋騎車與精子健康度下降之間的關(guān)聯(lián),。
此項(xiàng)研究還顯示，相比少鍛煉男性,，經(jīng)常鍛煉以及高強(qiáng)度鍛煉的男性在精子數(shù)量和精子活力上出現(xiàn)問題的幾率要低,。
懷斯向路透社記者解釋研究目的時(shí)說，以前針對(duì)競(jìng)技運(yùn)動(dòng)員的研究顯示自行車運(yùn)動(dòng)對(duì)泌尿系統(tǒng)和精液質(zhì)量有影響,，“但是在日常鍛煉男性中,，我們不確定是否能找到這種關(guān)聯(lián)”。
不過,，懷斯承認(rèn),，接受調(diào)查的男性全部來自男科診所，調(diào)查結(jié)果可能因此而不具備普遍性,，最終結(jié)果仍需獲得更多研究認(rèn)證,。（生物谷Bioon.com）
生物谷推薦原文出處：
Fertility and Sterility doi:10.1016/j.fertnstert.2010.11.006
Physical activity and semen quality among men attending an infertility clinic
Objective
To examine the association between regular physical activity and semen quality.
Design
Prospective cohort study.
Setting
Couples attending one of three IVF clinics in the greater Boston area during 1993–2003. At study entry, male participants completed a questionnaire about their general health, medical history, and physical activity. Odds ratios (ORs) and 95% confidence intervals (CIs) were derived using generalized estimating equations models, accounting for potential confounders and multiple samples per man.
Patient(s)
A total of 2,261 men contributing 4,565 fresh semen samples were enrolled before undergoing their first IVF cycles.
Intervention(s)
None.
Main Outcome Measure(s)
Semen volume, sperm concentration, sperm motility, sperm morphology, and total motile sperm (TMS).
Result(s)
Overall, none of the semen parameters were materially associated with regular exercise. Compared with no regular exercise, bicycling ≥5 h/wk was associated with low sperm concentration (OR 1.92, 95% CI 1.03–3.56) and low TMS (OR 2.05, 95% CI 1.19–3.56). These associations did not vary appreciably by age, body mass index, or history of male factor infertility.
Conclusion(s)
Although the present study suggests no overall association between regular physical activity and semen quality, bicycling ≥5 h/wk was associated with lower sperm concentration and TMS.
Key Words: Physical activity, bicycling, sperm motility, sperm count, male infertility, IVF
