Help others to be mothers - please sign and share the Progress Educational Trust's petition, calling on the UK Government to #ExtendTheLimit on social egg freezing
Page URL: https://www.bionews.org.uk/page_93988

Sofa so bad: too much TV associated with low sperm counts, says study

11 February 2013
Appeared in BioNews 692

Physical activity is strongly associated with men's sperm quality according to a study looking into the effects of TV viewing and exercise. However, as the study was small and only looked at one point in time, it cannot give a definitive answer as to whether physical activity can improve sperm quality.

'We know very little about how lifestyle may impact semen quality and male fertility in general, so identifying two potentially modifiable factors that appear to have such a big impact on sperm counts is truly exciting', said lead author Audrey Gaskins, a doctoral student at the Harvard School of Public Health.

The study included 189 college students aged 18-22 years old and found that both sperm concentration and total sperm count were related to the time spent watching TV. The men who watched the most TV (more than 20 hours a week) had 44 percent lower sperm concentrations compared to men who didn't watch any TV. Although TV watching hadn't been studied before, another large study has found similar effects of sedentary work on sperm concentration

Exercise had an opposite effect: men who exercised 15 hours a week or more had 73 percent higher sperm concentrations compared to men who exercised less than five hours a week. Meanwhile, the largest study to date – including 2,261 men – found no association between self-reported physical activity and semen quality.

The researchers tried to explain this difference by pointing out that their study included a lot of men who didn't exercise at all. 'We were able to examine a range of physical activity that is more relevant to men in the general population', said Dr Jorge Chavarro, senior author of the study and assistant professor of nutrition and epidemiology at the Harvard School of Public Health.

'The majority of the previous studies on physical activity and semen quality had focused on professional marathon runners and cyclists', said Dr Chavarro. 'These professionals reach physical activity levels that most people in the world cannot match'.

However, as the study was cross-sectional – only studying one point in time – it can't answer the question whether getting off the sofa and onto the treadmill will improve sperm counts. Moreover, sperm count and concentration are only two of the many complex aspects that influence male infertility. Although the study found that physical activity had a statistically significant association with sperm quality, it's not sure whether this translates to a clinically relevant effect.

Writing in the Guardian, Professor Lord Robert Winston said he was not convinced by the findings. 'I doubt that television is the source of the problem, otherwise my own kids, who work day and night in the media, would be sterile', he wrote.

'Nor is it likely to be due to sitting long hours through the evenings on leather couches, otherwise our 92 hereditary peers would surely have died out', he added.

SOURCES & REFERENCES
Active men have higher sperm counts than couch potatoes watching TV
Guardian |  5 February 2013
Physical activity and television watching in relation to semen quality in young men
British Journal of Sports Medicine |  4 February 2013
Prolonged TV viewing linked to lower sperm count
BBC News |  5 February 2013
Sperm count link to exercise still uncertain
NHS Choices |  5 February 2013
TV viewing, exercise habits may significantly affect sperm count
Harvard School of Public Health (press release) |  4 February 2013
Watching TV for too long 'cuts male fertility by half'. Study shows laziness leads to a drop in sperm quality
Mail Online |  5 February 2013
RELATED ARTICLES FROM THE BIONEWS ARCHIVE
30 May 2017 - by Shaoni Bhattacharya 
A giant scanner has been successfully used to sort 'good' sperm from 'bad'...
7 December 2016 - by Dr Marianne Kennedy 
Moderate exercise improves sperm quality and quantity, according to new research...
2 September 2013 - by Dr Shanya Sivakumaran 
Two UK newspapers have proclaimed the fertility-boosting benefits of the raspberry, with NHS Choices branding the claims 'misleading'...
29 April 2013 - by Chris Baldacci 
A study conducted by the University of Southern Denmark has found evidence that suggests men who do not get enough sleep are likely to be less fertile....
18 March 2013 - by Simon Hazelwood-Smith 
Human semen quality may rise and fall in seasonal variation, with the best quality being produced in the winter and spring...
10 December 2012 - by James Brooks 
Between 1989 and 2005, the sperm count of French men dropped by a third, according to research...
19 November 2012 - by Holly Rogers 
A preliminary study from the National Institutes of Health (NIH), USA, suggests that environmental pollutants including industrial chemicals and pesticides may be impairing human fertility, despite being banned more than thirty years ago....
9 July 2012 - by Rosie Beauchamp 
Drinking more than five cups of coffee a day or having a diet with too much saturated fat could adversely affect the chances of success of fertility treatment...
19 March 2012 - by Sarah Pritchard 
Men who consume a diet rich in saturated fat - the type found in junk food - have lower sperm counts than men whose diets contain low levels of such fats, according to scientists...
HAVE YOUR SAY
Log in to add a Comment.

By posting a comment you agree to abide by the BioNews terms and conditions


Syndicate this story - click here to enquire about using this story.