SPERM QUALITY

Light from devices at night affects sperm quality

Light from devices at night affects sperm quality

Men might want to think twice before reaching for their smartphone at night. A new study found correlations between electronic media use at night and poor sperm quality.

Preliminary results show that greater self-reported exposure to light-emitting media devices in the evening and after bedtime is associated with a decline in sperm quality.

Sperm concentration, motility and progressive motility — the ability of sperm to “swim” properly — were all lower, and the percentage of immotile sperm that are unable to swim was higher, in men who reported more smartphone and tablet usage at night.

Smartphone and tablet use in the evening and after bedtime was correlated with decline in sperm quality. Furthermore, smartphone use in the evening, tablet use after bedtime, and television use in the evening were all correlated with the decline of sperm concentration,” said principal investigator Amit Green, PhD, head of research and development at the Sleep and Fatigue Institute at the Assuta Medical Center in Tel-Aviv, Israel.

“To the best of our knowledge, this is the first study to report these types of correlations between sperm quality and exposure time to short-wavelength light emitted from digital media, especially smartphones and tablets, in the evening and after bedtime.”

The researchers obtained semen samples from 116 men between the ages of 21 and 59 years who were undergoing fertility evaluation. Participants completed questionnaires about their sleep habits and use of electronic devices.

The study also found a correlation between longer sleep duration and higher sperm total and greater progressive motility. In contrast, greater sleepiness was associated with poorer sperm quality.

The research abstract was published recently in an online supplement of the journal Sleep for Virtual SLEEP 2020. SLEEP is the annual meeting of the Associated Professional Sleep Societies, a joint venture of the American Academy of Sleep Medicine and the Sleep Research Society.

Read more: https://academic.oup.com/sleep/article-abstract/43/Supplement_1/A12/5847498?redirectedFrom=fulltext

Diet has rapid effects on sperm quality

Diet has rapid effects on sperm quality

Diet can influence sperm quality after just a few weeks. This is the conclusion of a study by researchers at Linköping University, in which healthy young men were fed a diet rich in sugar.

The study reinforces the link between nutrition and male reproduction and could have important implications for those undergoing fertility treatment. The study, which has been published in PLOS Biology, gives new insight into the function of sperm, and may in the long term contribute to new diagnostic methods to measure sperm quality.

Sperm quality can be harmed by several environmental and lifestyle factors, of which obesity and related diseases, such as type 2 diabetes, are well-known risk factors for poor sperm quality.

We see that diet influences the motility of the sperm, and we can link the changes to specific molecules in them. Our study has revealed rapid effects that are noticeable after one to two weeks”, says Anita Öst, senior lecturer in the Department of Clinical and Experimental Medicine at Linköping University, and head of the study.

In the study, 15 non-smoking men aged 20-27 followed a specific diet for two weeks. In the first week they ate a healthy diet as recommended by the Nordic Nutrition Recommendations. During the second week, the men ate an extra 375g of sugar per day, which is equivalent to about 3.5 litres of sugary drinks or 450 grammes of confectionery.

The sperm quality and other indicators of the participants’ health were investigated at the start of the study, after the first week (during which they ate a healthy diet), and after the second week (when the participants had additionally consumed large amounts of sugar).

At the beginning of the study, one third of the men had low sperm motility. Motility is one of several factors that influence sperm quality. The researchers were surprised to discover that the sperm motility of all participants became normal during the study.

The study shows that sperm motility can be changed in a short period, and seems to be closely coupled to diet. This has important clinical implications. But we can’t say whether it was the sugar that caused the effect, since it may be a component of the basic healthly diet that has a positive effect on the sperm”, says Anita Öst.

The researchers found that the small RNA fragments, which are linked to sperm motility, also changed. Τhey discovered that tsRNA levels were increased in some of the men after they had eaten a high sugar diet for a week.

They are now planning to continue the work and investigate whether there is a link between male fertility and the RNA fragments in sperm. They will also determine whether the RNA code can be used for new diagnostic methods to measure sperm quality during in vitro fertilisation (IVF). 

Read more: https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3000559

Source: https://liu.se/en/news-item/kosten-har-direkt-paverkan-pa-hur-pigga-spermierna-ar

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