Male fertility problems 'may arise due to frequent sex'

Washington, December 5 (ANI): Some fertility problems may arise because men simply have intercourse too frequently, researchers say.

An increasing number of men suffer from fertility problems, especially in western society and the general belief is that many problems may be related to stress.

Fertility tests frequently reveal that males have problems with the quality of their sperm.

The problems often relate to sperm senescence, which is a reduction in quality with age. Sperm senescence can arise either before or after the DNA in the sperm cells is produced by a process known as meiosis.

So-called "pre-meiotic" senescence results from accumulated damage in the germline cells with increasing age and results in older males having sperm of lower quality.

Post-meiotic senescence occurs after the sperm cells have been produced, either during storage of sperm by the male or after ejaculation and before they fertilize the eggs.

There is previous evidence that various kinds of sperm senescence occur in insects, in some domestic animals - birds and mammals - and even in humans but the studies have generally been carried out under fairly artificial conditions and so it is not clear how they relate to wild animals - or to the general human population.

These objections have been overcome in the latest work of Attila Hettyey and colleagues at the Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Vienna (Vetmeduni), together with Balazs Vagi in Budapest, Hungary, where Hettyey himself is now working.

The researchers investigated the common toad, an interesting model system as it is known to produce all its sperm before the start of the breeding season.

They found that male toads that re-entered hibernation at the start of the breeding season, i.e. that lowered their metabolic rates after producing sperm, stored sperm of significantly higher motility than males kept under pseudo-natural conditions without females throughout the entire breeding season.

The result means that slowing the normal rate of general physiological processes reduced the normal rate of sperm ageing within the toad's testicles. This constitutes the first evidence for post-meiotic intra-testicular sperm senescence in a wild vertebrate.

A further surprising result was that in males kept under pseudo-natural conditions, sperm motility was related to the number of matings a male achieved, with the presence of females or the occurrence of matings having a positive effect on the quality of stored sperm.

This suggests that post-meiotic intra-testicular sperm senescence does not occur at a fixed rate but may be modulated by external factors, such as temperature and number of matings.

In summary, the scientists at the Vetmeduni have shown that sperm senescence occurs while sperm are stored in the testicles of animals living under essentially "natural" conditions.

They also suggest that the rate of sperm senescence can be slowed if males mate more frequently. For animals that produce sperm continuously, such as man, the implications seem to be that more frequent ejaculations serve both to remove older and thus less viable sperm as well as to reduce the damage to sperm cells during storage.

The study has been published in the international online journal PLoS ONE. (ANI)

Matches

MORE TOP STORIES TODAY

Jadeja spins out Rajasthan in close chase

Jadeja spins out Rajasthan in close chase

IPL 7, GAME 10—Chennai beat Rajasthan by 7 runs after last-over scare. More »

Cleaning up the game starts with fans

Cleaning up the game starts with fans

... because, as recent events reveal, the BCCI has little intention of doing it. More »

Hope to be fit for next game - Kevin Pietersen

Hope to be fit for next game - Kevin Pietersen

With two heavy defeats at the hands of Bangalore and Chennai, Daredevils currently languish near the bottom of the table. More »

Chandimal axed as T20 captain, Malinga takes over

Chandimal axed as T20 captain, Malinga takes over

Sri Lanka's cricket selectors on Wednesday sacked Dinesh Chandimal as Twenty20 captain and replaced him with Lasith Malinga, while Angelo Mathews was… More »

'A blow to BCCI, could hurt autonomous status'

'A blow to BCCI, could hurt autonomous status'

The Supreme Court prefers that the Justice Mudgal panel further investigate the IPL corruption scandal. More »

Have the ECB played an unfair game?

Have the ECB played an unfair game?

Money talks, but it is in light of this ICC shakeup that the ECB's act of soliciting of another team's coach deteriorates from free-market aggression to… More »

Perfect Punjab trounce Hyderabad

Perfect Punjab trounce Hyderabad

IPL7, GAME 9—Maxwell (95, 43b), Balaji (4-13) set up 72-run win. More »

Mudgal panel drops bombshell in court

Mudgal panel drops bombshell in court

The Mukul Mudgal probe committee dropped a bombshell in the Supreme Court on Tuesday by making a sensational claim that it was forced to stop audio recording… More »

Farbrace quits for England post

Farbrace quits for England post

He will assist Peter Moores who was unveiled as the new England coach on Saturday. More »

Moin appointed to manage Pakistan team

Moin appointed to manage Pakistan team

Pakistan on Monday reappointed Moin Khan as chief selector and manager of the national team, a week after fellow former captain Rashid Latif turned down… More »

Chennai smash Delhi for first win

Chennai smash Delhi for first win

IPL7, MATCH 8—Raina-led middle order, superlative catching give CSK a 93-run win. More »

SC asks Mudgal committee to continue

SC asks Mudgal committee to continue

Mukul Mudgal has communicated to the court his willingness to take up the investigation and has been asked to specify the terms and modalities on April… More »

'BCCI reputation lowest in 80 years'

'BCCI reputation lowest in 80 years'

The former BCCI president says he was "disillusioned" by the happenings at the emergent working committee meeting on Sunday. More »

Injured Bravo to miss rest of IPL

Injured Bravo to miss rest of IPL

Dwayne Bravo is set to be sidelined for at least four weeks due to a shoulder problem. Bravo sustained the injury when attempting a catch on the boundary… More »

NZC contemplates domestic revamp

NZC contemplates domestic revamp

New Zealand Cricket has put forward a proposal to reinvent its domestic structure and allow up to 49% private investment into the six major associatio… More »

Punjab pull off another big chase

Punjab pull off another big chase

GAME 7, SHARJAH—Maxwell, Miller, Pujara chase down Rajasthan's 192. More »

T20 test for Cheteshwar Pujara

T20 test for Cheteshwar Pujara

The class act from Saurashtra may have to rethink his approach to the mannerless format. More »

Special meeting to replace Srinivasan

Special meeting to replace Srinivasan

The BCCI is likely to convene a special general body meeting (SGM) in May to replace N Srinivasan on the board's disciplinary committee. More »

Roach escapes injury after car crash

Roach escapes injury after car crash

The West Indies fast bowler lost control of his BMW sedan due to slippery road conditions in his native Barbados on Saturday. More »

Shastri in proposed IPL probe panel

Shastri in proposed IPL probe panel

Some members stressed on the need for proposing names with an "impeccable record and clean image". More »

Day of Supreme reckoning

Day of Supreme reckoning

Apex court to decide on BCCI’s proposed new committee today. More »

Panel can help clean mess: Raghavan

Panel can help clean mess: Raghavan

The former CBI Director is one of the three candidates proposed by the BCCI to head the enquiry into the IPL betting and spot-fixing scandal. More »

Repose faith in Indian coaches

Repose faith in Indian coaches

All of them cost plenty of dollars which I feel is unnecessary for a two- month tournament, says former cricketer Yajurvindra Singh. More »

Cook relieved after period in limbo

Cook relieved after period in limbo

The England captain is looking forward to a fresh start after a dispiriting Ashes defeat last year. More »