More or less than six to eight hours sleep a night could be bad for health

The Borneo Post - Nature and health - - Vital Signs -

NEW RE­SEARCH pre­sented at the Euro­pean So­ci­ety of Car­di­ol­ogy (ESC) Congress has sug­gested that around six to eight hours sleep a night could be ideal for main­tain­ing good health, with more or less shut-eye ap­pear­ing to have a neg­a­tive ef­fect on well-be­ing. In the first of three stud­ies pre­sented at the event, re­searchers at the Onas­sis Car­diac Surgery Cen­tre, Greece, car­ried out a meta-anal­y­sis to in­ves­ti­gate the re­la­tion­ship be­tween sleep du­ra­tion and risk of car­dio­vas­cu­lar dis­ease (CVD), look­ing at 11 stud­ies with a to­tal of 1,000,541 adults with­out CVD.

They found that com­pared to those who slept six to eight hours a night, short sleep­ers who slept less than six hours per night had an 11 per cent in­creased risk of devel­op­ing or dy­ing from coro­nary artery dis­ease or stroke dur­ing an av­er­age fol­low-up of 9.3 years. For long sleep­ers, de­fined as those who slept more than eight hours per night, this num­ber rose to a 33 per cent in­creased risk.

“Our find­ings sug­gest that too much or too lit­tle sleep may be bad for the heart,” said study au­thor Dr Epameinon­das Foun­tas. “More re­search is needed to clar­ify ex­actly why, but we do know that sleep in­flu­ences bi­o­log­i­cal pro­cesses like glu­cose me­tab­o­lism, blood pres­sure, and in­flam­ma­tion -- all of which have an im­pact on car­dio­vas­cu­lar dis­ease.”

“Hav­ing the odd short night or lie-in is un­likely to be detri­men­tal to health, but ev­i­dence is ac­cu­mu­lat­ing that pro­longed nightly sleep de­pri­va­tion or ex­ces­sive sleep­ing should be avoided,” added Dr Foun­tas. “Get­ting the right amount of sleep is an im­por­tant part of a healthy life­style.” Re­search from the Span­ish Na­tional Cen­tre for Car­dio­vas­cu­lar Re­search (CNIC) in Madrid, which was also pre­sented at the congress, adds to the ev­i­dence that too lit­tle sleep may have a neg­a­tive ef­fect on health.

Af­ter record­ing the sleep of 3,974 healthy mid­dle-aged adults over a seven-day pe­riod, the re­searchers found that those who sleep less than six hours a night or wake up sev­eral times in the night have an in­creased risk of asymp­to­matic ath­er­o­scle­ro­sis, which hard­ens and nar­rows the ar­ter­ies, than those who sleep seven to eight hours a night or wake up less of­ten.

Those who had short or dis­rupted sleep were also more likely to have meta­bolic syn­drome, a col­lec­tion of con­di­tions in­clud­ing high blood su­gar, high blood pres­sure, and obe­sity, which can in­crease the risk of heart dis­ease, stroke, and di­a­betes. Find­ings pre­sented by the Univer­sity of Gothen­burg, Swe­den also found that mid­dle-aged men who slept less than five hours a night had twice the risk of a ma­jor car­dio­vas­cu­lar event dur­ing the study’s 21-year fol­low-up than men who sleep seven to eight


In ad­di­tion, high blood pres­sure, di­a­betes, obe­sity, smok­ing, low phys­i­cal ac­tiv­ity, and poor sleep qual­ity were also more com­mon in men who slept five or less per night com­pared with those who got seven to eight hours. – Re­laxnews

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