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  • People who slept 5-6 hours per night gained 4.4 pounds more during six-year study


    Posted by .(JavaScript must be enabled to view this email address)
    Wednesday, November 03, 2010 9:55 am Email this article
    People who slept only 5-6 hours per night, and those who slept 9-10 hours per night gained 3-4 pounds more over a six year period of time than those who slept an average of 7-8 hours per night according to a study from researchers at Laval University in Quebec, Canada. "These results emphasize the need to add sleep duration to the list of environmental factors that are prevalent in our society and that may contribute to the obesity epidemic," the authors concluded.
    Subjects

    Subjects : 276 adults, 21-64 years-old

    The study involved 276 adults who were 21-64 years-old from the Quebec Family Study.

     

    Short Sleep Duration

    Short sleep duration, 5-6 hours per night, gained 4.4 lbs more ; 8.8 lbs vs 4.4 lbs

    People who slept only 5-6 hours a night gained an average of 4.4 pounds more than those who slept an average of 7-8 hours per night over the six-year study.

    People who slept only 5-6 hours a night gained an average of approximately 8.8 pounds versus 4.4 pounds for those who slept an average of 7-8 hours per night.

    ( I used the word “approximate” because I had to calculated this from a graph. )

    Short sleep duration, 5-6 hours per night, 35% more likely to gain 11 lbs

    Those sleeping only 5-6 hours per night were 35% more likely to experience an 11 pound weight gain compared with people who slept an average of 7-8 hours per night.

    Short sleep duration, 5-6 hours per night, 27% more likely to develop obesity

    Those sleeping only 5-6 hours per night were 27% more likely to develop obesity during a six-year study compared to those who slept an average of 7-8 hours per night, and those who slept 9-10 hours per night were 21% more likely to develop obesity during the study.

     

    Long Sleep Duration

    Long sleep duration, 9-10 hours per night, gained 3.5 lbs more

    People who slept 9-10 hours a night gained 3.5 pounds more than people who slept an average of 7-8 hours per night, an average weight of approximately 7.9 pounds versus 4.4 pounds.

    Long sleep duration, 9-10 hours per night, 25% more likely to gain 11 lbs

    Those sleeping 9-10 hours per night were 25% more likely to experience and 11 pound weight gain compared with people slept an average of 7-8 hours per night.

     

    Risk of Obesity

    Long sleep duration, 9-10 hours per night, 27% more likely to develop obesity

    Those sleeping only 9-10 hours per night were 21% more likely to develop obesity during the study compared to those who slept an average of 7-8 hours per night.

     

    Short Sleepers Heavier at the Start of the Study

    Short sleepers were heavier at the start of the study : 169.2 lbs vs 152.5 lbs vs 159.3

    It is also worth noting that those who only slept 5-6 hours per night were heavier when the study began, weighing an average of 169.2 pounds compared to an average of 152.5 for those sleeping 7-8 hours per night, and 159.3 pounds for those sleeping 9-10 hours per night.

    Short sleepers were heavier at the start of the study : BMI of 27.8 vs 25 vs 26.1

    The average body mass index of those sleeping 5-6 hours per night was 27.8 ( overweight ) versus 25.0 ( normal weight ) for those sleeping 7-8 hours per night, and 26.1 ( overweight ) for those sleeping 9-10 hours per night.

     

    Conclusion

    Conclusion : Short sleep duration or long sleep duration increase the risk of weight gain

    “This study provides evidence that both short and long sleeping times predict an increased risk of future body weight and fat gain in adults,” the authors of the study concluded.

    REFERENCE

    Chaput J-P, Després J-P, Bouchard C, Tremblay A. The association between sleep duration and weight gain in adults: A 6-year prospective study from the quebec family study. Sleep. 2008 Apr 1, 31(4):517-23.

    AUTHOR’S CONTACT INFORMATION

    Angelo Tremblay, PhD
    Division of Kinesiology (PEPS)
    Department of Social and Preventive Medicine
    Laval University
    Quebec City, Quebec, Canada, G1K 7P4
    (418) 656-7294 phone
    (418) 656-3044 fax
    .(JavaScript must be enabled to view this email address)

     

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