Body Mass Index, Cardiorespiratory Fitness, and Sleep

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Short sleep duration is a major risk factor for weight gain and obesity and has been supported by much evidence from the past studies. Fatigue caused by chronic partial sleep deprivation leads to decreased physical activity and increases the risk for weight gain. Over the past decade many evidences has supported a short sleep duration as a risk factor for weight gain and obesity.1, 2 Sleep deprivation causes feeling of fatigue and lethargy which may lead to decreased physical activity and may also have a neurohormonal effect that increases calorie intake. Increase in calorie intake may also be seen because of the neurohormonal effect of sleep deprivation which again contributing to weight gain. Decreased glucose tolerance which is a risk factor for obesity has also been linked to disturbed sleep pattern.3 For the last few years decline in sleep duration has grown to be a hallmark of modernday society among the children as well as in adults. Both are having shorter sleep duration with average sleep duration of 7 hours per night and one-third sleeping less than 7 hours per night.4, 5 Televisions and smartphones which came into households as remarkable source of information and entertainment has robbed sleep time and voluntary sleep restriction