The recorded sex sessions lasted for an average of Men expended more energy getting busy than women, even after controlling for men's greater body mass. Using a wearable armband called SenseWear, University of Quebec at Montreal researchers tracked the energy expenditures of couples as they had sex in their homes. Man-on-top sex increased it by 51 percent. For comparison, between 85 and beats per minute count as moderate-intensity exercise for a year-old. That intensity is moderate, the researchers reported online Oct. In , a study of 10 intrepid married couples published in the journal Archives of Internal Medicine used heart rate and blood pressure monitoring, a fast-responding oxygen gas analyzer and electrocardiography to determine that, for men, self-stimulation increased heart rate by 37 percent. In other words, sex is better exercise than a walk, but not quite as good as a jog.
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