After an hour in the gym you’re feeling pretty good about yourself. Less so two hours later, when you’ve demolished half the fridge. But the relationship between exercise and weight loss is complicated: not all exercise stimulates appetite to the same extent. And individuals vary in how much weight they lose from exercise.
This latest research, a small study of 16 healthy young men, measured the effects of different types of exercise on levels of acylated ghrelin, a hormone in the blood that is thought to increase appetite. The researchers provided standardised meals after the exercise and asked the men to rate their hunger levels. The study showed that the more intense and long the exercise, the more the levels of acylated ghrelin were suppressed. Those who ran for 90 minutes still had lower levels an hour after exercise. They also felt less hungry for longer. Shorter, more intense workouts reduced hormone levels more than easy jogging but the men still felt peckish a bit earlier than those who ran for longer.
Prof David Stensel of the School of Sport, Exercise and Health Sciences at Loughborough University, one of the authors of the study, says that their previous work does not show that people overcompensate in how much they eat after exercise. It’s a difficult area to research as, unless you directly watch what people do, you have to rely on them self-reporting the length and intensity of their exercise and how much they ate – not always accurately.
Excerpt from The Guardian, read the full story here