Intense Exercise Chills Appetite For 24 Hours
Another thing that short bursts of intense exercise are good for: eating less. Gretchen Reynolds reports in the New York Times on research conducted at the University of Western Australia that measured the appetites of 17 young men who, on different days, undertook four different activities. On some days the men rested, reading books; on other days they did 30 minutes of moderate exercise on a bike; and on other days they did 30 minutes of intervals, riding first for one minute at 100 percent of their capacity, then spinning gently for 4 minutes. Finally, there were days when the men strained through 15 seconds of pedaling at 170 percent of their normal endurance capacity, then pedaled at barely 30 percent of their maximum capacity for a minute, then repeated the exercise for 30 minutes. The researchers measured the appetites of the men in two ways: they checked the levels of ghrelin, a hormone that stimulates appetite, and more reliably, they gave them food. Reynolds reports that the appetites of the men who did interval workouts were clearly blunted by each of the interval workouts, and they were more blunted by the most strenuous 15-second intervals. The intense workout men had significantly lower levels of ghrelin, and they had elevated levels of both blood lactate and blood sugar, which have been shown to lessen the drive to eat. Wait, there’s more: the appetite-suppressing effect of the highly intense intervals lingered into the next day. Read more in the New York Times.