|Run, Forrest, run!!!|
Walking and running are the most popular physical activities for American adults. But whether one is preferable to the other in terms of improving health has long been debated.
Why running should better aid weight management than walking is not altogether clear. It might seem obvious that running, being more strenuous then walking, burns more calories per hour. And that’s true. But in the Berkeley study and others, when energy expenditure was approximately matched — when walkers head out for hours of rambling and burn the same number of calories over the course of a week as runners — the runners seem able to control their weight better over the long term.
One reason may be running’s effect on appetite, as another intriguing, if small, study suggests. In the study, published last year in the Journal of Obesity, nine experienced female runners and 10 committed female walkers reported to the exercise physiology lab at the University of Wyoming on two separate occasions. On one day, the groups ran or walked on a treadmill for an hour. On the second day, they all rested for an hour. Throughout each session, researchers monitored their total energy expenditure. They also drew blood from their volunteers to check for levels of certain hormones related to appetite.
After both sessions, the volunteers were set free in a room with a laden buffet and told to eat at will.
The walkers turned out to be hungry, consuming about 50 calories more than they had burned during their hourlong treadmill stroll.
The runners, on the other hand, picked at their food, taking in almost 200 calories less than they had burned while running.
And in perhaps the most comforting of the new studies, published last month in Arteriosclerosis, Thrombosis and Vascular Biology and again using numbers from the versatile Runners and Walkers Health Study, runners had far less risk of high blood pressure, unhealthy cholesterol profiles, diabetes and heart disease than their sedentary peers. But the walkers were doing even better. Runners, for instance, reduced their risk of heart disease by about 4.5 percent if they ran an hour a day. Walkers who expended the same amount of energy per day reduced their risk of heart disease by more than 9 percent.
… researchers combed (尋找,這邊不是梳頭髮喔)survey data from 15,237 walkers and 32,215 runners enrolled in the National Runners and Walkers Health Study — a large survey being conducted at Lawrence Berkeley National Laboratory in Berkeley, Calif.