Teens who slept less than eight hours on weeknights consumed 2.2 percent more calories from fats and 3 percent fewer calories from carbs than teens who slept eight hours or more, according to new research. In secondary analyses stratified by sex, the results were significant among girls but not boys.

In 2009, a study was conducted in the UK to assess the effects of running in ultra-endurance races. Typically aimed at super-fit and experienced athletes, these races are held over distances exceeding 50 miles (80 kilometres)

In a study aimed at understanding the effect of prolonged exercise on the heart, researchers in Sweden studied a group of competitors taking part in the Adventure Racing World Championship. The results show no evidence of cardiac fatigue despite the fact that this is a continuous endurance event lasting between five and seven days.

A year-long study into the effects of increased physical activity at school has shown that children’s fitness levels and body composition do improve with daily participation in sport – and particularly so for children from deprived backgrounds.

Here’s good news for anyone trying to lose weight or has osteoporosis: Scientists are on the trail of a weight loss drug that may revolutionize how we treat these two conditions. Researchers have discovered a new protein, called “Sprouty,” responsible for regulating body fat and bone mass.

A study of triathletes reveals that the heart adapts to triathlon training by working more efficiently.

For competitive bicyclists with goals — whether competing in the Tour de France or aiming for the podium at a local race — faster cycling comes from training regimens based on various zones of exercise intensity. New research from exercise scientists has found that effective training regimens, which generally are created after expensive, time-consuming laboratory tests, can be developed from a relatively simple, do-it-yourself test.

A group of “professional couch potatoes,” as one researcher described them, has proven that even moderate exercise — in this case walking at one’s own pace for 40 minutes three times a week — can enhance the connectivity of important brain circuits, combat declines in brain function associated with aging and increase performance on cognitive tasks.

Taking a dietary supplement to boost nitric oxide in the body can significantly boost stamina during high-intensity exercise. The study has important implications for athletes, as results suggest that taking the supplement can allow people to exercise up to 20 percent longer and could produce a 1-2 percent improvement in race times.

There is now another good reason to exercise.