No one including you, Ronny, has mentioned intensity. As you get older, you lose lean muscle mass. Aerobic exercise is not enough to stimulate muscle fibre growth, only to maintain what you have, in effect slightly slowing the decline. However, if you exercise anerobically, either within the context of your running, or with strength/resistance training, you can halt the slide. If you are already including eg hard hill reps, short fast intervals (very short, very fast!), or weights or circuit training then fine. If you are exercising aerobically then more aerobic will not make a lot of difference. Second, and also not mentioned in the posts above, is the amount of carbs you eat. Regualr high-carb intake = regular bursts of insulin, = a tendency to not gain lean muscle mass. So adding calories is ok, but adding them in the form of fat and protein is crucial to maintain insulin sensitivity, which in turn is crucial in promoting muscle growth.
Huw, www.runflux.com for your daily dose of running.
Posted: 01/11/2007 at 16:35