If you want to see serious improvements in your fitness level, you have to push your body to the limit – then do it again. The processes that makes your muscles feel sore also strengthens them and being winded trains your body to better conserve oxygen. Though pushing your physical boundaries is healthly, pushing them too far can be dangerous and debilitating. The key is to know when you're overdoing it.
Dr. Christopher Kaeding, professor of orthopedics at Ohio State University and head team physician for the Buckeyes offers some insight.
Change in Sleep Habits
In most cases, exercise can help regulate our sleep cycle. Being active during the day can help us rest easier at night. If you're overtraining, the opposite may occur. Pushing your body too hard can cause insomnia or oversleeping. A recent study of 27 male triathletes found that those who were put in the overload training group slept for less time and less efficiently than those in the regular workout group. Their sleep habits returned to normal as their workouts tapered off.
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