The cause is frequently unknown. Hypertrophic cardiomyopathy is often and dilated cardiomyopathy in a third of cases, is inherited from a person's parents. Dilated cardiomyopathy may also result from alcohol, heavy metals, coronary heart disease, cocaine use, and viral infections.
Consider the number of reps. You can also confuse your muscles by increasing or decreasing the number of repetitions you do during any given exercise. For example, if you normally do 12 repetitions, do 15 or 18 repetitions, but with a lower weight than you would normally use.
If you're not careful, by the time you're 65, it's possible to have lost half of your muscle mass and see your metabolism slowed by 200 to 300 calories. More from Prevention: 8 Effective Exercises You're Not Doing. [pagebreak]Firm and burn! To keep your metabolism chugging in high gear, you need strength training. If you work your major muscle groups twice a week, you can expect to replace 5 to 10 years' worth of muscle loss in just a few months.