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.
Strength training also improves your running form and helps you prevent injury. When you repetitively use the same muscles over and over, as you do in running, the muscles you don't use repetitively get weaker. This can lead to muscle imbalances that leave you vulnerable to injury.