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.
Muscle weakness/inhibition, is a shut down muscle that is receiving no, or distorted, neurological input. Muscular inhibition creates a situation of joint instability. Muscles tighten up to protect joint due to instability. Compensatory patterns develop causing joint limitation, misalignment inappropriate and distorted movement patterns. If left untreated it will become a structural issue.