8. By periodically varying the resistance training program variables, long-term performance gains will likely and the risk of overuse injuries will likely

By periodically varying the resistance training program variables, long-term performance gains will likely increase and the risk of overuse injuries will likely decrease.

Explanation:

Overuse injuries result from error in training programs. If you repeatedly traumatize a muscle or joint, it will eventually become injured. To prevent this, resistance in training program must be varied periodically. If you repeat the same exercise with the same weight over and over (specially if done wrongly), injures will happen. Varying resistance also helps long-term performance, usually helping improve muscle strength.

answer; a biased sample;