Active and Passive insufficiency

The terms active and passive insufficiency are important concepts in exercise programs: understanding the implications will help you design exercises that are more efficient and less injurious. Both active and passive insufficiency are functional states that occur in multi-joint muscles only. Active insufficiency occurs when a multi-joint muscle shortens over Both joints simultaneously, and hence, creates so much slack, that muscle tension is almost completely lost. Passive insufficiency occurs when the multi-joint muscle is lengthened to its fullest extent at both joints, but also preventing the full ROM of each joint it crosses.