NSCA Certified Strength & Conditioning Specialist (CSCS) Practice Exam

Detraining shows how physiological adaptations from regular training fade when the stimulus is removed. This reflects the reversibility principle: adaptations aren’t permanent and diminish once training stops. The speed and extent of decline depend on how long you trained, how intense it was, and the type of adaptations. Aerobic capacity (like VO2max) can start to fall after about one to two weeks of inactivity, while gains in strength and muscle size tend to decline after a few weeks of stopping. Some changes, such as neural efficiency, can revert more quickly, whereas others may persist a bit longer depending on prior training history.

This is different from specificity, which is about adaptations matching the exact mode and demands of the training; cross-training, which uses varied activities to maintain overall fitness; and tapering, which is a planned reduction in training load before competition to peak performance.