<unk>  is adaptation of an organism to less demanding environment, or, alternatively, the decrease of physiological adaptation to normal conditions. Decondition may result from decreased physical activity, prescribed bed rest, orthopedic casting, paralysis, aging, etc. A particular interest in the study of<unk>  is in aerospace medicine, to diagnose, fight, and prevent adverse effects of the conditions of space flight.<unk>  due to decreased physical effort results in muscle loss, including heart muscles.<unk>  due to lack of gravity or non-standard gravity action (e.g., during bed rest) results in abnormal distribution of body fluids.
Deconditioning
Preconditioning 
Overtraining
Ischemic preconditioning
Neuraxial blockade
Neural adaptation
Allostatic load
Myocardial stunning