deconditioning       
noun [ U ]  medical specialized uk/ˌdiː.kənˈdɪʃ.ən.ɪŋ/ us/ˌdiː.kənˈdɪʃ.ən.ɪŋ/
 (因疾病、受伤或缺乏运动而造成)体能失调
the process of losing physical strength through being ill, injured, or not active
  Exercise is very important during recovery, for maintaining muscle strength and avoiding deconditioning. 恢复期间做运动非常重要,可保持肌肉力量和避免体能失调。 
 If a back brace is used for too long, it can lead to deconditioning of the muscles that support the back. 后背支架如果用得太久可能会造成支持后背的肌肉力量失调。 
 - More examples
 - Prolonged bed rest results in cardiovascular deconditioning.
 - When a middle-aged couch potato is exhausted after three minutes on the treadmill, the doctor wonders whether this is heart disease or just deconditioning.
 - There may be deconditioning due to muscle disuse through pain or fear of pain.
 - The patient should begin physiotherapy to avoid further physical deconditioning and disability.