sedentary habit produces many ill effects on musculo-skeletal & cardiorespiratory system. both skeletal muscles and cardiac muscles can work in a wide range of contractile activity. cardiac contractility in many ways depends on rate & style of musculoskeletal contraction.
the challenge thrown by sedentary habits however is mono directional make both (musculo-skeletal & cardiorespiratory system) of them UNI-PACED. sacrificing the entire fringe of contractile activity & trading it for sedentary individual comfort makes us prone to loss of many functional capacities more importantly it makes us vulnerable to many diseases.