Deconditioning Type 1 fibres

• Effects of deconditioning on type I fibres:

  Depending on the muscles affected, type I detraining will result in either:

  • A loss of the endurance capacity of a specific muscle or muscle group
  • A loss of aerobic capacity / VO2 max / cardiorespiratory fitness {CRF}
• • If aerobic deconditioning is confined to a muscle (e.g. poor endurance of biceps) the type 1 fibres of that muscle will have a limited capacity to produce force for a significant time period
  • leading to specific functional implications
• • If deconditioning is generalised (e.g. poor cardiorespiratory fitness (CRF) / low VO2 max) “all” type 1 fibres in the body will have a limited capacity to produce force for a significant time period
  • leading independence consequences e.g. Unable to walk > 5/ 10/ 20 mins
  • In addition a low CRF is associated with an increased burden of chronic morbidity e.g heart disease, type 2 diabetes, metabolic syndrome, stroke etc…