Simplified indices of exercise tolerance in patients with multiple sclerosis and healthy subjects: a case-control study.

Among patients with multiple sclerosis (MS), the impairment of exercise tolerance is closely related to disability. Maximal oxygen uptake (VO ) is the gold standard to assess exercise tolerance in healthy subjects (HS). Among patients with MS, the accuracy of VO measurement is often impaired because the patients are unable to reach the maximal exercise intensity due to inter-dependent factors linked to the disease (such as pathological fatigue, pain, lack of exercise habit and lack of mobility). This study assesses the accuracy of simplified indices for assessing exercise tolerance, which are more suitable in patients with MS. They are simple in the way they are either measurable during submaximal exercise (oxygen uptake efficiency slopes (OUES), physical working capacity at 75% of maximal heart rate (PWC ), oxygen consumption at a respiratory exchange ratio of 1 (VO @RER1)); and/or not based on gas exchange analysis (peak work rate(PWR)-based predictive equation and PWC ).. All indices were significantly lower in the MS group compared to the HS group (P0.70, P