The case history of an elite ultra-endurance cyclist who developed Chronic Fatigue Syndrome (CFS)

An elite ultra-endurance athlete, who had previously undergone

physiological and performance testing, developed chronic

fatigue syndrome (CFS). An incremental cycling exercise test

conducted while he was suffering from CFS indicated decreases

in maximum workload achieved (Wmax; -11.3%), the maximum

oxygen uptake (VO2max; -12.5%), and the anaerobic threshold

(AT; -14.3%) compared to pre-CFS data. A third test conducted

after the athlete had shown indications of significant

improvement in his clinical condition revealed further

decreases in Wmax (-7.9%), VO2max (-10.2%) and AT (-8.3%).

These data, along with submaximal exercise data and muscle

biopsy electron microscopic analyses, suggest that the

performance decrements were the result of detraining, rather

than an impairment of aerobic metabolism due to CFS per se.

These data may be indicative of central, possibly

neurological, factors influencing fatigue perception in CFS


1 Star2 Stars3 Stars4 Stars5 Stars (82 votes, average: 2.95 out of 5)

Leave a Reply