The total work measured during a high intensity isokinetic fatigue test is associated with anaerobic work capacity

The purpose of the study was to determine whether total work measured during a high intensity isokinetic fatigue test (twfat) could be considered as a valid measure of anaerobic work capacity (awc),such as determined by total work measured during a wingate anaerobic test (twwant). twenty welltrained cyclists performed 2 randomly ordered sessions involving a high intensity isokinetic fatigue test consisting in 30 reciprocal maximal concentric contractions of knee flexors and extensors at 180°∙s-1,and a wingate anaerobic test. we found that twfat of knee extensors was largely lower than twwant (4151 ± 691 vs 22313 ± 2901 j,respectively,p < 0.05,hedge’s g = 4.27). both measures were highly associated (r = 0.83),and the 95% limits of agreement (loa) represented 24.5% of twwant. twfat of knee flexors (2151 ± 540 j) was largely lower than twwant (p < 0.05,g = 9.52). by contrast,both measures were not associated (r = 0.09),and the 95% loa represented 31.1% of twwant. combining twfat of knee flexors and knee extensors into a single measure (6302 ± 818 j) did not changed neither improved these observations. we still found a large difference with twwant (p < 0.05,g = 5.26),a moderate association (r = 0.65) and 95% loa representing 25.5% of twwant. we concluded that twfat of knee extensors could be considered as a valid measure of awc,since both measure were highly associated. however,the mean difference between both measures and their 95% loa were too large to warrant interchangeability. © journal of sports science and medicine