title: The Total Work Measured During a High Intensity Isokinetic Fatigue Test Is Associated With Anaerobic Work Capacity.
abstract: 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 well-trained 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. Key pointsTotal work performed during a high intensity isokinetic fatigue test can be considered as a valid measure of anaerobic work capacity (as determined by total work performance during a 30-s Wingate anaerobic test).The 95% limits of agreement are two large to allow a direct comparison between both measures. In other words, it is not possible to estimate the magnitude of performance improvement during a 30-s Wingate anaerobic test from that observed during a high intensity isokinetic fatigue test.In addition to provide sport scientists and coaches with measures of peak torque and ratios between agonists and antagonists muscles in a perspective of injury prevention, isokinetic dynamometry can also be used in the physiological assessment of athletes. However, some precautions should be taken in the interpretation of data.
authors.affiliation: Laboratory MOVE (EA6314), Faculty of Sports Science, University of Poitiers, Poitiers, France; Department of Kinesiology, Université de Montréal, Montreal, Canada.
authors.forename: Laurent
authors.initials: L
authors.lastname: Bosquet
authors.affiliation: Department of Kinesiology, Université de Montréal , Montreal, Canada.
authors.forename: Kenan
authors.initials: K
authors.lastname: Gouadec
authors.affiliation: Laboratory MOVE (EA6314), Faculty of Sports Science, University of Poitiers, Poitiers, France; Department of Sport Studies, Bishop's University, Québec, Canada; National Institute of Sport, Montréal, Canada.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Berryman
authors.affiliation: Laboratory of Pathokinesiology, Center for Interdisciplinary Research in Rehabilitation, Montreal, Canada; School of Rehabilitation, Faculty of Medicine, Université de Montréal, Montreal, Canada.
authors.forename: Cyril
authors.initials: C
authors.lastname: Duclos
authors.affiliation: Plateforme d'Investigation Technologique, Centre Hospitalier Universitaire, Dijon cedex, France; Faculty of Sport Sciences, University of Bourgogne, Dijon cedex, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Gremeaux
authors.affiliation: Department of Motricity Sciences, University of Liege , Belgium.
authors.forename: Jean Louis
authors.initials: JL
authors.lastname: Croisier
keywords: Isokinetic dynamometry; Wingate anaerobic test; cyclists; muscle fatigue; physiological assessmen