Int J Sports Med 2015; 36(08): 680-683
DOI: 10.1055/s-0034-1398626
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Physiological Interpretation of the Slope during an Isokinetic Fatigue Test

L. Bosquet
1  Université de Poitiers, Faculté des sciences du sport, Poitiers, France
,
K. Gouadec
2  Kinesiology, University of Montreal, Montreal, Canada
,
N. Berryman
2  Kinesiology, University of Montreal, Montreal, Canada
,
C. Duclos
3  Physical Medicine and Rehabilitation, University of Montreal, Montreal, Canada
,
V. Gremeaux
4  Pôle Rééducation- Réadaptation, CHU Dijon, France
5  Plateforme d’investigation technologique, CIC-P Inserm 803, CHU Dijon
6  Inserm U 1093 “Cognition, action, et Plasticité sensorimotrice” , Dijon
,
J.-L. Croisier
7  Physical Medicine and Rehabilitation, University of Liege, LIEGE, Belgium.
› Author Affiliations
Further Information

Publication History



accepted after revision 27 December 2014

Publication Date:
05 May 2015 (online)

Abstract

To assess the relationship between selected measures (the slope and average performance) obtained during a high intensity isokinetic fatigue test of the knee (FAT) and relevant measures of anaerobic and aerobic capacities. 20 well-trained cyclists performed 3 randomly ordered sessions involving a FAT consisting in 30 reciprocal maximal concentric contractions of knee flexors and extensors at 180°.s−1, a maximal continuous graded exercise test (GXT), and a Wingate anaerobic test (WAnT). The slope calculated from peak torque (PT) and total work (TW) of knee extensors was highly associated to maximal PT (r=−0.86) and maximal TW (r=−0.87) measured during FAT, and moderately associated to peak power output measured during the WAnT (r=−0.64 to −0.71). Average PT and average TW were highly associated to maximal PT (r=0.93) and maximal TW (r=0.96), to mean power output measured during WAnT (r=0.83–0.90) and moderately associated to maximal oxygen uptake (0.58–0.67). In conclusion, the slope is mainly determined by maximal anaerobic power, while average performance is a composite measure depending on both aerobic and anaerobic energy systems according to proportions that are determined by the duration of the test.