TY - JOUR AU - Bosquet, L.; Gouadec, K.; Berryman, N.; Duclos, C.; Gremeaux, V.; Croisier, J.-L. TI - Physiological Interpretation of the Slope during an Isokinetic Fatigue Test SN - 0172-4622 SN - 1439-3964 PY - 2015 JO - Int J Sports Med JF - International Journal of Sports Medicine LA - EN VL - 36 IS - 08 SP - 680 EP - 683 ET - 2015/05/05 DA - 2015/06/30 KW - isokinetic dynamometry KW - muscle fatigue KW - anaerobic capacity KW - aerobic capacity AB - 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. PB - © Georg Thieme Verlag KG DO - 10.1055/s-0034-1398626 UR - http://www.thieme-connect.de/products/ejournals/abstract/10.1055/s-0034-1398626 ER -