Local critical power is an index of local endurance

Abstract : The hypothesis thal critical power (CP) is significantly lower than the maximal aerobic power of the knec cxtensors has hccn tested in nine endurance-traincd subjccts, sevcn gymnasts and sevcn weight lirters. CP was calculated as heing equal to the slopc of the linear relationship bct\veen exhaustion lime and work pcrformcd at exhaustion on a knee-extcnsion ergometer. CP was comparcd with the power output at the end of a progressive knee-cxtension exercise (Prcnk) and the power outputs eorresponding to exhaustion times equal to 4 (P4 min), 6 (/\min), K (Px min) and 10 min (P 10 min), calculated according to the lincar relationship betwecn work and exhaustion time. The hypolhesis thal CP corresponds to a steady state in metabolic and physiological pararneters \vas testcd in the gymnasts and the \veight lillers hy comparing CP with the fatigue thresholds of the integratcd electromyog:ram (iEMGFT). lac-tate leve] (Lap 1). oxygen uptake (V0 2 IT) and heart rate (HR 1 Tl· The resulls of the present study demonstrate that the value of CP or a local cxercise cannot be con-sidcred as the equivalent of' the maximal aerobic power for general excrcises. The values or P4 1111 n, P6 min· Py, mirn P1o min and Pr~; 1 k wcre significantly higher than CP, and eorresponded to 13~, 126. 119, 115 and 151 "A, CP. re-spectivcly. The results of the present study indicatc that CP can be considcred as an index of muscular endurance. lndeed, LtF 1 , iEMG f-T· V0 2 FT and HRF· 1 vvere nol significantly different from CP. Ail of these fatigue thresholds wcre significantly correlatcd with CP (r > 0.92). Moreovcr. the highest coefficient of corre-Paris. /-rance lation (r = 0.71; P < 0.01) bctween the percentage of maximal aerobic power in cycling that corresponds to a blood lactate concentration of 4 mmol · 1-1 (OBLA 0 1Ô) and the difTerent local aerobic indices was observed with CP.
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Jean-Michel Le Chevalier, Henry Vandewalle, Chantalle Thépaut-Mathieu, Jean-François Stein, L. Caplan. Local critical power is an index of local endurance. European Journal of Applied Physiology, Springer Verlag, 2000, pp.120 - 127. ⟨hal-01758836⟩

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