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Journal

Is it possible to individualize Intensity of Eccentric Cycling Exercise from Perceived Exertion on Concentric Test?

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Published:25th Mar 2020
Objective: To assess the safety and acute effects of a procedure using perceived exertion during a prior submaximal concentric (CON) test to individualize eccentric (ECC) cycling exercise intensity. Design: Prospective monocentric open study. Setting: Technological Investigation Platform at the Physical Medicine and Rehabilitation Department, Dijon University Hospital. Participants: Eighteen healthy subjects aged between 22 and 37 years (15 men, 3 women) Interventions: The subjects performed 3 cycling exercises: (1) incremental CON test to determine the comfortable pedalling power (CPP) corresponding to a Borg scale rating of 12 (rate of perceived exertion); (2) steady state CON exercise at the CPP workload to determine the corresponding plantar pressure; (3) steady state ECC exercise with an imposed resistance corresponding to the CPP plantar pressure. Main Outcome Measures: Rate of perceived exertion on Borg scale, oxygen uptake (VO2), heart rate, cardiac output and stroke volume using inert gas rebreathing techniques were measured during steady state CON and ECC exercises. Muscle soreness was rated on a visual analogic scale immediately, 24 and 48h after the tests. Results: No adverse effects were reported. VO2 was about five times the resting value during CON exercise, while it was twice that during ECC exercise. Cardiac output was lower during ECC exercise (p<0.05), this moderate increase was exclusively linked to a greater increase in stroke volume during ecc exercise than during con exercise (p><0.05). conclusion: moderate intensity ecc cycling exercise tailored according to perceived exertion during a prior con test is well tolerated. it corresponds to limited muscular use of oxygen and to an isolated increase in stroke volume. it appears to be a feasible procedure for pre-conditioning before ecc training.>

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