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The analysis of trail-running performance appears to be complex andcardio-respiratory and muscular factors could have a variable importancedepending on the inclination. Our study aims to determine the role of theseparameters in performance. 13 subjects with heterogeneous levels participatedin the study. They carried out 7 visits including 3 maximal aerobic speed (MAS)test at 1, 10 and 25% slope on treadmill, 3 endurance tests at 100% of the MASreached at 1, 10 and 25% and an evaluation on isokinetic ergometer at differentspeeds (60-180-240 {\textdegree}/s). Gas exchange measured during theincremental tests. We were able to identify 2 groups, a performance and arecreational group. We observe a difference in VO2max, MAS at 1 and 10%, andmaximal aerobic ascensional speed (MAaS) at 25%, between the 2 groups but nodifference in VO2max and exhaustion time at 100% MAS between the differentconditions (1-10-25%). Interestingly, at ventilatory thresholds the metabolicparameters, expressed as absolute or relative values, are similar betweenconditions (10-25%) while the ascensional speed are different. This studysuggests that the measurement of ascensional speed is not as relevant as heartrate for controlling intensity given the variety of slope gradients intrail-running races.

Cardiopulmonary responses and muscle strength influence running performance parameters differently at different slopes