• Mehdi Chlif, David Keochkerian, Abdou Temfemo, Dominique Choquet, and Said Ahmaidi.
• EA 3300 "APS and Motor Patterns, Adaptations-Rehabilitation,", Picardie Jules Verne University, Sport Science Department, F-80025 Amiens Cedex, France; Tunisian Research Laboratory Sport Performance Optimization, National Center of Medicine and Science in Sports (CNMSS), Bp263, Ave Med Ali Akid, 1004 El, Menzah, Tunis, Tunisia. Electronic address: mehdi.chlif@gmail.com.
• Respir Physiol Neurobiol. 2016 Jul 1; 228: 61-8.

AbstractThe aim of this study was to compare the inspiratory muscle performance during an incremental exercise of twelve fit old endurance-trained athletes (OT) with that of fit young athletes (YT) and healthy age-matched controls (OC). The tension-time index (TT0.1) was determined according to the equation TT0.1=P0.1/PImax×ti/ttot, where P0.1 is the mouth occlusion pressure, PImax the maximal inspiratory pressure and ti/ttot the duty cycle. For a given VCO2, OT group displayed P0.1, P0.1/PImax ratio, TT0.1 and effective impedance of the respiratory muscle values which were lower than OC group and higher than YT group. At maximal exercise, P0.1/PImax ratio and TT0.1 was still lower in the OT group than OC group and higher than YT group. This study showed lower inspiratory muscle performance attested by a higher (TT0.1) during exercise in the OT group than YT group, but appeared to be less marked in elderly men having performed lifelong endurance training compared with sedentary elderly subjects.Copyright © 2016 Elsevier B.V. All rights reserved.

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