BOUSSANA, A., S. MATECKI, O. GALY, O. HUE, M. RAMONATXO, and D. LE GALLAIS. The effect of exercise modality on respiratory muscle performance in triathletes. Med. Sci. Sports Exerc., Vol. 33, No. 12, 2001, pp. 2036–2043.
Purpose: The aim of this study was to examine the effects of the cycle-run and run-cycle successions of the triathlon and duathlon, respectively, on respiratory muscle strength and endurance.
Methods: Respiratory muscle strength was assessed by measuring maximal inspiratory (PImax) and expiratory (PEmax) pressures. Respiratory muscle endurance was assessed by measuring the time limit (Tlim). Twelve triathletes participated in a three-trial protocol. The first trial consisted of an incremental cycle test to assess the maximal oxygen uptake (&OV0312O2max) of triathletes. Trial 2 consisted of 20 min of cycling followed by 20 min of running (C-R), and trial 3 consisted of 20 min of running followed by 20 min of cycling (R-C). Trials 2 and 3 were performed at the same metabolic intensity (% &OV0312O2max). PImax and PEmax were measured before and 10 min after C-R and R-C, and 1 min after the post-C-R and post-R-C Tlim measurements (PImax 1′). Tlim was measured 1 d before and 30 min after C-R and R-C.
Results: The results showed a significant decrease in PImax after C-R (126.7 ± 4.3 cmH2O, P < 0.05) and R-C (123.7 ± 4.9 cmH2O, P < 0.05) compared with the baseline values (130 ± 3.8 and 129.6 ± 4.3 cmH2O, respectively). PImax 1′ showed a significantly greater decrease after R-C versus C-R (111.2 ± 5.5 cmH2O vs 121.2 ± 3.9 cmH2O, respectively, P < 0.001). Tlim after C-R (3.3 ± 0.3 min) and R-C (2.1 ± 0.3 min) decreased significantly compared with baseline values (4.19 ± 0.3 min and 4.02 ± 0.3 min, respectively). However, the Tlim decrease after R-C was significantly greater than after C-R (P < 0.001).
Conclusion: We concluded that respiratory muscle strength and endurance were less decreased after the cycle-run succession and that cycling induced a greater decrease in respiratory muscle endurance than running.
Laboratoire Sport Performance Santé, Faculté des Sciences du Sport, F-34090 Montpellier, FRANCE; Laboratoire ACTE, UFR-STAPS Antilles-Guyane, Campus de Fouillole BP 592, 97159 Pointre à Pitre, Cedex, FRANCE; and Laboratoire de Physiologie des Interactions, Centre Hospitalier Universitaire, Arnaud de Villeneuve, F-34295 Montpellier, Cedex 5, FRANCE
Submitted for publication September 2000.
Accepted for publication February 2001.