Int J Sports Med 2003; 24(1): 63-70
DOI: 10.1055/s-2003-37201
Training & Testing
Training and Testing
© Georg Thieme Verlag Stuttgart · New York

The Effects of Prior Cycling and a Successive Run on Respiratory Muscle Performance in Triathletes

A.  Boussana1 , O.  Galy1 , O.  Hue2 , S.  Matecki3 , A.  Varray1 , M.  Ramonatxo3 , D.  Le Gallais1
  • 1UPRES EA 2991, Laboratoire Sport Performance Santé, Faculté des Sciences du Sport, France
  • 2Laboratoire ACTE, UFR STAPS Antilles Guyane, France
  • 3Laboratoire de Physiologie des Interactions, CHU Arnaud de Villeneuve, France
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Publikationsverlauf

Accepted after revision: May 30, 2002

Publikationsdatum:
12. Februar 2003 (online)

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Abstract

The aim of the present study was to compare the effects of prior cycling and a successive run on respiratory muscle performance during a cycle-run succession as performed in the triathlon. We hypothesized that despite the moderate intensity of exercise and the absence of exhaustion, the crouched cycling position would induce a decrease in respiratory muscle performance that would be reversed by the successive vertical run position. Ten male triathletes (22.6 ± 1.1 yr) performed a four-trial protocol: 1) an incremental cycle test to assess maximal oxygen uptake (V˙O2max), 2) 20 min of cycling (C), 3) 20 min of running (R), and 4) 20 min of cycling followed by 20 min of running (C-R). Trials 2, 3 and 4 were performed at the same metabolic intensity, i. e., 75 % of V˙O2max. Respiratory muscle force was assessed by measuring maximal expiratory (PEmax) and inspiratory (PImax) pressures from the functional residual capacity (FRC) before and 10 min after C, R, and C-R. Respiratory muscle endurance was assessed one day before and 30 min after C, R, and C-R, by measuring the time limit (Tlim), which corresponds to the length of time a respiratory load can be sustained before the process of fatigue develops sufficiently to cause task failure. The results showed a similar significant decrease in PImax (132.4 ± 4.9 versus 125.7 ± 5.6 cmH2O, p < 0.05) and Tlim (5.22 ± 0.28 versus 3.68 ± 0.32 min, p < 0.05) post-C and post-C-R (133.7 ± 4.0 versus 126.9 ± 5.2 cmH2O, and 5.29 ± 0.18 versus 3.49 ± 0.41 min, respectively, p < 0.05) compared with the pre-trial values. In contrast, PImax and Tlim were not significantly decreased post-R (131.8 ± 6.1 cm H2O versus 129.6 ± 6.4 cmH2O, and 4.90 ± 0.69 versus 4.40 ± 0.56 min, respectively, p > 0.05). We concluded that moderate intensity exercise not performed to exhaustion induced a decrease in respiratory muscle performance. Moreover, the respiratory muscle fatigue induced by prior cycling was maintained, and neither reversed nor worsened, by the successive run.

References

D. Le Gallais

UPRES EA 2991 · Laboratoire Sport Performance Santé

700, avenue du Pic Saint Loup, 34090 Montpellier, France ·

Telefon: +33 04 67 41 57 32

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eMail: d.legallais@staps.univ-montp1.fr