Interactions between hyperventilation and vertical ground reaction force in standing posture

Pascal David (1) , Isabelle Mora (1) , Michel Petitjean (2)

1 APERE - Adaptations Physiologiques à l'Exercice et Réadaptation à l'effort - UR UPJV 3300
2 CHU Amiens-Picardie

Purpose: This study examines the effects of a hyperventilation (HV) induced by a physical exercise on the fluctuations of the vertical ground reaction force (Fz) in upright stance. Method: Twelve voluntary non-sedentary students were asked to maintain 30 seconds standing posture with open eyes on a force plate during quiet breathing (Pre-test) and after an incremental cycling exercise until exhaustion (Post-test). Over the 30 seconds of postural test, the mean amplitude of Fz fluctuations (ΔFz) was calculated and a spectral analysis of Fz by mean of a fast Fourier transform gave the spectral energy (En) and the mean power frequency (MPF). Cardiac frequency (FC) and ventilation (Ve) were measured with portable devices. Results and Discussion: Comparatively to the Pre-test values, HV led to a significant increase in FC and Ve, remaining at a high level 4 minutes following the end of exercise (P<0.01), expressing the recovery of the oxygen debt. Linear regression analysis showed strong correlations (P<0.0001) between ΔFz and FC (r = 0.80) or Ve (r = 0.85). Whereas En also showed higher values in Post-tests, correlated to ΔFz (r = 0.87), FC (r = 0.66) and Ve (r = 0.74), the MPF values were lower and inversely correlated to FC (r = -0.48) and Ve (r = -0.45). Thus, these results indicated that Fz depend on cardio-ventilatory changes during exercise. Conclusion: We conclude that hyperventilation during exercise up to maximal oxygen consumption lead to major postural disturbances showed by body oscillations in the frontal plane.

Mots clés: Posture; Hyperventilation; Vertical ground reaction force

Domaines: Sciences du Vivant [q-bio]

Pascal David, Isabelle Mora, Michel Petitjean. Interactions between hyperventilation and vertical ground reaction force in standing posture. Abstracts of the XVIIth Conference on Postural and Gait Research, May 2005, Marseille, France. pp.S145. ⟨hal-01064386⟩