Abstract
The preferred walking speed is a common measure of mobility that declines with age and has been related to maximal oxygen uptake (V̇O2,max). The present study determined whether this decline is associated with a higher percentage of the ventilatory threshold in older adults walking at their preferred speed. We compared the preferred walking speed and V̇O2 at this speed in relation to both V̇O2,max and V̇O2 corresponding to the ventilatory threshold (T VE) in healthy, physically active sexagenarians (G65, n=10) and octogenarians (G80, n=10) walking on a treadmill. The preferred walking speed was lower in G80 (1.16±0.09 m·s−1) than in G65 (1.38±0.09 m·s−1; P<0.001). Energy expenditure and the energy cost of walking at the preferred walking speed were not significantly different between the two groups. G80 subjects exhibited significantly higher fractions of V̇O2,max (60.8±8.0%) and T VE (74.2±7.9%) at the preferred walking speed than G65 (42.9±5.0 and 53.2±5.7% respectively; P<0.001). Multiple regression analysis showed that the fraction of T VE was the main determinant, with a small contribution of height, in the decline in the preferred walking speed in healthy and active elderly subjects (R 2=64%; P<0.001). These findings show that with age, walking at the preferred speed requires a higher fraction of T VE. This increase in the relative physiological effort at preferred walking speed could explain the reduction in this gait speed in healthy older subjects.
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The authors wish to thank Nicola Maffiuletti for helpful suggestions and criticism, the staff of the “Service d’Exploration Fonctionnelle Respiratoire” and the subjects for their participation.
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Malatesta, D., Simar, D., Dauvilliers, Y. et al. Aerobic determinants of the decline in preferred walking speed in healthy, active 65- and 80-year-olds. Pflugers Arch - Eur J Physiol 447, 915–921 (2004). https://doi.org/10.1007/s00424-003-1212-y
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DOI: https://doi.org/10.1007/s00424-003-1212-y