Variability of ground reaction forces during treadmill walking
- 1 May 2002
- journal article
- research article
- Published by American Physiological Society in Journal of Applied Physiology
- Vol. 92 (5), 1885-1890
- https://doi.org/10.1152/japplphysiol.00969.2000
Abstract
The purpose of this study was to investigate whether or not the neuromuscular locomotor system is optimized at a unique speed by examining the variability of the ground reaction force (GRF) pattern during walking in relation to different constant speeds. Ten healthy male subjects were required to walk on a treadmill at 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0 km/h. Three components [vertical (F z ), anteroposterior (F y ), and mediolateral (F x ) force] of the GRF were independently measured for ∼35 steps consecutively for each leg. To quantify the GRF pattern, five indexes (first and second peaks of F z , first and second peaks of F y , and F x peak) were defined. Coefficients of variation were calculated for these five indexes to evaluate the GRF variability for each walking speed. It became clear for first and second peaks of F z and F x peak that index variabilities increased in relation to increments in walking speed, whereas there was a speed (5.5–5.8 km/h) at which variability was minimum for first and second peaks of F y , which were related to forward propulsion of the body. These results suggest that there is “an optimum speed” for the neuromuscular locomotor system but only for the propulsion control mechanism.Keywords
This publication has 24 references indexed in Scilit:
- Evidence for a Spinal Central Pattern Generator in HumansaAnnals of the New York Academy of Sciences, 1998
- Locomotor activity in spinal manThe Lancet, 1994
- Decomposition of superimposed ground reaction forces into left and right force profilesJournal of Biomechanics, 1993
- Quantitative analysis of gait in Parkinson patients: increased variability of stride lengthJournal of the Neurological Sciences, 1990
- Ground reaction forces at different speeds of human walking and runningActa Physiologica Scandinavica, 1989
- Energy‐speed relationship of walking: Standard tablesJournal of Orthopaedic Research, 1988
- Adaptability in frequency and amplitude of leg movements during human locomotion at different speedsActa Physiologica Scandinavica, 1987
- Kinematic and kinetic patterns in human gait: Variability and compensating effectsHuman Movement Science, 1984
- Moments of force and mechanical power in joggingJournal of Biomechanics, 1983
- Gait and the energetics of locomotion in horsesNature, 1981