title: Effects of walking in a force field for varying durations on aftereffects and on next day performance.
abstract: This study investigated the effects of walking in an elastic force field (FF) for varying durations (49-1,629 strides) on: (a) the magnitude and duration of aftereffects, (b) performance in the FF on the next day. On day 1 in the FF, subjects (n = 17) showed an initial large error in peak toe velocity during swing (9-61% above baseline) that was largely reduced within the first 40 strides. After FF removal, subjects (16/17) showed aftereffects: (1) reduction in toe velocity (9-38% below baseline), (2) increase in hamstrings muscle activation. While the magnitude of aftereffects did not correlate to FF exposure duration, aftereffects duration did (p < 0.05). During FF exposure on day 2, initial toe velocity error was smaller than on day 1 (13/17 subjects, p < 0.001) regardless of day 1 exposure duration. This was associated with an earlier effective onset in hamstring activation. These results suggest that during walking, even short daily exposures to a FF (> or =49 strides) lead to significant retention of the new movement parameters.
authors.affiliation: Center for Interdisciplinary Research in Rehabilitation and Social Integration (CIRRIS), Quebec Rehabilitation Institute, 525 Blvd. Wilfrid-Hamel, Room H-1320, Quebec, QC, G1M 2S8, Canada.
authors.forename: Karine
authors.initials: K
authors.lastname: Fortin
authors.forename: Andreanne
authors.initials: A
authors.lastname: Blanchette
authors.forename: Bradford J
authors.initials: BJ
authors.lastname: McFadyen
authors.forename: Laurent J
authors.initials: LJ
authors.lastname: Bouyer
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D000328:Adult; D001696:Biomechanical Phenomena; D004548:Elasticity; D005080:Exercise Test; D025461:Feedback, Physiological / Q000502:physiology; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D007858:Learning / Q000502:physiology*; D007866:Leg / Q000033:anatomy & histology / Q000502:physiology; D008124:Locomotion / Q000502:physiology; D008297:Male; D008875:Middle Aged; D009048:Motor Skills / Q000502:physiology*; D009068:Movement / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000033:anatomy & histology / Q000502:physiology; D013997:Time Factors; D016138:Walking / Q000502:physiology*; D055815:Young Adult
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