title: Recovery of gait after quadriceps muscle fatigue.
abstract: The aim of this study was to investigate the effect of recovery time after quadriceps muscle fatigue on gait in young adults. Forty young adults (20-40 years old) performed three 8-m gait trials at preferred velocity before and after muscle fatigue, and after 5, 10 and 20min of passive rest. In addition, at each time point, two maximal isometric voluntary contractions were preformed. Muscle fatigue was induced by repeated sit-to-stand transfers until task failure. Spatio-temporal, kinetic and muscle activity parameters, measured in the central stride of each trial, were analyzed. Data were compared between before and after the muscle fatigue protocol and after the recovery periods by one-way repeated measures ANOVA. The voluntary force was decreased after the fatigue protocol (p<0.001) and after 5, 10 and 20min of recovery compared to before the fatigue protocol. Step width (p<0.001) and RMS of biceps femoris (p<0.05) were increased immediately after the fatigue protocol and remained increased after the recovery periods. In addition, stride duration was decreased immediately after the fatigue protocol compared to before and to after 10 and 20min of rest (p<0.001). The anterior-posterior propulsive impulse was also decreased after the fatigue protocol (p<0.001) and remained low after 5, 10 and 20min of rest. We conclude that 20min is not enough to see full recovery of gait after exhaustive quadriceps muscle fatigue.
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil; Univ Estadual Paulista, Laboratory of Information, Vision, and Action, Bauru, Brazil. Electronic address: barbieri@fc.unesp.br.
authors.forename: Fabio Augusto
authors.initials: FA
authors.lastname: Barbieri
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil.
authors.forename: Stephannie Spiandor
authors.initials: SS
authors.lastname: Beretta
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil; Univ Estadual Paulista, Laboratory of Information, Vision, and Action, Bauru, Brazil.
authors.forename: Vinicius A I
authors.initials: VA
authors.lastname: Pereira
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil.
authors.forename: Lucas
authors.initials: L
authors.lastname: Simieli
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil.
authors.forename: Diego
authors.initials: D
authors.lastname: Orcioli-Silva
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil.
authors.forename: Paulo Cezar Rocha
authors.initials: PC
authors.lastname: dos Santos
authors.affiliation: MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands.
authors.forename: Jaap H
authors.initials: JH
authors.lastname: van Dieën
authors.affiliation: Univ Estadual Paulista, Posture and Gait Studies Laboratory, Rio Claro, Brazil.
authors.forename: Lilian Teresa Bucken
authors.initials: LT
authors.lastname: Gobbi
mesh_terms: D000328:Adult; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D052097:Quadriceps Muscle / Q000502:physiology*; D020127:Recovery of Function; D055815:Young Adult
keywords: Human movement; Muscle fatigue; Recovery time; Walking