title: Evaluation of muscle fatigue during 100-m front crawl.
abstract: The aim of this study was to evaluate muscle fatigue in upper body muscles during 100-m all-out front crawl. Surface electromyogram (EMG) was collected from the pectoralis major, latissimus dorsi and triceps brachii muscles of 11 experienced swimmers. Blood lactate concentration level increased to 14.1 ± 2.9 mmol l(-1) 5 min after the swim. The velocity, stroke length and stroke rate calculated based on video analysis decreased by 15.0, 5.8 and 7.4%, respectively, during the swim. EMG amplitude of the triceps and the lower part of the latissimus muscles increased, whilst the mean power frequency (MNF) of all muscles significantly decreased by 20-25%. No significant differences in the relative MNF decrease were observed amongst the muscles; however, the differences in the rate of the MNF decrease between the lower part of the latissimus and the triceps brachii muscles were found (P < 0.05). The time of rest between the muscle activation of the two consecutive arm strokes at the end of swimming was extended (P < 0.05). It was concluded that 100-m all-out crawl induced significant fatigue with no evident differences amongst the analysed muscles.
authors.affiliation: Faculty of Sport, University of Ljubljana, Gortanova 22, 1000, Ljubljana, Slovenia. igor.stirn@fsp.uni-lj.si
authors.forename: Igor
authors.initials: I
authors.lastname: Stirn
authors.forename: Tomaz
authors.initials: T
authors.lastname: Jarm
authors.forename: Venceslav
authors.initials: V
authors.lastname: Kapus
authors.forename: Vojko
authors.initials: V
authors.lastname: Strojnik
mesh_terms: D001132:Arm / Q000502:physiology; D004576:Electromyography; D006801:Humans; D007773:Lactates / Q000097:blood*; D009048:Motor Skills / Q000502:physiology; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D013550:Swimming; D055815:Young Adult
chemical_list: D007773:Lactates
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