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Lower back pain is commonly associated with golfers. The study aimed: to determine whether thoracic- and lumbar-erector-spinae muscle display signs of muscular fatigue after completing a golf practice session, and to examine the effect of the completed practice session on club head speed, ball speed and absolute carry distance performance variables. Fourteen right-handed male golfers participated in the laboratory-based-study. Surface electromyography (EMG) data was collected from the lead and trail sides of the thoracic- and lumbar-erector-spinae muscle. Normalized root mean squared (RMS) EMG activation levels and performance variables for the golf swings were compared before and after the session. Fatigue was assessed using median frequency (MDF) and RMS during the maximum voluntary contraction (MVC) performed before and after the session. No significant differences were observed in RMS thoracic- and lumbar-erector-spinae muscle activation levels during the five phases of the golf swing and performance variables before and after the session (p > .05). Significant changes were displayed in MDF and RMS when comparing the MVC performed before and after the session (p < .05). Fatigue was evident in the trail side of the erector-spinae muscle after the session.
Sorbie is with School of Science and Sport, Institute for Clinical Exercise & Health Science, University of the West of Scotland, Hamilton, United Kingdom; and Division of Sport and Exercise Sciences, Abertay University, Dundee, DD1 1HG, United Kingdom. Grace is with School of Science and Sport, Institute for Clinical Exercise & Health Science, University of the West of Scotland, Hamilton, United Kingdom; and Faculty of Health, Human Movement & Sport Sciences, Federation University Australia, Ballarat, Victoria, Australia. Gu is with Faculty of Sports Science, Ningbo University, Ningbo, China. Baker is with School of Science and Sport, Institute for Clinical Exercise & Health Science, University of the West of Scotland, Hamilton, United Kingdom; and Faculty of Sports Science, Ningbo University, Ningbo, China. Ugbolue is with School of Science and Sport, Institute for Clinical Exercise & Health Science, University of the West of Scotland, Hamilton, United Kingdom; and the Department of Biomedical Engineering, University of Strathclyde, Glasgow, United Kingdom.