Exercise-induced rib stress fractures: potential risk factors related to thoracic muscle co-contraction and movement pattern

Scandinavian Journal of Medicine & Science in Sports
Anders VintherPer Aagaard

Abstract

The etiology of exercise-induced rib stress fractures (RSFs) in elite rowers is unclear. The purpose of the study was to investigate thoracic muscle activity, movement patterns and muscle strength in elite rowers. Electromyographic (EMG) and 2-D video analysis were performed during ergometer rowing, and isokinetic muscle strength was measured in seven national team rowers with a history of RSF and seven matched controls (C). RSF displayed a higher velocity of the seat in the initial drive phase (RSF: 0.25+/-0.03, 0.25 (0.15-0.33) m/s vs C: 0.15+/-0.06, 0.18 (-0.11-0.29) m/s P=0.028) (Mean+/-SEM, median and range). Further, RSF had greater co-contraction of m. serratus anterior and m. trapezius in the mid-drive phase (RSF: 47.5+/-3.4, 48.5 (35.8-60.2)% EMG signal overlap vs C: 30.8+/-6.5, 27.0 (11.2-61.6)%P=0.043). In addition, the RSF subjects showed a lower knee-extension to elbow-flexion strength ratio (RSF: 4.2+/-0.22, 4.3 (3.5-5.1) vs C: 4.8+/-0.16, 5.0 (4.2-5.3) P=0.043), indicating stronger arms relative to legs compared with controls. In conclusion, increased thoracic muscle co-contraction, altered movement patterns and reduced leg/arm strength ratio were observed in the RSF subjects, which may all predispose toward an i...Continue Reading

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Citations

May 10, 2013·Sports Medicine·Timothy L MillerChristopher C Kaeding
Apr 23, 2011·Sports Medicine·Trent W LawtonMichael R McGuigan
Oct 13, 2011·Croatian Medical Journal·Tomislav SmoljanovicRadovan Radonic
Mar 26, 2014·Skeletal Radiology·Carrie HeincelmanRobert D Wissman
Nov 8, 2011·Journal of Shoulder and Elbow Surgery·Salma ChaudhuryScott A Rodeo
Dec 3, 2015·British Journal of Sports Medicine·Guy Evans, Ann Redgrave
Sep 8, 2012·Orthopedics·Timothy L Miller, Christopher C Kaeding
Mar 17, 2007·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Anders Holsgaard LarsenPer Aagaard
Feb 2, 2012·Scandinavian Journal of Medicine & Science in Sports·A VintherP Aagaard
Sep 17, 2014·Journal of Bone and Mineral Metabolism·Ewa ŚliwickaLucja Pilaczyńska-Szcześniak
Sep 28, 2012·Sports Health·Timothy M Hosea, Jo A Hannafin
Sep 1, 2016·Sports Medicine·Jane S ThorntonTomislav Smoljanovic
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Jun 27, 2020·British Journal of Sports Medicine·Larissa TreaseIvan Hooper
May 12, 2011·Journal of Aging and Physical Activity·Anders Holsgaard-LarsenPer Aagaard

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