Exercise-induced rib stress fractures: potential risk factors related to thoracic muscle co-contraction and movement pattern
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Exercise-induced rib stress fractures: potential risk factors related to thoracic muscle co-contraction and movement pattern. / Vinther-Knudsen, Archibald; Kanstrup, I-L; Christiansen, E; Alkjaer, T; Larsson, B; Magnusson, S P; Ekdahl, C; Aagaard, P.
In: Scandinavian Journal of Medicine & Science in Sports, Vol. 16, No. 3, 2006, p. 188-196.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Exercise-induced rib stress fractures: potential risk factors related to thoracic muscle co-contraction and movement pattern
AU - Vinther-Knudsen, Archibald
AU - Kanstrup, I-L
AU - Christiansen, E
AU - Alkjaer, T
AU - Larsson, B
AU - Magnusson, S P
AU - Ekdahl, C
AU - Aagaard, P
PY - 2006
Y1 - 2006
N2 - 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 increased risk of RSF.
AB - 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 increased risk of RSF.
KW - Adult
KW - Athletic Injuries
KW - Case-Control Studies
KW - Disease Susceptibility
KW - Elbow Joint
KW - Electromyography
KW - Ergometry
KW - Female
KW - Fractures, Stress
KW - Humans
KW - Knee Joint
KW - Lower Extremity
KW - Male
KW - Motor Activity
KW - Movement
KW - Muscle Contraction
KW - Muscle, Skeletal
KW - Rib Fractures
KW - Risk Factors
KW - Thorax
KW - Upper Extremity
KW - Video Recording
U2 - 10.1111/j.1600-0838.2005.00473.x
DO - 10.1111/j.1600-0838.2005.00473.x
M3 - Journal article
C2 - 16643197
VL - 16
SP - 188
EP - 196
JO - Scandinavian Journal of Medicine & Science in Sports
JF - Scandinavian Journal of Medicine & Science in Sports
SN - 0905-7188
IS - 3
ER -
ID: 1207991