Lumbo-Pelvic Biomechanics and Quadratus Lumborum Asymmetry in Cricket Fast Bowlers.

• Autores: Helen Crewe, Amity C. Campbell, Bruce Elliott, Jacqueline A. Alderson
• Localización: Medicine & Science in Sports & exercise: Official Journal of the American College of Sports Medicine, ISSN 0195-9131, Vol. 45, Nº. 4, 2013, págs. 778-783
• Idioma: inglés
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• Resumen

  • AB Purpose: This study aimed to analyze lumbo-pelvic lateral flexion kinematics and kinetics in junior fast bowlers and compare bowlers with varying quadratus lumborum (QL) cross-sectional area (CSA) asymmetry profiles. Methods: Magnetic resonance imaging was used to determine QL CSA of 39 participants who also underwent three-dimensional analysis of their bowling action. Results: Bowlers with greater than 10% QL asymmetry (n = 26) experienced a larger peak lumbo-pelvic lateral flexion; angle (21.6[degrees] +/- 4.2[degrees]), angular velocity (314.9[degrees][middle dot]s-1 +/- 86.6[degrees][middle dot]s-1), moment (12.8 +/- 2.5 N[middle dot]m[middle dot]kg-1[middle dot]m-1), positive power (25.6 +/- 12.6 W[middle dot]kg-1[middle dot]m-1), and negative power (48.6 +/- 20.9 W[middle dot]kg-1[middle dot]m-1) compared with the bowlers with less than 10% asymmetry (n = 13) (angle = 18.1[degrees] +/- 1.9[degrees], angular velocity = 243.8[degrees][middle dot]s-1 +/- 64.9[degrees][middle dot]s-1, moment = 10.4 +/- 2.8 N[middle dot]m[middle dot]kg-1[middle dot]m-1, positive power = 14.7 +/- 7.4 W[middle dot]kg-1[middle dot]m-1, and negative power = 33.8 +/- 17.7 W[middle dot]kg-1[middle dot]m-1; P < 0.05). Conclusion: Fast bowlers with QL CSA asymmetry in excess of 10% experience increased lumbo-pelvic lateral flexion loads during bowling. As increased lateral flexion loads may increase the risk of spondylolysis development, the presence of large QL asymmetry may be a useful screening tool for identifying bowlers at risk of developing lumbar spondylolysis.