Changes in muscle activation patterns and subjective low back pain ratings during prolonged standing in response to an exercise intervention |
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| Authors: | Erika Nelson-Wong Jack P. Callaghan |
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| Affiliation: | 1. Regis University, School of Physical Therapy, Denver, CO, USA;2. University of Waterloo, Faculty of Applied Health Sciences, Department of Kinesiology, Waterloo, Ontario, Canada;1. Graduate School of Health Sciences, Kibi International University, 8 Iga-machi, Takahashi City 716-8508, Japan;2. Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan;1. Eastern Health Authority, St. John''s, Newfoundland and Labrador, Canada;2. Recovery and Performance Laboratory, Physical Medicine & Rehabilitation, Faculty of Medicine, Memorial University of Newfoundland, St. John''s, Newfoundland and Labrador, Canada;3. School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John''s, Newfoundland and Labrador, Canada;1. Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway;2. Clinic Physical Medicine and Rehabilitation, Vestfold Hospital Trust, Stavern Norway |
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| Abstract: | BackgroundLow back pain (LBP) development has been associated with occupational standing. Increased hip and trunk muscle co-activation is considered to be predisposing for LBP development during standing in previously asymptomatic individuals. The purpose of this work was to investigate muscle activation and LBP responses to a prescribed exercise program. Pain-developing (PD) individuals were expected to have decreased LBP and muscle co-activation following exercise intervention.MethodsElectromyography (EMG) data were recorded from trunk and hip muscle groups during 2-h of standing. An increase of >10 mm on visual analog scale (VAS) during standing was threshold for PD categorization. Participants were assigned to progressive exercise program with weekly supervision or control (usual activity) for 4 weeks then re-tested.ResultsForty percent were categorized as PD on day 1, VAS = 24.2 (±4.0) mm. PD exercisers (PDEX) had lower VAS scores (8.93 ± 3.66 mm) than PD control (PDCON) (16.5 ± 6.3 mm) on day 2 (p = 0.007). Male PDEX had decreased gluteus medius co-activation levels (p < 0.05) on day 2.DiscussionThe exercise program proved beneficial in reducing LBP during standing. There were changes in muscle activation patterns previously associated with LBP. Predisposing factors for LBP during standing were shown to change positively with appropriate exercise intervention. |
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