Flexed lumbar spine postures are associated with greater strength and efficiency than lordotic postures during a maximal lift in pain-free individuals
| Autor: | Peter O'Sullivan, Mark Boocock, Laura Holder, Grant Mawston |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Adult
Male musculoskeletal diseases medicine.medical_specialty Weight Lifting Posture Biophysics Electromyography Young Adult 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Lumbar Humans Medicine Orthopedics and Sports Medicine Muscle Skeletal Lumbar Vertebrae medicine.diagnostic_test Lift (data mining) business.industry Rehabilitation Torso 030229 sport sciences Pain free musculoskeletal system Trunk Low back pain body regions Female Lumbar spine medicine.symptom business Trunk muscle Low Back Pain human activities 030217 neurology & neurosurgery |
| Zdroj: | Gait & Posture. 86:245-250 |
| ISSN: | 0966-6362 |
| DOI: | 10.1016/j.gaitpost.2021.02.029 |
| Popis: | Inspite of common lifting advice to maintain a lordotic posture, there is debate regarding optimal lumbar spine posture during lifting. To date, the influence of lumbar posture on trunk muscle recruitment, strength and efficiency during high intensity lifting has not been fully explored.How do differences in lumbar posture influence trunk extensor strength (moment), trunk muscle activity, and neuromuscular efficiency during maximal lifting?Twenty-six healthy participants adopted three lumbar postures (maximal extension (lordotic), mid-range (flat-back), and fully flexed) in a free lifting position. Motion analysis and force measurements were used to determine the back extensor, hip and knee moments. Surface electromyography (EMG) of three trunk extensors and the internal obliques were recorded. Neuromuscular efficiency (NME) was expressed as a ratio of normalised extensor moment to normalised EMG.Significantly higher back extensor moments were exerted when moving from an extended to mid-range, and from a mid-range to fully flexed lumbar posture. This was accompanied by a decrease in activity across all three back extensor muscles (P 0.001) resulting in a higher NME of these muscles in more flexed postures. Change in lumbar posture did not influence hip or knee moments or internal oblique activation.A flexed-back posture is associated with increased strength and efficiency of the back muscles compared to a lordotic posture. These findings further question the manual handling advice to lift with a lordotic lumbar spine. |
| Databáze: | OpenAIRE |
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