The relation between the flexion relaxation phenomenon onset angle and lumbar spine muscle reflex onset time in response to 30 min of slumped sitting |
| |
| Institution: | 1. School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John’s NL, Canada;2. Faculty of Medicine, Memorial University of Newfoundland, St. John’s NL, Canada;1. Department of Orthopaedics, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, People''s Republic of China;2. Department of Rehabilitation Medicine, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, People''s Republic of China;3. Department of Rehabilitation Medicine, Xiaohehushu Street Community Health Service Center, Hangzhou, People''s Republic of China;1. Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;2. Post Graduation Program in Rehabilitation and Functional Performance, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;3. Undergraduate Program in Physical Therapy, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;4. Department of Neuroscience and Behavioral Sciences, University of São Paulo, Ribeirão Preto, São Paulo, Brazil |
| |
| Abstract: | Viscoelastic creep of spine tissue, induced by submaximal spine flexion in sitting, can delay the onset of the flexion-relaxation phenomenon (FRP) and low back reflexes (LBR). Theoretically, these two outcome measures should be correlated; however, no studies have investigated this. This study aims to determine whether 30 min of near-maximal spine flexion will affect the onset of FRP and LBR in the lumbar erector spinae (LS) and lumbar multifidus (LM), and to examine the relation between these parameters. 15 participants were recruited (9F, 6M). Spine angle (between L1 and S2) was monitored synchronously with bilateral muscle activity in the LS (L1) and the LM (L4). FRP onset and LBR were measured in a randomized order before and after 30 min of slouched sitting. No significant difference was found for any muscle LBR onset time between pre and post-sitting (p > 0.05). A significant increase in FRP onset was found in the RLM (p = 0.016) following sitting. No significant correlation was found between the FRP and the LBR for any muscle. These results suggest that the LBR onset might not be as sensitive as an outcome measure to investigate shorter exposures of sitting as FRP. |
| |
| Keywords: | Spine Flexion relaxation phenomenon Low back reflex Lumbar flexion |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
