Phasic-to-tonic shift in trunk muscle activity relative to walking during low-impact weight bearing exercise

作者：Caplan Nick^*; Gibbon Karl; Hibbs Angela; Evetts Simon; Debuse Dorothee

来源：Acta Astronautica, 2014, 104(1): 388-395.

DOI：10.1016/j.actaastro.2014.05.009

• Lumbopelvic muscles
• Exercise
• Phasic-to-tonic shift
• Low back pain
• Preferential recruitment of spinal extensors over flexors

The aim of this study was to investigate the influence of an exercise device, designed to improve the function of lumbopelvic muscles via low-impact weight-bearing exercise, on electromyographic (EMG) activity of lumbopelvic, including abdominal muscles. Surface EMG activity was collected from lumbar multifidus (LM), erector spinae (ES), internal oblique (IO), external oblique (EO) and rectus abdominis (RA) during overground walking (OW) and exercise device (EX) conditions. During walking, most muscles showed peaks in activity which were not seen during EX. Spinal extensors (LM, ES) were more active in EX. Internal oblique and RA were less active in EX. In EX, LM and ES were active for longer than during OW Conversely, EO and RA were active for a shorter duration in EX than OW. The exercise device showed a phasic-to-tonic shift in activation of both local and global lumbopelvic muscles and promoted increased activation of spinal extensors in relation to walking. These features could make the exercise device a useful rehabilitative tool for populations with lumbopelvic muscle atrophy and dysfunction, including those recovering from deconditioning due to long-term bed rest and microgravity in astronauts.

• 出版日期2014-11