Flexion-Relaxation Phenomenon during Trunk Asymmetric Forward Bending

KASAHARA Satoshi, TODUKA Mitsuhisa, TAKAHASHI Mitsuhiko, MIYAMOTO Kenji

doi:10.1589/rika.25.133

[Purpose] The purpose of this study was to examine the flexion-relaxation phenomenon (FRP) of the lumbar erector spinae muscles (ES) during asymmetric forward bending with lumbar flexion and rotation in healthy young males. [Subjects] Ten healthy young males (mean age 22.0 ± 0.8 [SD] years) participated in this study. [Methods] Subjects were asked to perform three tasks: forward bending without lumbar rotation (Task 1), forward bending with lumbar rotation from the standing position with rotation (Task 2) and forward bending with lumbar rotation from the standing position without rotation (Task 3). Muscle activities from both ES and the lumbar motion were recorded by electromyography and an electromagnetic system. The onset of the FRP was identified with the data from these devices. [Results] The FRP of bilateral ES occurred nearly simultaneously during Task 1. There was a significant difference between the sides of ES for the onset of FRP during Task 2 (p<0.01). The FRP of the rotated side did not occur during Task 3. [Conclusion] Our findings suggest that the onset and appearance of the FRP of the ES differ between symmetric and asymmetric forward bending in healthy young males. Also, the FRP of the ES is influenced by the rotation direction during asymmetric forward bending.<br>

Flexion-Relaxation Phenomenon during Trunk Asymmetric Forward Bending

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