Comparison of trunk electromyographic muscle activity depends on sitting postures.

Background: Different postural positions can be characterized by the activation and relative contributions of different postural muscles, and may variously contribute to the recovery from or worsening of chronic lower back pain.

Objective: The present study aimed to investigates trunk muscle activities in four types of seated postures: cross-legged, long, side, and W-shaped.

Methods: Eight healthy adults participated in the study.