Beibei Wang

Department of Exercise and Sport Sciences, Faculty of Graduate School, Khon Kaen University, Khon Kaen 40002, Thailand

Yang Hu

Traditional Chinese Medicine Characteristic Nursing Outpatient Clinic, Ganzhou City Hospital of Traditional Chinese Medicine, Ganzhou, 341000, China

Hongxiu Chen

Department of Exercise and Sport Sciences, Faculty of Graduate School, Khon Kaen University, Khon Kaen 40002, Thailand.

Dehui Lai

Department of Medical Technology, Gannan Health Vocational College, Gan Zhou, 341000, China

Wichai Eungpinichpong

School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand

Keywords: Gua Sha, lumbar flexibility, heart rate variability, tissue hardness, pressure pain threshold, thoracolumbar fascia, skin temperature.


Abstract

This study investigated the potential mechanism of single Gua Sha therapy on thoracolumbar fascia thickness and related physiological parameters. Sixty-six healthy individuals participated, and they were randomly assigned to one of two groups: a 15 min Gua Sha group or a 15-min rest control group. Thoracolumbar fascia thickness, pressure pain threshold, tissue hardness, skin temperature, lumbar spine flexibility, stress index, and heart rate variability were assessed before and immediately after the interventions. The results revealed a significant reduction in thoracolumbar fascia thickness in the Gua Sha group (Left side: a reduction of 0.06 mm, p < 0.05, effect size 0.14; Right side: a reduction of 0.09 mm, p < 0.05, effect size 0.22). Skin temperature was significantly increased (mean difference: 0.66°C, 95% CI: 0.59, 0.72, p < 0.001) and lumbar flexibility was also improved (mean difference: 0.56cm, 95% CI: 0.30, 0.82, p < 0.01) between the groups, suggesting a softening effect of Gua Sha on the fascia. However, contrary to the hypothesis, the Gua Sha group showed a decreased pressure pain threshold and increased tissue hardness. Both interventions effectively reduced the stress index and enhanced heart rate variability, although there were no significant differences between the groups (p > 0.05). In conclusion, this study found that a single session of Gua Sha therapy could induce a subtle but significant reduction in thoracolumbar fascia thickness and improve specific physiological parameters in healthy individuals, but the unexpected findings regarding the pressure pain threshold and tissue hardness require further investigation to elucidate the underlying mechanisms, offering insight into Gua Sha’s possible mechanisms.


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