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Natcha Sawaengphak
Wipawadee Leemingsawat


Purpose The purposes of this study were to study and to compare acute effects of the self-massage and self-massage with Backnobber II on upper trapezius muscle fatigue in office workers.

Methods The subjects were 17 male and female office workers aged 25-45 years. All subjects received 3 conditions, self-massage (SM), self-massage with Backnobber II (BN), and resting (RT) on the chair. However each intervention on interval 7 days. The data, fatigue score was evaluated by numerical rating scale (NRS) and electromyography activities (EMG), were collected before and after the experiment. EMG was obtained during maximal voluntary contraction (MVC). All data was expressed as mean and standard deviation. Paired t-test was used to compare the measured variables between pre and post conditions. The results of were analyzed based on One-way ANOVA with Repeated Measures followed by as a Bonferroni post-hoc test. A statistical significance was set at p-value<0.05.

Results The mean fatigue score in both right and left upper trapezius muscle decreased significantly (p<0.05) in all of conditions. Additionally, the mean percentage of muscle contraction of both right and left upper trapezius muscle increased significantly (p<0.05) in all of conditions. After comparing all 3 conditions of experiments, the data revealed that the mean fatigue score and the mean percentage of muscle contraction of self-massage with and without Backnobber II was significantly different from resting on the chair.

Conclusions A Self-massage with and without Backnobber II on the upper trapezius for 15 minutes can reduce fatigue score and improve muscle contraction. Thus, it is likely that both self-massages should be suggested to improve muscle fatigue among office workers.

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How to Cite
Sawaengphak, N. ., & Leemingsawat, W. . (2019). THE ACUTE EFFECTS OF SELF-MASSAGING AND SELF-MASSAGING WITH BACKNOBBER II ON MUSCLE FATIGUE IN OFFICE WORKERS. Journal of Sports Science and Health, 20(2), 126–138. Retrieved from
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