The Effect of Internal Heat Acupuncture on the Tolerance Time of Plantar Hot Plate and Pain Threshold of Gastrocnemius Muscle in Rats with Chronic Myofascial Pain Syndrome

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Abstract Objective: To investigate the effect of internal heat acupuncture on the tolerance time of plantar hot plate and the pain threshold of gastrocnemius in rats with chronic myofascial pain syndrome (MPS). Methods: A total of 80 adult Wistar rats were randomly selected to establish chronic MPS rat models, and randomly divided into four groups: control group, acupuncture group, internal heat acupuncture group A, and internal heat acupuncture group B, with 20 rats in each group. The rats in the control group were not given any treatment, and the rats in the acupuncture group were only given acupuncture treatment. The rats in group A were treated with internal heat acupuncture (needle heating up to 42℃), and the rats in group B were treated with internal heat acupuncture (needle heating up to 44℃). The tolerance time of plantar hot plate, the pain threshold of gastrocnemius muscle and the level of tumor necrosis factor-α(TNF-α) were observed and compared before modeling, 1 d before treatment, and 1, 7 and 14 d after treatment. Results: There were significant differences in hot plate tolerance time, time and interaction among the four groups (P<0.05), as well as in gastrocnemius tenderness threshold, time and interaction among the four groups (P<0.05), and there were also significant differences in TNF-α level among the three groups (P>0.05). There were significant differences in the number of electric shocks, time and interaction among the four groups (P<0.05). Conclusion: In contrast to conventional acupuncture treatment, internal heat acupuncture demonstrates greater efficacy in extending the tolerance duration of hot plate exposure and enhancing the pain threshold of the gastrocnemius muscle in rats afflicted with myofascial pain syndrome. Additionally, it accelerates the amelioration of inflammatory markers and motor function. However, it is important to note that the therapeutic impact of internal heat acupuncture may be influenced by its temperature, with 44℃ being the most effective in this research.

Key words： myofascial pain syndrome(MPS) internal heat acupuncture plantar hot plate tolerance test gastrocnemius tenderness threshold animal experiments

Received: 05 June 2023

PACS:

R245.3

Corresponding Authors: CAI Na-li. E-mail:915438755@qq.com

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	CAI Na-li
	ZHOU Jian-ying
	WU Xian-yan

Cite this article:

CAI Na-li,ZHOU Jian-ying,WU Xian-yan. The Effect of Internal Heat Acupuncture on the Tolerance Time of Plantar Hot Plate and Pain Threshold of Gastrocnemius Muscle in Rats with Chronic Myofascial Pain Syndrome[J]. Chinese Journal of Biomedical Engineering, 2023, 32(3): 93-99.

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http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/ OR http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/Y2023/V32/I3/93

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