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Abstract
Herbal Hot Pack Development using Microwave Oven
Nichapa Parasin*, Ajchamon Thammachai, Puttipong Poncumhak, Weerasak Tapanya
Division of Physical Therapy, School of Allied Health Sciences, University of Phayao, Phayao 56000,
Thailand.
*Corresponding auther: palmlittle.mudy@gmail.com

Rationale and Objective: Local Thai herbs can relieve pain and if they are applied with
superficial heat treatment, they may be an interesting alternative therapy for relieving pain. The
purpose of this study was to develop a Thai herbal hot pack that was heated in a microwave oven
and investigate the appropriate heat transfer and adequate duration for treatment.
Methodology: Forty healthy subjects aged 20-40 years were invited to participate in this
study. All the subjects were randomly allocated to an experimental group (n=20) and a control
group (n=20). The experimental group received Thai herbal hot pack treatment on the lower
back region for 30 minutes while the control group received hot pack physiotherapy. The inves-
tigator measured the change of skin temperature every minute for 30 minutes using a thermo-
meter. The difference in temperature between groups was analyzed using the independent t-test.
Results: There was a statistically significant difference between groups at 2 to 21 minutes
(p<0.05), and the microwave-heated Thai herbal hot pack was suitable as it could increase the
skin temperatures to 40-45 degrees Celsius for 20 minutes.
Discussion and Conclusion: The heat transfer and treatment duration of Thai herbal hot
pack by using microwave oven has a sufficient effect on the clinical treatment. Thus, the Thai
herbal hot pack can be an alternative method for treating the patients with chronic pain at home
because it is easy to use and can save the cost.

Keywords: Thai herbal hot pack, microwave oven, heat transfer