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Title: Changes in heart-rate variability of survivors of nasopharyngeal cancer during Tai Chi Qigong practice
Authors: Fong, SSM
Wong, JYH
Chung, LMY
Yam, TTT
Chung, JWY
Lee, YM
Chow, LPY
Luk, WS
Ng, SSM 
Keywords: Autonomic nervous system
Head-and-neck cancer
Mind-body exercise
Issue Date: 2015
Publisher: Society of Physical Therapy Science (Rigaku Ryoho Kagakugakkai)
Source: Journal of physical therapy science, 2015, v. 27, no. 5, p. 1577-1579 How to cite?
Journal: Journal of Physical Therapy Science 
Abstract: [Purpose] To explore the changes in heart-rate variability (HRV) of survivors of nasopharyngeal cancer (NPC) before, during, and after a Tai Chi (TC) Qigong exercise. [Subjects and Methods] Eleven survivors of NPC participated voluntarily in the study. The heart rate of each participant was measured continuously for 1 minute before the TC Qigong intervention, during the 5-minute TC Qigong intervention, and for 1 minute after the intervention, using a Polar heart-rate monitor. Spectral HRV was expressed in terms of normalised low frequency (LF) power, normalised high frequency (HF) power, and the low frequency/high frequency (LF/HF) power ratio. [Results] Both the LF-power and the HF-power components had significant time effects. However, the time effect of the LF/HF power ratio was not significant. Post hoc contrast analysis revealed a significant decrease in LF power and a concomitant increase in HF power during the 4th minute and 5th minute of the TC Qigong exercise. [Conclusion] Five minutes of TC Qigong exercise was found to improve HRV by increasing HF power and decreasing LF power, but these effects were transient. TC Qigong might be an appropriate exercise for improving the ANS function and psychological and cardiac health of survivors of NPC.
ISSN: 0915-5287
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