Changes in heart-rate variability of survivors of nasopharyngeal cancer during Tai Chi Qigong practice.

Author: Fong SS1, Wong JY2, Chung LM3, Yam TT4, Chung JW3, Lee YM5, Chow LP3, Luk WS6, Ng SS7.
1Institute of Human Performance, The University of Hong Kong: Pokfulam, Hong Kong. 2School of Nursing, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong. 3Department of Health and Physical Education, Hong Kong Institute of Education, Hong Kong. 4Department of Physiotherapy, David Trench Rehabilitation Centre, Hong Kong. 5Polar H.K. Ltd., Hong Kong. 6The Association of Licentiates of the Medical Council of Hong Kong, Hong Kong. 7Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong.
Conference/Journal: J Phys Ther Sci.
Date published: 2015 May
Other: Volume ID: 27 , Issue ID: 5 , Pages: 1577-9 , Special Notes: doi: 10.1589/jpts.27.1577. , Word Count: 219

[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.
Autonomic nervous system; Head-and-neck cancer; Mind-body exercise
PMID: 26157266 [PubMed] PMCID: PMC4483444