balance, tai chi, tai chi for seniors, tai chi health

Tai Chi and Knee Extensor Strength: Balance

Abstract:

Wu G, Zhao F, Zhou X, Wei L.

Improvement of isokinetic knee extensor strength and reduction of postural sway in the elderly from long-term Tai Chi exercise.

Arch Phys Med Rehabil 2002;83:1364-9.

Objectives: To compare isokinetic strength of leg muscles and foot center of pressure (COP) as a measure of sway between long-term Tai Chi practitioners and controls.

Design: Cross-sectional study.

Setting: Community setting. Participants: Twenty subjects in the Tai Chi group and 19 subjects in the control group (age, >55y).

Intervention: Subjects in Tai Chi group had practiced Tai Chi for a minimum of 3 years.

Main Outcome Measures: Concentric and eccentric strength of knee extensors and flexors at 60°/s and 120°/s, and foot COP displacement during quiet stance with eyes open or closed.

Results: People in the Tai Chi group had significantly higher knee extensor strength at all speeds tested (P<.013), and smaller foot COP excursions for both eyes open and eyes closed conditions (P<.05) than people in control group. No significant difference existed in knee flexors between the 2 groups (P<.713). The COP excursions correlated significantly with the eccentric strength of knee extensors (P<.07) but not with the concentric strength of knee extensors (P<.14) or with the isokinetic strength of knee flexors at most of the speeds (P<.27).

Conclusion: These findings support the hypothesis that the maintenance of eccentric strength of postural muscles in the lower extremities, which is beneficial for maintaining good postural stability, is helped through the long-term practice of Tai Chi.

© 2002 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation

via Elsevier: Article Locator.

tai chi health, tai chi immune system, tai chi shingles

Tai Chi and “The Shingles”.

Here’s the story about how practicing tai chi, along with getting vaccinated for “shingles” boosts immune system response to defend against vaicella zoster virus.  Tai Chi is reported to boost the immune system in general (reducing the effects of stress).

Augmenting Immune Responses to Varicella Zoster Virus in Older Adults: A Randomized, Controlled Trial of Tai Chi.

Journal of the American Geriatrics Society. 55(4):511-517, April 2007.

Irwin, Michael R. MD *; Olmstead, Richard PhD *; Oxman, Michael N. MD

Abstract:

OBJECTIVES: To evaluate the effects of a behavioral intervention, Tai Chi, on resting and vaccine-stimulated levels of cell-mediated immunity (CMI) to varicella zoster virus (VZV) and on health functioning in older adults.

DESIGN: A prospective, randomized, controlled trial with allocation to two arms (Tai Chi and health education) for 25 weeks. After 16 weeks of intervention, subjects were vaccinated with VARIVAX, the live attenuated Oka/Merck VZV vaccine licensed to prevent varicella.

SETTING: Two urban U.S. communities between 2001 and 2005.

PARTICIPANTS: A total of 112 healthy older adults aged 59 to 86.

MEASUREMENTS: The primary endpoint was a quantitative measure of VZV-CMI. Secondary outcomes were scores on the Medical Outcomes Study 36-item Short-Form Health Survey (SF-36).

RESULTS: The Tai Chi group showed higher levels of VZV-CMI than the health education group (P<.05), with a significant rate of increase (P<.001) that was nearly twice that found in the health education group. Tai Chi alone induced an increase in VZV-CMI that was comparable in magnitude with that induced by varicella vaccine, and the two were additive; Tai Chi, together with vaccine, produced a substantially higher level of VZV-CMI than vaccine alone. The Tai Chi group also showed significant improvements in SF-36 scores for physical functioning, bodily pain, vitality, and mental health (P<.05).

CONCLUSION: Tai Chi augments resting levels of VZV-specific CMI and boosts VZV-CMI of the varicella vaccine.

(C) 2007 by the American Geriatrics Society

via Journal of the American Geriatrics Society – Abstract: Volume 55(4) April 2007 p 511-517 Augmenting Immune Responses to Varicella Zoster Virus in Older Adults: A Randomized, Controlled Trial of Tai Chi..