CLINICAL RESEARCH POSTER PRESENTATION ABSTRACTS
Please note: All posters will be displayed in
Salons 10-12.
THURSDAY, 5:30-6:15 PM
Taylor-Piliae RE, Haskell WL, Sivarajan ES.
Blood pressure, heart rate and aerobic endurance in response
to tai chi exercise in ethnic Chinese with cardiovascular disease risk
factors.
Stanford Prevention Research Center, School of
Medicine, Stanford University rpiliae@stanford.edu
BACKGROUND: Physical activity reduces cardiovascular
disease (CVD) risk factors. Reduction in blood pressure (BP) in response
to Tai Chi exercise (TCE) in persons with CVD risk factors have been
reported, though not in ethnic Chinese living in the United States (US).
Objective: Test hemodynamic responses to TCE.
METHODS: Quasi-experimental design. Ethnic Chinese
> 45 years old with at least 1 major CVD risk factor, living in the
San Francisco Bay Area, attended a TCE intervention 3x/week for 12 weeks.
A 2-minute step-in-place test assessed aerobic endurance. BP and heart
rate were measured at rest, and within 1-minute after the step-test.
Data were collected at baseline, 6 and 12-weeks.
RESULTS: A total of 39 subjects (69% women),
66 ± 8.3 years old, with hypertension (92%), hypercholesteremia (49%),
and/or diabetes (21%), and 1 current smoker participated. Adherence
to the intervention was high (87%). Table 1 shows clinically and statistically
significant reductions in BP at rest and after the step-in-place test,
over 12-weeks of TC. Subjects were sedentary at baseline, though had
a statistically significant improvement in aerobic endurance over-time.
No significant change in heart rate was observed.
CONCLUSIONS: This innovative, culturally relevant
12-week TCE program, appealed to Chinese adults with CVD risk factors;
had significant reductions in BP and improvement in aerobic endurance.
Given the high prevalence and public health burden associated with high
BP among adults, this finding is important since it offers an alternative
to risk reduction. Use of a RCT design is now needed to rule-out spontaneous
improvements.
TABLE 1: HEMODYNAMIC RESPONSES OVER 12 WEEKS OF TAI
CHI EXERCISE, N=38
| HEMODYNAMIC RESPONSE |
Baseline Mean ± SD |
6-Weeks Mean ± SD |
12-Weeks Mean ± SD |
F [df2,36] |
p-value |
eta2 |
| AT REST |
|
|
|
|
|
|
| Systolic Blood Pressure |
150.0 ± 20.0 |
134.6 ± 17.8 |
131.1 ± 15.1 |
28.09 |
0.001 |
0.43 |
| Diastolic Blood Pressure |
85.8 ± 9.3 |
77.6 ± 9.1 |
76.9 ± 8.4 |
23.85 |
0.001 |
0.39 |
| Heart Rate |
75.9 ± 14.6 |
74.5 ± 12.8 |
73.6 ± 11.7 |
0.97 |
0.384 |
0.03 |
| AFTER 2-MINUTE STEP-TEST |
|
|
|
|
|
|
| SYSTOLIC BLOOD PRESSURE |
178.3 ± 23.7 |
167.6 ± 25.2 |
164.3 ± 22.3 |
10.08 |
0.001 |
0.21 |
| Diastolic Blood Pressure |
98.8 ± 22.7 |
83.2 ± 12.6 |
81.6 ± 11.2 |
15.78 |
0.001 |
0.30 |
| HEART RATE |
92.2 ± 23.5 |
94.0 ± 21.9 |
91.1 ± 20.4 |
0.49 |
0.614 |
0.01 |
| AEROBIC ENDURANCE |
|
|
|
|
|
|
| Number of steps in 2-minutes |
73.0 ± 13.8 |
83.0 ± 18.3 |
88.3 ± 20.2 |
23.72 |
0.001 |
0.39 |
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