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 Based on 37 clinical trials, researchers found that doing yoga
lowered blood pressure, cholesterol, heart rate and other
cardiovascular risk factors in increments comparable to those seen
with aerobic exercise.
“Taken together, these improvements could facilitate and complement
a regimen toward better cardiovascular health,” said Paula Chu, a
doctoral candidate in health policy at Harvard University in
Cambridge, Massachusetts, who led the study.
She and her co-authors caution in the European Journal of Preventive
Cardiology, however, that larger studies are needed to understand
how yoga improves health, how much of it is ideal and if there are
differences in benefits from various types of yoga before the
practice becomes a standard prescription for heart disease.
Nonetheless, yoga’s benefits have been long suspected, said Dr.
Larry Phillips, a cardiologist at NYU Langone Medical Center in New
York.
“I think what we’ve seen is with yoga and the relaxation and
behavior modification that goes along with it, there is a benefit to
all patients, but especially those with heart disease,” said
Phillips, who was not involved in the new analysis.
“Here we are able to see there are more measurable benefits than
we’ve seen before,” he told Reuters Health.
Yoga originated in India more than 5,000 years ago, and has become a
popular mind-body therapy in the West. Yoga’s breath control and
body postures are believed to help nourish self-awareness, control
stress and develop physical strength and balance.
The more traditional Hatha style of yoga is the most widely
practiced in the U.S. But many specialized yoga “products,” such as
hot yoga, power yoga and yoga retreats are part of a billion-dollar
yoga industry.
One study estimates that 15 million Americans have practiced yoga at
least once, according to Chu and her co-authors.
They focused on yoga’s effects on cardiovascular disease, as well as
risk factors including high blood pressure, high blood sugar, excess
abdominal fat and abnormal cholesterol levels that make up a profile
- known as metabolic syndrome – that often leads to heart disease
and diabetes.
The study team analyzed 37 randomized, controlled trials involving
2,768 people through December 2013. The trials either looked at yoga
compared to no exercise or to aerobic exercises. Participants’
average age was 50 and they were followed for anywhere from 12 weeks
to one year.
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Those who did yoga had significant improvements in a range of risk
factors. Systolic blood pressure (the top number) dropped by an
average of 5.21 mm Hg, and diastolic pressure (the bottom number)
dropped 4.9 mm HG. LDL “bad” cholesterol fell by an average 12.14
mg/dl and HDL “good” cholesterol rose by an average 3.20 mg/dl.
Average heart rate was lower by a little over 5 beats per minute and
weight loss averaged a bit over 5 pounds.
These changes were similar to the improvements seen among people who
did aerobic exercise instead.
There were no changes, though, in fasting glucose levels or A1C, a
measure of long-term blood sugar control in diabetics.
Chu and her colleagues note that one weakness of the results is that
the analyzed trials included various types of yoga that were
practiced for different amounts of time. These included Silver yoga
(for seniors), Iyengar yoga (a form of Hatha that emphasizes correct
postures), Viniyoga (which includes chanting) and Vinyasa
(breath-synchronized movements.)
There were also a wide range of populations, from the young and
healthy to older people with histories of heart disease, Chu told
Reuters Health.
“We are not recommending anyone ditch their medicines or established
medical or physical practices,” she said. “Individuals can talk to
their doctors about whether yoga is a viable option for them.”
Yoga classes may be offered at health clubs, spas, senior centers
and in other settings. Individual classes at stand-alone yoga
centers tend to range from $15 to $30.
Phillips said he encourages his patients to develop a healthy
lifestyle and exercise regimen, which could include yoga. He urges
people to find a class that is appropriate for their comfort level
and ability.
“I think the effects of relaxation do decrease stress levels and
have a benefit to the heart,” said Phillips, adding that he had
found doing yoga boosted his own mood and energy level.
SOURCE: http://bit.ly/1GXfPdi European Journal of Preventive
Cardiology, online December 15, 2014.
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