ACE STUDY FINDS NO DANGER IN MANY HOT YOGA CLASSES
H
Approximately 300,000 people in the
U.S. go into cardiac arrest every year and about 90 percent of those die, according to the Centers for Disease Control and Prevention (CDC). Quick use of an AED, however, can in-
crease a person's chance of survival. For example, the CDC has found that
Proper hydration and managed temperatures key to ensuring safety Association in 2002 encouraged all
about one in 10 people who go through cardiac arrest survive to be released from the hospital, but that rate climbs to one in three among those who were shocked by an AED during cardiac arrest. The American College of Sports Medicine and the American Heart
health and fitness facilities to have AEDs available, because the risk of cardiac ar- rest increases during and immediately nationwide. However, the question f don't regularly exercise.
ot yoga is indeed a hot trend with escalated temperatures permeating many yoga studios
aſter physical activity among those who safe y is often d bated as it relates to dehydration, heat exhaustion and leagues used registries in the state of Washington to see how many cardiac ar- rests occurred in public indoor locations between 1996 and 2008.
For the new study, Page and his col- muscle damage with room tempera- tures ranging from 90 to 105 degrees. In a new independent study com- missioned by American Council on Exercise (ACE), r searchers found no dn't include information about their locations. Of the remaining 849, 52 oc- curred at fitness or health clubs and 84 at alternative exercise facilities, includ- ing bowling alleys, ice arenas and ten- nis facilities. The other cardiac arrests occurred in other public indoor spaces, such as community centres.
Based on these data, the researchers sweat levels may cause participants to feel like they were working harder, heart rates showed they were actual- ly at comparable levels whether in the regular or hot yoga class.”
Bryant also noted that while the
community centres. What's more, 56 percent of people
who went into cardiac arrest in fitness facilities survived compared to 45 per- cent in the alternative exercise facilities and 34 percent in the other indoor public spaces. But those rates, say the researchers
write, may not apply to the rest of the country because King County is known for its fast emergency response times and high survival rates for cardiac arrests.
The lower incidence and higher surviv-
al rates at fitness clubs may also be par- tially explained by selection bias because the people at those facilities may be healthier than those at bowling alleys. "If you look at the individual sites
where these are occurring, if you are put- ting them in fitness clubs, you should re- ally be putting them in other places," said Page
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Overall, there were 865 cases and 16 diifference in the increase in core tem- perature or heart rate between 60-min- ute regular yoga and hot yoga classes. “Anytime exercise is conducted in extreme temperatures, it’s important to remain hydrat d and to w tch signs for overheat ng,” said ACE Chief Science Offi cer Dr. Cedric Bryant. “However, this study showed that while higher
study conducted tested a hot yoga class with an average temperature of 92 de- grees, many hot yoga classes including the popular Bikram yoga, are conduct- ed in temperatures of 105 degrees or higher for longer durations and there- fcore need to be studied further. of survival until a defibrillator is used. mu"scular strength and endurance to fl exibility and balance, in addition to t the same time one life is worth one life," said Meldon.
found that a fitness club's employees can expect to respond to one cardiac arrest every 42 years. That compares to one case every 11 years at a tennis facility, one case every 13 years at an ice arena and one case every 27 years in a bowl- ing alley. Dr. Stephen Meldon, vice chair of the Cleveland Clinic's Emergency Services Institute, s id those facilities with higher rates may want to consider getting AEDs and training their staff in CPR which in- reases a cardiac arrest victim's chance “Yoga has signifi cant benefi ts – from If you look at the annualized rates,
they're still not remarkably frequent, but i ats mind-body value,” said Bryant. “For those looking to participate in hot yoga of any kind, it’s important to properly percent of cardiac arrests at fitness and health centres were treated with CPR and publicly accessible AEDs, compared to 25 percent at the other sports facilities and
Page a d his colleagues found that 83 hydrate before, during, and after class while also monitoring for early signs or symptoms of heat intolerance (e.g., headache, muscle cramps, naus a, dizzi- ness, or fatigue).”
September/October 2013 Fitness Business Canada 11
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