'Exercise - just not in a hot environment': specialist on prenatal hot yoga

A health care specialist is advising pregnant womento stay away from hot yoga to avoid possible prenatal abnormalities. His warningcomes after a pregnant woman was kicked out of a popular London Ont. yoga studio.

• Pregnant midwife kicked out of yoga class for 'distracting' belly

"That level of heat and humidity may not be safe for the developing fetal brain in the second and third trimester and the entire developing fetus in the first trimester,"said Dr. Gregory Davies, the chair of Maternal-Fetal Medicine at Queen's University.

"We have lots of theoretic concerns why it would be unsafe and we have no evidence to say it is safe," said Davies, who clarified that current research is based off of animal models

His comments come after a pregnant London womanspoke out after being told by an instructor that hot yoga wasn't safe. The womansaid she was given agreen light by her own midwife to attend the classes.

Davies, who has studied exercise and pregnancy for more than two decades, said the studio did the right thing as prenatal concerns begin after a pregnant woman's core body temperature rises, similar to the way it would if a woman had a fever.

"I am certain that every hot yoga studio would react in the same way that this [one] did," he said. "Although a woman may choose to take those risks on herself, that doesn't mean that the proprietor of the hot yoga studio has to take those risks on as well."

Risk factors

Davies said possible complications for pregnant women could begin after their average body temperature exceeds 37 degrees as it could at a hot yoga classor in a hot tub.

In the first trimester, warmer body temperatures could increase the possibility of congenital abnormalities in the developing fetus as the organs are still forming. More specifically, an unborn baby may be proneto developing Spina Bifida, which is related to incomplete development of the spinal cord.

In the second and third trimester, a healthy growing fetus wouldalready havedeveloped organs, excluding the brain. Therefore, warmer temperatures may hinder the ability for the brain to develop normally.

Prenatal exercise

Davies recommends pregnant women exercise in mild environments such as at a traditional yoga studio or a gym, on stationary bikes or treadmills.

"Exercise in pregnancy is a very healthy part of pregnancy. Yoga is a wonderful exercise to deal with the aches and pains that come with the third trimester to stretch out your back and hips and your pelvis. It's an absolutely wonderful thing to do just not in a hot environment," he said.