(Consumer Reports) - Hot yoga classes are soaring in popularity. A number of celebrities, including Lady Gaga and Madonna, swear by hot yoga. So do legions of yoga practitioners. But many of the hot yoga classes require heat of at least 105F and humidity around 40 percent.

Is exercising in extreme heat and humidity healthful?

Consumer Reports medical experts have a caution.

Though there is little specific research on hot yoga, we do know that exercising in extreme heat can cause a number of uncomfortable and even dangerous symptoms.

It can lead to heat exhaustion or heat stroke.

Warning signs include feeling lightheaded or dizzy, or experiencing nausea or muscle cramps.

If you suffer more serious symptoms either during or after class, such as unusual weakness, fever, vomiting, or confusion, Consumer Reports advises going to the nearest emergency room.

Bikram hot yoga practitioners say the high temperature and humidity promote health.

Studio owner Rich Pike says he hasnt had complaints of heat exhaustion and touts the benefits.

He says, Heat allows you to bend safely and be more flexible. What the sweating does is it eliminates toxins through your sweat.

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Hazards of hot yoga: Consumer Reports