Hot Yoga

An RCT involving 290 people found improved peace of mind (b = 0.23, p = .001, ΔR2 = .02). An RCT involving 32 people also reported improved mental health, but another RCT involving 32 people found no statistically significant condition-by-time differences for its secondary outcomes, so the results are mixed.

An RCT with 290 participants found higher mindfulness scores among people practicing hot yoga than among those in a waitlist group. Findings differ: an RCT with 32 participants found no significant changes in trait or state mindfulness scores in the yoga group.

In an RCT with 22 participants, VO2 max in the hot-yoga group rose from 3.22 ± 0.76 L/min to 3.46 ± 0.79 L/min; it did not change significantly in the comparison group. A separate RCT found no change in maximal aerobic fitness.

In an RCT with 52 healthy participants, body-fat percentage measured by dual-energy X-ray absorptiometry was lower after the intervention in the hot-yoga group than in the thermoneutral-yoga and control groups. In another RCT with 63 participants, higher attendance was associated with reductions in body-fat percentage.

In an RCT involving 53 people, response rates were 61.1% with Hot Yoga and 6.7% with a waitlist. However, a pooled analysis of randomized and non-randomized human studies involving 53 people in its depressive-symptom analysis found Hot Yoga no better than traditional aerobic exercise for attenuating depressive symptoms.

A quasi-experimental study with 53 participants found decreases in state anxiety after a 90-min Bikram Yoga session, with changes related to perceived stress. A pilot study with 28 participants also reported reduced anxiety, while an RCT with 32 participants found no statistically significant condition-by-time interaction for its secondary outcomes.

In a quasi-experimental study with 21 participants, balance time increased by an average of 228%, from 19.5 +/- 14 to 34.3 +/- 18 seconds; the control group did not change.

In an RCT involving 32 women, the Hot Yoga group showed improved physical functioning on an SF-36 subscale. A pilot study involving 28 people also reported improved cognitive/physical functioning (SMD 1.34).

An RCT with 32 participants found increased heart rate variability measured by SDNN. Findings differ: an RCT with 63 participants found no significant change in the high-frequency component of heart rate variability or in other secondary outcomes between groups.

An RCT with 52 participants found increased brachial artery flow-mediated dilation in the thermoneutral-yoga group. A quasi-experimental study found an increase among middle-aged and older adults, but not young adults.

A cohort study with 22 participants reported body-fat reductions of −3.71% at T1 and −6.07 at T3 compared with baseline. A separate quasi-experimental study with 42 participants found no significant changes in body mass or body-fat percentage after the intervention.

In a cross-sectional study of 700 people, drinking water during Hot Yoga was associated with not experiencing symptoms of dehydration; this association does not establish that drinking water caused the difference.

An RCT with 63 participants found improvement in the energy/fatigue domain of health-related quality of life in the experimental group compared with the control group.

In an RCT with 63 participants, higher attendance was associated with reduced diastolic blood pressure. A separate RCT with 14 participants found that blood-pressure responses were unaltered by the intervention.

A quasi-experimental study with 42 participants found reduced insulin resistance in older adults, but not in young adults.

A pilot study involving 28 people reported improved cognitive/physical functioning (SMD 1.34). In contrast, a pooled analysis of randomized and non-randomized human studies involving 32 people in its analysis found no changes in inhibitory control, cognitive flexibility, or working memory compared with a wait-list control group.

A review of randomized and non-randomized human studies reported that long-term Bikram Yoga practice was associated with bone mineral density increases of 7% at the femoral neck, 2% at the total hip and 1% at the lumbar spine.

A pilot study involving 13 healthy people found that Hot Yoga was associated with a -25% faster return to sleep after waking during the night.

A pilot study with 29 participants found a reduced area under the glucose curve after an oral glucose tolerance test in older adults with obesity, but not in young, lean participants.

Expert commentary suggests Hot Yoga may improve joint comfort and mobility in people with mild-to-moderate osteoarthritis when practiced with proper alignment. Community members have also reported this effect, but these are personal accounts.

Bikram Yoga's sequence of postures emphasizes spinal alignment and core engagement, which may improve posture over time. The effect was mentioned in 5 of 312 Reddit reports discussing it.

Expert commentary suggests Hot Yoga may lead to modest increases in lean muscle mass through prolonged isometric contractions against body weight in a heated environment. A small number of community members have also reported this effect; these are personal accounts.

In a qualitative study, 13 of 80 participants reported improved energy. An RCT with 32 participants found no statistically significant condition-by-time interactions for its secondary outcomes.

Yoga practices, including hot yoga, have been associated with reduced inflammatory markers such as CRP and IL-6, though direct evidence for Bikram Yoga specifically is limited.

Sweating during hot yoga may support the elimination of trace heavy metals and organic toxins through the skin, though the clinical significance remains uncertain.

An RCT with 32 participants found no statistically significant condition-by-time interactions for its secondary outcomes.

A pilot study with 13 participants found no significant changes in subjective or objective sleep latency or total sleep time after Bikram Yoga.

Human studies have not demonstrated an analgesic effect from Hot Yoga.

Human studies have not demonstrated increased fat burning from Hot Yoga.

Human studies have not demonstrated improved oxygen utilization from Hot Yoga.

An RCT with 21 participants found no changes in cardiovascular measures after the intervention.

Human studies have not demonstrated improved thermoregulation from Hot Yoga.

Human studies have not demonstrated improved heat tolerance from Hot Yoga.

A randomized trial did not support an effect: after 6 weeks, 32 women screening positive for adult ADHD showed no significant group-by-time interactions for executive function, mood, mindfulness, or motivation compared with a waitlist.

A quasi-experimental study found that six days of hot yoga initiated a moderate state of hypovolemia (PV% = -3.5%, 90% confidence limit [-6.9 to -0.13]) in 10 people. A 2017 cross-sectional study of 700 also reported dehydration.

A 2025 systematic review of randomized and non-randomized human studies described a single case of sudden cardiac arrest during hot yoga in a 35-year-old female.

A 2025 systematic review of randomized and non-randomized human studies described a single case of psychosis, including hallucinations and paranoia, during a Bikram yoga instructor training program.

A 2019 randomized controlled trial involving 32 people recorded post-class muscle soreness and recovery time that was too great.

A 2017 cross-sectional study of 700 recorded muscle cramps. A separate 2012 case report described severe muscle cramps after a workout alongside breathlessness, nausea and malaise.

A 2019 trial reported exercise-triggered persistent pain; a 2017 trial reported worsening of pre-existing back, foot, knee, or calf pain, as well as psychological discomfort.

A 2017 cross-sectional study of 700 reported headache.

A 2017 cross-sectional study of 700 reported heatstroke.

A 2017 cross-sectional study of 700 reported confusion.

A 2012 case report described a tonic-clonic seizure.

Excessive exertion in heat, especially in unconditioned individuals, can damage skeletal muscle and release myoglobin, creating a risk of acute kidney injury.

Blood pressure can rise temporarily during sessions as thermal stress and vasoconstriction affect the body, particularly in the early heat-adaptation phase.

Heavy sweating is expected in a heated room and causes fluid and sodium loss, which can lead to dehydration or hyponatremia if those losses are not replaced.

Repeated sweating without adequate fluid intake can cause chronic dehydration, increasing urinary concentration and the risk of calcium oxalate stone formation.

In susceptible people, rising body temperature and sweating in a hot room can trigger heat-induced hives (cholinergic urticaria).

Heat can make muscles and joints feel looser than they are, so deep stretching in a hot room may overstretch tendons.

Warm muscles and ligaments may allow deeper stretches than joints can safely tolerate, which can cause overstretching and strains, especially of the hamstrings.

A 2017 randomized controlled trial involving 63 healthy participants excluded pregnancy because Bikram Yoga was considered potentially hazardous. The trial therefore does not establish safety during pregnancy.

Heat stress and increased sympathetic activity during Hot Yoga may trigger or worsen arrhythmias, particularly in people with long QT syndrome or atrial fibrillation.

The cardiovascular demands of heat and exercise may be dangerous for people with unstable angina, a recent heart attack, or uncontrolled heart failure.

Uncontrolled high blood pressure may increase the risk of cerebrovascular events when heat-related blood-vessel widening and increased cardiac output occur during Hot Yoga.

Heat exposure can temporarily worsen neurological symptoms in many people with multiple sclerosis, a response known as Uhthoff's phenomenon.

Increased metabolic rate and heat intolerance may heighten the risk of heat exhaustion and a rapid heart rate during Hot Yoga.

After a stroke, impaired temperature regulation and autonomic control can increase vulnerability to heat stress and unstable blood pressure during Hot Yoga.

With decompensated or poorly controlled heart failure, the demands of heat-related blood-vessel widening, sweating, and sustained exertion can contribute to worsening heart failure and fluid or electrolyte shifts.

Heat and exertion can strain the heart during recovery after a heart attack; the rationale indicates that exercise during this phase should be medically supervised and at a controlled temperature.

Heat-related blood-vessel widening and fluid loss, combined with quick posture changes or forward folds, can further lower blood pressure and lead to fainting or falls in people prone to postural drops.

Exercising in a hot room during a fever adds heat load to an already elevated core temperature and can worsen dehydration and dizziness.

After a recent heat-illness episode, or with current heat intolerance, impaired temperature regulation may raise the risk of recurrence during sustained exertion in a 40°C room.