Episode 18

The truth and science behind Hot Yoga

Long form discussion into the truth about Hot Yoga. Find out the real science and benefits.

Is the Heat Worth It? Diving Deep into the World of Hot Yoga 🔥

Hot yoga, a popular and increasingly common form of exercise, takes traditional yoga practice and turns up the heat. Typically performed in rooms heated to between 90 and 105 degrees Fahrenheit (35°C to 41°C), often with 40-60% humidity, this intense environment aims to replicate the climate of India, where yoga originated. While hot yoga offers many benefits similar to traditional yoga, the added heat can intensify the experience and introduce unique considerations.

The Benefits: Why Turn Up the Temperature?

Practitioners are drawn to hot yoga for a variety of reasons, reporting numerous physical and mental benefits:

  • Enhanced Flexibility: The elevated temperature helps to warm and loosen muscles, similar to an active warm-up. This can potentially allow for deeper stretches and an increased range of motion. One study noted that sauna yoga at 122°F (50°C) significantly improved flexibility in healthy older adults.
  • Strength and Bone Density: Many yoga postures involve supporting your own body weight, which can help build functional strength and improve bone mineral density. A 2014 study found that premenopausal women who practiced Bikram yoga over five years saw increased bone density in their neck, hips, and lower back, suggesting it may help reduce the risk of osteoporosis.
  • Cardiovascular Boost: The heated environment increases the cardiovascular demand, making your heart, lungs, and muscles work harder, which can provide a more intense workout. Some research indicates that a single hot yoga session can elevate your heart rate to levels comparable to a brisk walk. However, a 2018 study found that while both hot and normal-temperature yoga improved vascular health, there was no significant difference between the heated and unheated groups, suggesting the cardiovascular benefits largely stem from the yoga postures themselves, not the heat.
  • Stress Reduction and Mental Well-being: Like all yoga, hot yoga is known for its ability to reduce perceived stress, anxiety, and symptoms of depression, improving overall mental health and quality of life. Regular yoga practice can decrease stress-associated hormones and chemicals like cortisol and has been linked to increased well-being and stress resilience. Research indicates that neurological benefits, such as increased brain-derived neurotrophic factor (BDNF), are associated with yoga practice independent of environmental temperature.
  • “Detoxification” through Sweating: Many proponents suggest that profuse sweating in hot yoga helps to “purge toxins” from the body, giving internal organs like the kidneys and liver a break. It’s important to note that sweat is primarily water and salts, and the body’s primary mechanisms for detoxification are the liver and kidneys.
  • Skin Nourishment: The increased circulation from the heat may deliver more oxygen and nutrients to skin cells, potentially improving skin quality and activating sirtuin family genes which can counteract signs of skin aging.
  • Improved Hydration Habits: The necessity to hydrate before, during, and after a hot yoga class can encourage better overall water intake habits.
  • Improved Breathing and Asthma Symptoms: Deep breathing in a humid room can relieve asthmatic symptoms.

Important Considerations and Potential Risks

While the benefits are appealing, hot yoga is not without its considerations and potential risks:

  • Dehydration and Electrolyte Imbalance: Profuse sweating in a heated environment can lead to significant fluid and electrolyte loss. This can result in dehydration, which can be dangerous.
  • Overstretching and Injuries: The sensation of increased flexibility due to warmed muscles can make it easier to overstretch ligaments and tendons, potentially leading to injuries. It’s crucial to distinguish between discomfort and sharp pain.
  • Heat-Related Illness: Risks include heat cramps, heat exhaustion, and heat stroke, especially if core body temperature rises to unsafe levels (e.g., nearing 104°F/40°C).
  • Hygiene Concerns: The hot and humid environment is conducive to bacterial and fungal growth, increasing the risk of skin infections if personal and studio hygiene are not rigorously maintained.
  • Contraindications: Hot yoga is generally not recommended for pregnant women, individuals with heart conditions, certain forms of diabetes, low blood pressure, low blood sugar, a history of fainting, or heat intolerance. Some sources also advise caution for individuals with multiple sclerosis, as heat can exacerbate symptoms. Always consult a healthcare professional before starting any new exercise regimen, especially hot yoga, if you have pre-existing health conditions.

Hot Yoga vs. Bikram Yoga: Understanding the Distinction

It’s important to differentiate between general “hot yoga” and “Bikram yoga”:

  • Bikram Yoga is a highly specific and unchanging practice, named after its founder, Bikram Choudhury. A true Bikram class consists of a 90-minute session featuring a set sequence of 26 Hatha yoga postures and two breathing exercises, performed in a room heated to precisely 105°F (41°C) with 40% humidity. Instructors typically talk you through the flow without demonstrating moves, to encourage listening and being in the moment. The name “Bikram” has been largely removed from many studios due to various controversies surrounding its founder.
  • General Hot Yoga is a broader category of yoga performed in heated rooms, where temperatures typically range from 85 to 105°F (29.4–40.5°C). Unlike Bikram, the postures and sequences can vary depending on the instructor, and classes may include music and more interaction. Other hot yoga styles include Vinyasa yoga, Moksha yoga (or Modo yoga), CorePower yoga, Forrest yoga, Hot Power yoga, and Hot Yin yoga.

Safety Tips for Your Hot Yoga Journey

If you decide to try hot yoga, here are some essential safety tips:

  • Hydrate Generously: Drink plenty of water and potentially electrolyte-rich fluids before, during, and after class to prevent dehydration.
  • Dress Appropriately: Wear lightweight, breathable, moisture-wicking fabrics that allow sweat to evaporate.
  • Bring a Towel: A towel for your mat and body is essential due to the profuse sweating. You can find full-length yoga towels designed for this purpose.
  • Listen to Your Body: It’s understandable to want to push through, but if you feel dizzy, lightheaded, or experience sharp pain, sit down, take a break, and focus on breathing through your nose. There’s no need to force a posture.
  • Time Your Meals: Avoid eating a heavy meal at least two hours before class. A light snack like half a banana or applesauce might be acceptable closer to class, but experiment to see what works for you.
  • Start Slowly: If you’re new to yoga, consider taking a traditional or beginner-friendly hot yoga class first to familiarize yourself with the movements and the heat. Some studios offer foundational classes.
  • Communicate with Your Instructor: Let your teacher know if you have any injuries or health concerns so they can provide appropriate guidance.

Ultimately, the best form of yoga is the one you can practice safely, consistently, and enjoyably, aligning with your individual goals and health profile. Always consult a healthcare professional before starting any new exercise, especially hot yoga, if you have pre-existing health conditions.

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