Fluid Intake and Sweat Rate During Hot Yoga Participation

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Department or Administrative Unit

Nutrition Exercise and Health Sciences

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Hot yoga participants are at risk for dehydration due to the nature of the environment they exercise in. Therefore, the purpose of this study was to investigate the pre-exercise hydration status, fluid balance, perception of sweat loss, and sweat sodium loss in 21 male and female hot yoga participants (mean age ± SD, 33.0 ± 10.5 yr; mass, 70.7 ± 11.0 kg). Data was recorded pre and post a one- hour hot yoga class (38.7 ± 2.6 °C, 36 ± 13% relative humidity). Pre-exercise urine specific gravity (USG), hydration status, body mass changes, and fluid intake were recorded and sweat rate was calculated. Sweat sodium concentration was examined using sweat patches, and each participant reported their perception of sweat loss. A paired t test was used to identify significance between measured and perceived sweat loss and Pearson’s correlation analyses were used to assess relationships between variables. Seventy six percent of participants began hot yoga euhydrated (USG < 1.020). Sweat rate was 0.9 ± 0.6 L·h-1. Despite free access to fluids during class, consumption was low (0.2 ± 0.2 L·h-1) and 33% did not consume any fluids. Consequently, mean percent body mass loss was 0.9 ± 0.6% and about half of the participants lost at least 1% of body mass. Participants underestimated perception of sweat loss (p = 0.01). Mean sweat sodium concentration was 49.1 ± 19.2 mmol·L-1. Findings from this study highlight the individual variability that occurs in hydration management in yoga participants and the need for personalized hydration guidelines.


This article was originally published in International Journal of Exercise Science. The full-text article from the publisher can be found here.


International Journal of Exercise Science

Creative Commons License

Creative Commons Attribution-No Derivative Works 4.0 International License
This work is licensed under a Creative Commons Attribution-No Derivative Works 4.0 International License.