HNSE-L1-1. Validation of Sweat Rate, Fluid Loss, and Sodium Loss in Wearable Technology

Macy Helm1
Bryson Carrier1
Faculty Mentor: James Navalta, Ph.D.1
1School of Integrated Health Sciences, Department of Kinesiology and Nutrition Sciences

Sweat rate, fluid loss, and sodium loss directly impact performance during prolonged exercise bouts. The Gatorade Gx Sweat Patch (Gx SP) is a wearable device that tracks these metrics in the user. Having this information allows athletes to strategize their fluid and electrolyte consumption. This randomized and counterbalanced study will determine the validity and accuracy of the Gx SP’s prediction of sweat rate, fluid loss, and sodium loss compared to lab-based measurements. Healthy runners and basketball players will be recruited to participate in two running sessions on a treadmill. Participants will be asked to run at low-intensity and moderate-intensity, determined by heart rate reserve. Hydration status and sodium loss will be determined pre-and post-exercise via body weight, bioelectric impedance analysis (BIA), and urine and blood samples. While running, the participant will wear the Gx SP, an additional absorbent gauze pad, and a heart rate (HR) monitor. Running intensity will be monitored by HR and corresponding HRR values. After completing the exercise, sweat rate, fluid loss, and sodium loss will be generated via the Gx SP. The absorbent gauze will be analyzed for sodium loss. Body weight and blood and urine samples will be obtained again and compared to the pre-test samples. Participants will return within 2 to 14 days to complete the opposite running condition. To determine the validity of the device, the validation criteria for the Gx SP is: p > 0.05, mean absolute percentage error < 10.0%, Pearson Correlation > 0.70, and Lin’s Correlation Coefficient Concordance > 0.70.


Nov 15 - 19 2021


All Day


HNSE: Lightning Talk Session 1
The Office of Undergraduate Research


The Office of Undergraduate Research


11 Replies to “HNSE-L1-1. Validation of Sweat Rate, Fluid Loss, and Sodium Loss in Wearable Technology”

  1. Hello Macy,
    I was very intrigued by your topic validation of sweat rate, fluid loss, and sodium loss in wearable technology as well as being someone who wears in Technology wear quite often very curious. I look forward to following up with your study!

    Nicholas Arechiga

  2. Hello Macy,
    I enjoyed your lightning talk. I was curious about when you mentioned urine specific gravity, what about it helps determine your hydration status? Also will the participants be required to drink water or Gatorade before or after to they run to determine their hydration status as well? I found this very interesting because I’m the type of person who sweats a lot, my body is always trying to cool me down. I do drink a lot of water but I do feel dehydrated all the time.

  3. Hey Macy,
    I really enjoyed your presentation! As a student athlete myself, I found this lightning talk very informative for me. One thing that we stress is our hydration and electrolyte intake plan and you hit in right on the nail on how important this is for an athlete to compete at an optimal performance. Thank you for this!

  4. Hello Macy,

    great presentation, you are very well spoken during your presentation. You were also able to provide good information that helped me understand the basis of your research. I did not know that Gatorade was coming out with this Gx sweat patch, this technology seems like it is similar to the whoop, except it tries to help you optimize performance by tracking hydration. I was curious as to the range of people who you would conduct the research on to be, could it be conducted on an average person who consistently runs at the gym or a student who goes the the UNLV gym to play basketball? I look forward to your research to see the validity of the Gx sweat patch.

    1. Hi Jacob,

      Great question! We plan to recruit from the general population, but to be eligible in the study, participants must regularly engage in physical activity (participate in at least 30 min per week, 3x per week for the last 3 months) and be comfortable running up to 65 minutes. We will not qualify people based on aerobic fitness, so hopefully, we will have a representative sample from the general population that does engage in physical activity. We also will be recruiting from the women’s basketball team. Students who run at the gym and/or regularly play basketball (male and female) are more than welcome to volunteer for the study assuming they meet our other eligibility criteria.

      Thanks for watching!

  5. Nice presentation!
    I did not realize that sodium plays a part in a person’s athletic abilities until I watched this presentation.
    Thank you for teaching me something new!

  6. Hello everyone and welcome to my lightning talk. Feel free to ask questions and/or provide feedback in the comment section.

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