Sweat Sodium Concentration Testing


Sweat sodium testing is a combination of measuring your sweat sodium concentration (the amount of sodium in your body) and your sweat rate (how much fluid you lose during a workout).  This is a two-part process: 1) you measuring your sweat rate during a workout, and 2) your eNRG Performance Sport Dietitian measuring your sweat sodium concentration. We will then take all of the information (sweat rate and concentration) and package it in a customized manner that will provide you how much sodium you should consume per hour of training along with how much fluid to drink.

Please remember that eNRG Performance goes above and beyond in our athlete testing. Others may test sweat sodium concentration but provide you a general fluid consumption plan based on algorithms. At eNRG Performance, we don't like guessing. Not only do we provide you your accurate sweat sodium concentration, but we also provide you individual sweat rate information based on your body's fluid losses.

Part 1: Sweat rate testing

In the first part, you will be responsible for measuring your sweat rate and reporting that to your eNRG Performance Sport Dietitian.

Below are the instructions to determine your sweat rate prior to your appointment at eNRG Performance. The goal of measuring your sweat rate is to determine how much fluid your body loses during different workouts.  This provides your eNRG Performance Sport Dietitian important information that will be used to give you a customized sodium and fluid replacement plan.  Plan on doing this for a 1 hour workout.  We recommend repeating this sweat rate test throughout the year as your fitness and the environmental conditions change.

  1. You can have your normal meals and fluids before this test begins.

  2. Before your workout begins, finish any fluids you intend to drink if you do not plan to drink any during the workout.

  3. Use the bathroom to completely void your system.

  4. Weigh yourself nude. Record your pre-workout weight.

  5. Begin your workout as soon as possible. Aim for 60 minutes of exercise. It is okay to have a longer training session, but make note of the duration.

  6. Avoid using the bathroom during the workout. If you drink any fluids, stick to plain water (no added electrolytes) and note the amount of fluids you drink in ounces.

  7. As soon as possible after the workout, remove your clothes, towel off any sweat, and weigh yourself once more before using the bathroom. Note the post-workout weight.

  8. Email your eNRG Performance Sport Dietitian, Bob Seebohar, Heidi Strickler, or Jackie Robertson with this information.


Part 2: Sweat sodium concentration testing

The following criteria must be adhered to prior to a sweat sodium concentration test in order to determine accurate physiological values:

  • No exercise immediately before the sweat sodium test.

  • Come to your appointment wearing comfortable clothing (and a short sleeve shirt)

Time Commitment:

  • Your Sweat Sodium test will be scheduled for 45 minutes at eNRG Performance. You will sit down with an eNRG Performance Sport Dietitian to discuss your results and you will also be emailed a final copy of your test data and the interpretation.

Payment is due prior to or on the day of the test via check, cash or credit card.

Information About the Test

  • This is a non-exercise test.

  • The purpose of this test is to determine the concentration of sodium in your sweat, extrapolated per liter of sweat volume. This tells us how “salty” your sweat is.

  • To collect the sweat sample, we use your inner forearm to activate the sweat glands via a light electrical current and a non-toxic chemical gel. A medical grade analyzer will measure your sweat sodium concentration immediately, so you have results right away.

  • Because your sweat sodium concentration is largely genetically determined, this is a one-time test. You do not need to repeat this testing.


Test Preparation

  • Try to avoid exercise in the 2 hours prior to your scheduled appointment.

  • Arrive at your appointment adequately hydrated.

  • There is no need to fast for this appointment.

  • If you have a large amount of hair on your forearms, we may ask you to shave a portion of your inner forearm for the application of the equipment.

  • If you have current sweat rate data to indicate your typical fluid losses, please bring your information to the appointment. Click HERE to print the instructions for how to do your own sweat rate testing.

Sweat sodium concentration testing questionnaire

eNRG Performance Team Member *
Scheduled test date *
Scheduled test date
Name *
Telephone number *
Telephone number
Gender *
Date of birth *
Date of birth
How many hours per week do you currently train? *
How would you classify your sweat rate?
How much salt do you think you lose in your sweat? *
How often do you experience muscle cramps? *
How often do you see salty white residue on your skin and/or clothes after exercise? *