Is it Okay to Weigh Athletes for Hydration Purposes? Q&A With RD Rebecca McConville
Rebecca McConville MS RD LD CSSD CEDRD-C is a sports dietitian, eating disorder specialist, and author of Finding Your Sweet Spot- How to Avoid REDs. Becca has a passion to take complex concepts like REDS and make it relatable. She has a REDs informed provider certification program and co-leads with MBE an annual Eating Disorder in Sport workshop.
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RM: Hydration can be one of the most overlooked yet impactful components of athletic performance. Unfortunately, body weight is often used to determine hydration needs. However, we don’t need to step on a scale to determine if we are adequately hydrating. There are other methods to gauge fluid losses during activity without involving weight.
Measuring body weight has been a popular method to “guesstimate” one’s hydration status. By weighing an athlete before and after training and subtracting their fluid consumption (oz) during training, we can estimate what that athlete’s hydration needs would be per hour to maintain adequate hydration. The theory is that the weight change that occurred during training correlates with the amount of sweat loss that occurred. We can then determine a target amount of fluid consumption that would compensate for those losses. However, this is not a very accurate method to determine hydration needs. Many uncontrollable, unpredictable factors affect weight, making it a measurement that is actually quite volatile.