NCSF Sport Nutrition Specialist Certification (SNS) Practice Test

Performance is generally recognized to be negatively affected when water loss reaches approximately 2% of total body weight. At this level, athletes may start to experience reduced endurance, increased perceived exertion, and impairments in cognitive function. It's important to note that different individuals may have varying tolerances to dehydration, but the 2% threshold is a widely accepted standard. While a loss of 1% of total body weight might not significantly impact performance, reaching a loss of 3% can lead to further detrimental effects, including decreased strength and higher chances of heat-related illnesses. Losses at 5% or more can severely compromise physical activity, leading to risks of heat exhaustion, cramps, and even heat stroke in extreme conditions. The chosen answer reflects a common point of concern in sports nutrition regarding hydration and performance levels.