Interscholastic Female Wrestler’s Percent Body Fat And Minimum Wrestling Weight Values: Is The 12% Body Fat Minimum Too Low?

Introduction: This study aimed to provide a descriptive summary of body fat percentage (%BF), sum of skinfolds (SSF), and Minimum Wrestling Weight (MWW) values across all 14 weight classes among interscholastic female wrestlers in Illinois. A secondary aim was to evaluate the likelihood that 12%BF occurs among female wrestlers and assess whether the current minimum %BF threshold should be reconsidered by the sport governing body (SGB). Methods: A retrospective analysis was conducted on data from 2,291 female wrestlers during the 2023–2024 Illinois High School Association (IHSA) season. As part of mandated preseason weight certification, skinfold measurements were taken, and %BF was estimated using the Slaughter equation. Descriptive statistics and frequency analyses were used to establish normative values for %BF, SSF, and MWW. MWW and minimum weight class (MWC) were calculated using both the current minimum 12%BF standard and an alternative 19%BF threshold based on the 5th percentile of the sample. Results: The mean %BF was 29.7 ± 8.1%, with only 0.17% of athletes (n = 4) falling at or below 12%BF. On average, wrestlers were 27.2 ± 14.2 lbs. above their MWC at 12%BF and 17.7 ± 14.1 lbs. above at 19%BF. Reaching MWC would require 10.9 weeks under the 12%BF threshold versus 6.7 weeks at 19%, using the NFHS 1.5% weekly weight loss limit. The current weight distribution was negatively skewed, while the 12%BF threshold resulted in a highly positive skew. In contrast, the 19%BF threshold produced a more normalized distribution. A strong positive correlation between %BF and MWC was observed (r = 0.84, p < 0.001). Conclusion: Achieving 12%BF is improbable and rare among female high school wrestlers. Raising the minimum threshold to 19%BF may reduce harmful weight-cutting practices, improve athlete safety, and promote more equitable weight class distribution.