Wrestlers' minimal weight: anthropometry, bioimpedance, and hydrostatic weighing compared

Area of Science:

• Sports Medicine
• Human Physiology
• Anthropometry

Background:

• Accurate minimal weight (MW) assessment is vital for interscholastic wrestlers' health and performance.
• While anthropometric methods are validated, research on bioelectrical impedance (BIA) accuracy and comparisons between BIA systems is limited.

Purpose of the Study:

• To compare the validity of anthropometric methods and BIA systems for predicting MW in interscholastic wrestlers.
• To evaluate differences between various BIA devices (Berkeley Medical Research (BMR), RJL, Valhalla (VAL)) and anthropometric techniques.

Main Methods:

• Compared three anthropometric methods (skinfolds (SF), two skeletal dimensions equations) and three BIA systems (BMR, RJL, VAL) against hydrostatic weighting (HW) in 57 wrestlers.
• Analyzed correlations, standard errors of estimate (SEE), total errors of prediction (E), and mean differences between methods.

Main Results:

• All methods showed high correlations with HW (r > 0.92).
• SF and BMR BIA demonstrated nonsignificant differences with HW and smaller prediction errors (E = 1.8 and 2.3 kg) compared to RJL and VAL (E = 4.4 and 3.9 kg).
• BMR BIA showed significant differences from RJL and VAL systems.

Conclusions:

• Skinfolds (SF) and Berkeley Medical Research (BMR) BIA are the most valid methods for determining minimal weight in interscholastic wrestlers.
• RJL and VAL BIA systems may have potential but require further refinement, possibly by incorporating anthropometric data.
• Future research should focus on enhancing prediction equation utility for diverse athletic populations.