The current study aimed: i) to external-validate total body water (TBW) and extracellular water (ECW) derived from athlete and non-athlete predictive equations using radioisotope-dilution techniques as a reference criterion in male and female athletes; ii) in a larger sample, to determine the agreement between specific and generalized equations when estimating body fluids in male and female athletes practicing different sports. A total of 1371 athletes (men: n=921, age 23.9±1.4 y; women: n=450, age 27.3±6.8 y) participated in this study. All athletes underwent bioelectrical impedance analyses, while TBW and ECW were assessed with dilution techniques in a subgroup of 185 participants (men: n=132, age 21.7±5.1 y; women: n=53, age 20.3±4.5 y). Two specific and eight generalized predictive equations were tested. Compared to the criterion methods, no mean bias was observed using the athlete-specific equations for TBW and ECW (-0.32 to 0.05, p>0.05) and the coefficient of determination ranged from R2 = 0.83 to 0.94. The majority of the generalized predictive equations underestimated TBW and ECW (p<0.05); R2 ranged from 0.66 to 0.89. In the larger sample, all the generalized equations showed lower TBW and ECW values (ranging from -6.58 to -0.19, p<0.05) than specific predictive equations; except for TBW in female power/velocity (one equation) athletes and team sport (two equations). The use of generalized BIA-based equations leads to an underestimation of TBW, and ECW compared to athlete-specific predictive equations. Additionally, the larger sample indicates that generalized equations overall provided lower TBW and ECW compared to the athlete-specific equations.

Generalized bioelectric impedance-based equations underestimate body fluids in athletes / G. Coratella, F. Campa, C.N. Matias, S. Toselli, J.C. Koury, A. Andreoli, L.B. Sardinha, A.M. Silva. - In: SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS. - ISSN 0905-7188. - (2021 Aug 12). [Epub ahead of print] [10.1111/sms.14033]

Generalized bioelectric impedance-based equations underestimate body fluids in athletes

G. Coratella
Co-primo
;
2021-08-12

Abstract

The current study aimed: i) to external-validate total body water (TBW) and extracellular water (ECW) derived from athlete and non-athlete predictive equations using radioisotope-dilution techniques as a reference criterion in male and female athletes; ii) in a larger sample, to determine the agreement between specific and generalized equations when estimating body fluids in male and female athletes practicing different sports. A total of 1371 athletes (men: n=921, age 23.9±1.4 y; women: n=450, age 27.3±6.8 y) participated in this study. All athletes underwent bioelectrical impedance analyses, while TBW and ECW were assessed with dilution techniques in a subgroup of 185 participants (men: n=132, age 21.7±5.1 y; women: n=53, age 20.3±4.5 y). Two specific and eight generalized predictive equations were tested. Compared to the criterion methods, no mean bias was observed using the athlete-specific equations for TBW and ECW (-0.32 to 0.05, p>0.05) and the coefficient of determination ranged from R2 = 0.83 to 0.94. The majority of the generalized predictive equations underestimated TBW and ECW (p<0.05); R2 ranged from 0.66 to 0.89. In the larger sample, all the generalized equations showed lower TBW and ECW values (ranging from -6.58 to -0.19, p<0.05) than specific predictive equations; except for TBW in female power/velocity (one equation) athletes and team sport (two equations). The use of generalized BIA-based equations leads to an underestimation of TBW, and ECW compared to athlete-specific predictive equations. Additionally, the larger sample indicates that generalized equations overall provided lower TBW and ECW compared to the athlete-specific equations.
BIA; body composition; extracellular water; predictive equations; resistance training; total body water
Settore M-EDF/02 - Metodi e Didattiche delle Attivita' Sportive
12-ago-2021
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/861667
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