New Mathematical Equation for the Phase Angle Between Sedentary and Physically Active Adults
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| Auteurs: | , , , , , |
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| Formaat: | artículo original |
| Status: | Versión publicada |
| Publicatiedatum: | 2026 |
| Omschrijving: | Introduction: The phase angle is a tool that measures cellular integrity, body composition quality, and is associated with mortality and quality of life. This measurement enhances body composition analysis by using fewer variables (resistance and reactance) and having lower measurement errors. Bioelectrical impedance is used to estimate the phase angle, but not all devices provide this value directly, requiring a mathematical calculation. Objective: To propose a mathematical equation for calculating the phase angle from impedance and reactance in sedentary and physically active adults using devices that do not provide the phase angle. Method: A cross-sectional, quantitative, and descriptive study with 63 participants (26 sedentary and 37 physically active, gender male and female). The equation developed was: Capacitor=SQRT((1/(4π()^2Frequency20^2)-1/(4π()^2Frequency100^2))/(Frequency20^2-Frequency100^2)); PA=atan(capacitance2/resistance)(180/π()); Capacitance2=1/(2π()frequencycapacitor). Statistical analyses compared phase angles between Biodynamics and Inbody devices, showing no significant differences. Results: The mean phase angle for physically active female was 6.6±0.9° (Inbody) and 6.9±0.8° (Biodynamics) (p=0.57); for male, 7.1±0.5° (Inbody) and 7.6±0.6° (Biodynamics) (p=0.71). Conclusion: The phase angle can be calculated using a mathematical equation with consistent results. |
| Land: | Portal de Revistas UNA |
| Instelling: | Universidad Nacional de Costa Rica |
| Repositorio: | Portal de Revistas UNA |
| Taal: | Portugués Español Inglés |
| OAI Identifier: | oai:www.revistas.una.ac.cr:article/22160 |
| Online toegang: | https://www.revistas.una.ac.cr/index.php/mhsalud/article/view/22160 |
| Keyword: | physically active phase angle bioimpedance equation activo físicamente ángulo de fase bioimpedancia ecuación angulo de fase bioimpedância equação praticantes de atividade física |