C B Dixon1, B Masteller, J L Andreacci. 1. Department of Health Science, Lock Haven University, Lock Haven, PA, USA. cdixon@lhup.edu
Abstract
BACKGROUND/ OBJECTIVES: To determine the effect of a meal on impedance and percent body fat (%BF) determined using contact-electrode bioelectrical impedance analysis (BIA) technology. SUBJECTS/ METHODS: Forty-three adults (23 women and 20 men) volunteered to participate in this study (age=20.5±1.1 years; body mass index=24.1±3.8 kg/m(2)). Body composition was assessed using three BIA analyzers: leg-to-leg (LBIA), segmental (SBIA) and multi-frequency (MFBIA), on two separate occasions. After a baseline measurement, subjects consumed a meal or received nothing, which served as the control (CON). Subjects were reassessed 20, 40 and 60 min following (POST) the baseline measure in each condition. RESULTS: Twenty minutes after eating (3847±900 kJ), body mass (LBIA=0.8 kg, SBIA=0.8 kg, MFBIA=0.7 kg, P<0.05), impedance (LBIA=6.0 Ω, SBIA=17.9 Ω, MFBIA=27.1 Ω, P<0.05) and %BF (LBIA=0.9%, SBIA=1.7%, MFBIA=0.8%, P<0.05) increased significantly and remained elevated at 60 min POST. During the CON trial, a consistent body mass reduction (60-80 g) and impedance increase (4-9 Ω) was observed over time resulting in a small increase in %BF (0.3-0.7%) 60 min POST (P<0.05). CONCLUSIONS: Twenty minutes after eating, %BF increased due to elevations in impedance and body mass. As such, when precision is critical, we recommend adhering to the pretest fasting guidelines to avoid meal-induced alterations in %BF estimates. In addition, use of a consistent testing schedule may minimize normal %BF variation over time.
BACKGROUND/ OBJECTIVES: To determine the effect of a meal on impedance and percent body fat (%BF) determined using contact-electrode bioelectrical impedance analysis (BIA) technology. SUBJECTS/ METHODS: Forty-three adults (23 women and 20 men) volunteered to participate in this study (age=20.5±1.1 years; body mass index=24.1±3.8 kg/m(2)). Body composition was assessed using three BIA analyzers: leg-to-leg (LBIA), segmental (SBIA) and multi-frequency (MFBIA), on two separate occasions. After a baseline measurement, subjects consumed a meal or received nothing, which served as the control (CON). Subjects were reassessed 20, 40 and 60 min following (POST) the baseline measure in each condition. RESULTS: Twenty minutes after eating (3847±900 kJ), body mass (LBIA=0.8 kg, SBIA=0.8 kg, MFBIA=0.7 kg, P<0.05), impedance (LBIA=6.0 Ω, SBIA=17.9 Ω, MFBIA=27.1 Ω, P<0.05) and %BF (LBIA=0.9%, SBIA=1.7%, MFBIA=0.8%, P<0.05) increased significantly and remained elevated at 60 min POST. During the CON trial, a consistent body mass reduction (60-80 g) and impedance increase (4-9 Ω) was observed over time resulting in a small increase in %BF (0.3-0.7%) 60 min POST (P<0.05). CONCLUSIONS: Twenty minutes after eating, %BF increased due to elevations in impedance and body mass. As such, when precision is critical, we recommend adhering to the pretest fasting guidelines to avoid meal-induced alterations in %BF estimates. In addition, use of a consistent testing schedule may minimize normal %BF variation over time.
Authors: Arshdeep K Randhawa; Veronica Jamnik; Michael D T Fung; Adam S Fogel; Jennifer L Kuk Journal: BMC Public Health Date: 2021-03-12 Impact factor: 3.295