The associations of body mass index, bioimpedance spectroscopy-based calf intracellular resistance, single-frequency bioimpedance analysis and physical performance of older people

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Björkman , M P , Jyväkorpi , S K , Strandberg , T , Pitkälä , K H & Tilvis , R S 2020 , ' The associations of body mass index, bioimpedance spectroscopy-based calf intracellular resistance, single-frequency bioimpedance analysis and physical performance of older people ' , Aging Clinical and Experimental Research , vol. 32 , no. 6 , pp. 1077-1083 . https://doi.org/10.1007/s40520-019-01301-8

Title: The associations of body mass index, bioimpedance spectroscopy-based calf intracellular resistance, single-frequency bioimpedance analysis and physical performance of older people
Author: Björkman, Mikko P.; Jyväkorpi, Satu K.; Strandberg, Timo; Pitkälä, Kaisu H.; Tilvis, Reijo S.
Contributor: University of Helsinki, HUS Internal Medicine and Rehabilitation
University of Helsinki, Department of General Practice and Primary Health Care
University of Helsinki, HUS Internal Medicine and Rehabilitation
University of Helsinki, Department of General Practice and Primary Health Care
University of Helsinki, HUS Internal Medicine and Rehabilitation
Date: 2020-06
Language: eng
Number of pages: 7
Belongs to series: Aging Clinical and Experimental Research
ISSN: 1720-8319
URI: http://hdl.handle.net/10138/316169
Abstract: BACKGROUND: Bioimpedance skeletal muscle indices (SMI) are used as a surrogate for skeletal muscle mass, but their associations with physical functioning and obesity need further evaluation. AIMS: To compare the associations of body mass index (BMI), bioimpedance spectroscopy-based calf intracellular resistance (Cri-SMI), and single-frequency bioimpedance analysis (SF-SMI) indices with physical performance and the functioning of community-dwelling older people at risk of or already suffering from sarcopenia. METHODS: Pre-intervention measurements of the screened subjects and the participants of the Porvoo sarcopenia trial (N = 428) were taken. Cri-SMI, whole-body SF-SMI, and BMI were related to hand-grip strength, walking speed, short physical performance battery (SPPB), and the physical component of the RAND-36. RESULTS: Among the older people (aged 75-96), Cri-SMI correlated inversely with age (men r = - 0.113, p < 0.001; women r = - 0.287, p < 0.001), but positively with SPPB (r = 0.241, p < 0.001) and the physical component of the RAND-36 (r = 0.114, p = 0.024), whereas BMI was inversely associated with SPPB (r = - 0.133, p < 0.001) and RAND-36 (r = - 0.286, p < 0.001). After controlling for age, gender, and comorbidity, one unit of Cri-SMI (cm2/Ω) was associated with a 3.3-fold probability of good physical performance (SPPB ≥ 9 points, OR = 3.28, p < 0.001) and one unit of BMI (kg/m2) decreased the respective probability 4% (OR= 0.96, p = 0.065). Physical inactivity partly explained the negative association of BMI. When Cri-SMI and BMI were controlled for, a 1% difference in Cri-SMI was associated with a 0.7% (p < 0.001) higher probability of good performance, the respective figure being - 2.2% (p = 0.004) for BMI. The associations of SF-SMI with physical functioning indices were insignificant. CONCLUSIONS: Independent of each other, Cri-SMI was positively and BMI was inversely associated with the physical performance and functioning of community-dwelling older people who were at risk of or already suffering from sarcopenia. We found no association between SF-SMI and physical functioning.
Subject: 3121 Internal medicine
Bioelectrical impedance
Intracellular resistance
Muscle strength
Physical performance
Sarcopenia
Bioelectrical impedance
Intracellular resistance
Muscle strength
Physical performance
Sarcopenia
SKELETAL-MUSCLE
SARCOPENIA
STRENGTH
WATER
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