Aleš Gába1, Jana Pelclová2, Nikola Štefelová3, Miroslava Přidalová4, Izabela Zając-Gawlak5, Lenka Tlučáková6, Jana Pechová7, Zuzana Svozilová8. 1. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: ales.gaba@upol.cz. 2. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: jana.pelclova@upol.cz. 3. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: nikola.stefelova@seznam.cz. 4. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: miroslava.pridalova@upol.cz. 5. The Jerzy Kukuczka Academy of Physical Education, Mikołowska 72A, 40-065, Katowice, Poland. Electronic address: i.zajac-gawlak@awf.katowice.pl. 6. University of Presov, 17. Novembra 3724/15, 080 01, Prešov, Slovak Republic. Electronic address: lenka.tlucakova@unipo.sk. 7. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: jana.pechova@upol.cz. 8. Palacký University Olomouc, Třída Míru 117, Olomouc, 771 00, Czech Republic. Electronic address: zuzana.svozilova@upol.cz.
Abstract
BACKGROUND & AIMS: The aims of this study were to examine the prospective compositional associations between sedentary behaviour (SB) patterns and longitudinal changes in body composition parameters, and to use compositional isotemporal substitution modelling to analyse the longitudinal changes in body composition parameters associated with time reallocation from SB to physical activity (PA) in older women. METHODS: The study included women aged 60 years and older (n = 182) with valid data at baseline and at the subsequent 7-year follow-up. For both time points, the ActiGraph GT1M accelerometer was used for SB and PA assessments and multi-frequency bioimpedance analysis was used to assess the body composition parameters related to adiposity and muscle mass. Compositional regression models were used to analyse the associations between proportion of time spent in sedentary bouts of different duration and longitudinal changes in body composition parameters. A compositional isotemporal substitution model was created to estimate the differences in body composition parameters associated with one-to-one time reallocations between baseline SB and PA. RESULTS: A significant increase in fat mass index (βilr1 = 0.61, 95% confidence interval [CI]: 0.18, 1.04) and visceral adipose tissue (βilr1 = 6.01, 95% CI: 1.52, 10.5) was associated with a higher baseline proportion of time spent in long sedentary bouts (i.e. sedentary bout of ≥30 min). Reallocating 1 h/week and 3.5 h/week from the time spent in long sedentary bouts in favour of light PA was associated with a significant decrease in fat mass index by 0.78% (95% CI: 0.24, 1.32) and 3.13% (95% CI: 0.97, 5.29), respectively. No association was found for indicators of muscle mass. CONCLUSIONS: This study suggests that long-term adiposity status could be improved by increasing the proportion of time spent in light PA at the expense of time spent in prolonged SB. This finding may help in designing more effective and feasible interventions for the maintenance of healthy body composition in advanced age.
BACKGROUND & AIMS: The aims of this study were to examine the prospective compositional associations between sedentary behaviour (SB) patterns and longitudinal changes in body composition parameters, and to use compositional isotemporal substitution modelling to analyse the longitudinal changes in body composition parameters associated with time reallocation from SB to physical activity (PA) in older women. METHODS: The study included women aged 60 years and older (n = 182) with valid data at baseline and at the subsequent 7-year follow-up. For both time points, the ActiGraph GT1M accelerometer was used for SB and PA assessments and multi-frequency bioimpedance analysis was used to assess the body composition parameters related to adiposity and muscle mass. Compositional regression models were used to analyse the associations between proportion of time spent in sedentary bouts of different duration and longitudinal changes in body composition parameters. A compositional isotemporal substitution model was created to estimate the differences in body composition parameters associated with one-to-one time reallocations between baseline SB and PA. RESULTS: A significant increase in fat mass index (βilr1 = 0.61, 95% confidence interval [CI]: 0.18, 1.04) and visceral adipose tissue (βilr1 = 6.01, 95% CI: 1.52, 10.5) was associated with a higher baseline proportion of time spent in long sedentary bouts (i.e. sedentary bout of ≥30 min). Reallocating 1 h/week and 3.5 h/week from the time spent in long sedentary bouts in favour of light PA was associated with a significant decrease in fat mass index by 0.78% (95% CI: 0.24, 1.32) and 3.13% (95% CI: 0.97, 5.29), respectively. No association was found for indicators of muscle mass. CONCLUSIONS: This study suggests that long-term adiposity status could be improved by increasing the proportion of time spent in light PA at the expense of time spent in prolonged SB. This finding may help in designing more effective and feasible interventions for the maintenance of healthy body composition in advanced age.