Banca de DEFESA: CARLA BIANCA TABOSA OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLA BIANCA TABOSA OLIVEIRA
DATE: 20/07/2026
TIME: 14:00
LOCAL: REMOTA
TITLE:

LONGITUDINAL CHANGES AND CORRELATES OF 24- HOUR MOVEMENT BEHAVIORS AND STEPS IN BRAZILIAN OLDER ADULTS: A 4 YEAR FOLLOW-UP

KEY WORDS:

Accelerometer, physical activity, aging, sedentary behaviour.

PAGES: 87
BIG AREA: Ciências da Saúde
AREA: Educação Física
SUMMARY:

The objective of this dissertation was to investigate the longitudinal changes in 24-hour movement behaviors and step patterns, as well as their potential correlates, in community-dwelling older adults. A longitudinal study was conducted with individuals aged between 60 and 80 years, assessed at two time points with a mean follow-up interval of 4 years. The 24-hour movement behaviors and step-related variables were measured using accelerometry (ActiGraph GT3X+) over one week at baseline and follow-up. Nocturnal sleep time (NST), sedentary behavior (SB), light physical activity (LPA), moderate-to-vigorous physical activity (MVPA), step volume (total, incidental, and purposeful steps), and step intensity, through peak 1-, 30-, and 60-minute cadences, were assessed. Changes over time were calculated using absolute difference, annual change, and annual percentage change. The Generalized Estimating Equations (GEE) model was used to investigate longitudinal changes and their associations with potential baseline correlates (age, sex, body mass index (BMI), post-secondary education, and multimorbidity). A significance level of 5% (p < 0.05) was adopted for all analyses. Eighty-six older adults were included in the analyses (67.4 ± 5.3 years; mean follow-up of 4.0 ± 0.4 years). No significant changes in nocturnal sleep time were observed after the follow-up period (p > 0.05). However, there was an increase in sedentary behavior (36 ± 86 min/day), a reduction in light physical activity (−16 ± 63 min/day) and moderate-to-vigorous physical activity (−9 ± 20 min/day), as well as a reduction in step volume (total steps: −1,139 steps/day; incidental steps: −122 steps/day; purposeful steps: −1,017 steps/day) and step intensity (−8 steps/min) over the four-year period (p < 0.05). Older baseline age was associated with a reduction in nighttime sleep duration, an increase in sedentary behavior, and a reduction in the number of total and incidental steps over time (p < 0.05). Female sex was associated with a reduction in nighttime sleep duration, an increase in sedentary behavior and MVPA, as well as a higher number of purposeful steps and higher peak 30- and 60-minute cadences. Higher baseline BMI was associated with a reduction in purposeful steps and peak 30- and 60-minute cadences, whereas post-secondary education was associated with a higher number of total steps and higher peak 30- and 60-minute cadences. No associations were observed between multimorbidity and changes in movement behaviors or step patterns (p > 0.05). In conclusion, community-dwelling older adults exhibited a longitudinal pattern characterized by an increase in sedentary behavior, a reduction in physical activity, and a decrease in step volume and intensity over four years, whereas nighttime sleep duration remained stable. Identifying the factors associated with these changes may help guide strategies aimed at reducing sedentary behavior, promoting physical activity, and preserving mobility, thereby contributing to healthier aging.

COMMITTEE MEMBERS:
Externa à Instituição - ALINE MENDES GERAGE DA SILVA - UFSC
Presidente - 2682821 - EDUARDO CALDAS COSTA
Externo à Instituição - RAFAEL MIRANDA TASSITANO