Banca de DEFESA: YURI ALBERTO FREIRE DE ASSIS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : YURI ALBERTO FREIRE DE ASSIS
DATE: 28/11/2025
TIME: 14:00
LOCAL: REMOTA
TITLE:

INTERDEPENDENCE BETWEEN SEDENTARY TIME, PHYSICAL ACTIVITY, CARDIOMETABOLIC HEALTH, AND FUNCTIONAL FITNESS IN OLDER ADULTS: EVIDENCE FROM A CROSS-SECTIONAL STUDY.

KEY WORDS:

Aging; Sedentary Behavior; Cardiovascular Health; Physical Fitness.

PAGES: 208
BIG AREA: Ciências da Saúde
AREA: Educação Física
SUMMARY:

This thesis aimed to analyze the interdependent associations between sedentary time (ST), physical activity (PA), and parameters of cardiometabolic and functional health in community-dwelling older adults. Five cross-sectional studies were conducted with a sample of 248 older adults aged 60 to 80 years. Study 1 examined the association between different patterns of ST accumulation and cardiometabolic risk. Studies 2, 3, and 4 investigated whether the association between ST and cardiometabolic risk is moderated by PA level and ST interruptions (Study 2), step volume and cadence (Study 3), and performance on the 6-minute walk test (6MWT; Study 4). Study 5 investigated the association between movement behavior patterns and cardiometabolic health, body composition, and functional fitness. ST, PA, daily steps, and step cadence were measured by accelerometry. Step cadence was calculated as the average of the 30 highest cadence minutes of the day. Cardiometabolic risk was defined by a continuous score based on the components of metabolic syndrome (cMetS). Body composition was estimated by the appendicular lean mass/body mass index ratio (ALM/BMI), while functional fitness was assessed by a composite z-score from the Senior Fitness Test battery. Movement behavior patterns were derived by principal component analysis. The results showed that total ST (β = 0.08) and ST in bouts > 30 min (β = 0.16) were positively associated (p < 0.05) with cMetS, while ST in bouts < 10 min was inversely associated (β = -0.18). PA levels, daily steps, step cadence, and 6MWT performance moderated the relationship between ST and cMetS. This relationship became non-significant (p ≥ 0.05) at the following thresholds: moderate-to-vigorous PA ≥ 19 min/day; light PA ≥ 5.9 h/day; short (≤ 5 min) ST interruptions ≥ 87/day; long (> 5 min) ST interruptions ≥ 10/day; daily steps ≥ 5,715; step cadence ≥ 57 steps/min; and 6MWT performance ≥ 480 meters. Two behavioral patterns were identified: 'Turtle' (high light PA and steps/day, and low ST) and 'Hare' (high level of moderate-to-vigorous PA, steps/day, and step cadence). The 'Turtle' (β = -0.10) and 'Hare' (β = -0.15) patterns were associated with lower cMetS, but only the 'Hare' pattern was positively associated with ALM/BMI (β = 0.02) and functional fitness (β = 0.60). In conclusion, older adults with higher total or prolonged ST have a higher cardiometabolic risk; however, this risk can be eliminated starting from specific thresholds of PA levels, based on time or step count, and 6MWT performance. Furthermore, older adults with either the 'Turtle' or 'Hare' movement behavior pattern have a lower cardiometabolic risk, but only those with the 'Hare' pattern have better body composition and functional fitness. This thesis deepens the understanding of the interdependent relationships between ST, PA, and indicators of healthy aging.

COMMITTEE MEMBERS:
Presidente - 2682821 - EDUARDO CALDAS COSTA
Externo à Instituição - JEFFER EIDI SASAKI - UFTM
Externo à Instituição - RAFAEL MIRANDA TASSITANO
Externo ao Programa - 3138718 - RICARDO SANTOS OLIVEIRA - nullExterno à Instituição - VALTER CORDEIRO BARBOSA FILHO - UECE