Isotemporal substitution analysis of time between sleep, sedentary behavior, and physical activity on depressive symptoms in older adults: a cross-sectional study

ABSTRACT BACKGROUND: Compared to young individuals, older adults participate more in sedentary behavior (SB) and less in physical activity (PA). These behaviors are associated with numerous adverse health factors. OBJECTIVE: The purpose of the study was to examine the hypothetical effects of substituting time spent sleeping, performing SB, and performing moderate-to-vigorous physical activity (MVPA) on depressive symptomatology in older adults. DESIGN AND SETTING: An analytical cross-sectional study employing exploratory survey methods was conducted in the city of Alcobaça in the state of Bahia, Brazil METHODS: The study included 473 older adults who answered a structured questionnaire during an interview. Exposure time to SB and PA level were assessed using the International Physical Activity Questionnaire, and depressive symptoms were analyzed using the short version of the Geriatric Depression Scale. An isotemporal replacement model was used to evaluate the effects of different SB sessions on depressive symptomatology. RESULTS: An increase in the risk of depressive symptoms was observed when MVPA and sleep time were substituted for the same SB time at all times tested, with maximum values of 40% and 20%, respectively. Opposite substitution of MVPA and sleep time increments reduced the risk of depressive symptomatology by 28% and 17%, respectively. CONCLUSIONS: The results of the present study indicate that replacing SB with the same amount of sleep or MVPA may reduce depressive symptoms. The longer the reallocation time, the greater are the benefits.

Habitual physical activity and sedentary behavior as predictors of dynapenia in older adults: a cross-sectional study

ABSTRACT BACKGROUND: Dynapenia is a risk factor of mortality. Therefore, the development of low-cost and easy-to-apply tools is essential to optimize the health surveillance actions of older people. OBJECTIVES: To compare the time spent on habitual physical activity (HPA) and sedentary behavior (SB) among dynapenic and non-dynapenic older adults and ascertain the predictive ability of these behaviors on outcome. DESIGN AND SETTING: A cross-sectional population epidemiological survey was conducted involving 208 older adults. METHODS: HPA and SB were quantified using the International Physical Activity Questionnaire, and dynapenia was identified by handgrip strength (women: 18.37 kgf; men: 26.75 kgf). RESULTS: The prevalence was 24.50%. In both sexes, dynapenic individuals reported a HPA median time of 70.00 minutes/week (min/wk), while non-dynapenic women and men reported HPA median times of 240.00 and 280.00 min/wk, respectively (P < 0.05). For SB among dynapenic individuals, a median of 388.75 min/day was observed in women and 428.57 min/d in men. In contrast, non-dynapenic women and men had 291.42 and 274.28 min/day in SB (P < 0.05), respectively. The best cutoff HPA to discriminate the outcome was 150.00 min/wk in women (sensitivity: 73.30%; specificity: 60.67%) and 140.00 min/wk in men (sensitivity, 71.43%; specificity, 61.54%). The best cutoff SB was 381.43 min/day in women (sensitivity, 53.30%; specificity, 84.80%) and 351.43 min/day in men (sensitivity, 71.43%; specificity, 73.85%). CONCLUSION: Older individuals with dynapenia spent less time on HPA and more time in SB. Furthermore, HPA was found to be a better discriminator of dynapenic individuals, and SB better discriminated non-dynapenic individuals.

Isotemporal substitution of sleep or sedentary behavior with physical activity in the context of frailty among older adults: a cross-sectional study

ABSTRACT BACKGROUND: Frailty syndrome is associated with various physical, cognitive, social, economic, and environmental factors. Although frailty syndrome occurs progressively with age, prevention and treatment are possible. Reducing or eliminating risks and increasing protective factors may be potential strategies for reducing the prevalence of injuries related to frailty. One of the most effective actions is to decrease the time spent in sedentary behavior (SB) by increasing regular physical activity (PA). OBJECTIVE: To examine the hypothetical effect of substitution of the time spent in sleep or SB with an equivalent time spent performing moderate or vigorous PA on frailty syndrome in the older population. DESIGN AND SETTING: An analytical cross-sectional study conducted using exploratory methods of survey, carried out in Alcobaça city, Bahia, Brazil. METHODS: A total of 456 older adults of both sexes, aged ≥ 60 years, participated in this study. Frailty syndrome was identified according to the criteria of the Study of Osteoporotic Fractures. PA and SB were assessed using the International Physical Activity Questionnaire, and sleep was assessed using the Pittsburgh Sleep Quality Index. The effects of time substitution on these behaviors were verified using Poisson regression. RESULTS: The replacement of 60 min/day of SB (prevalence ratio, PR = 0.52; 95% confidence interval, CI: 0.28-0.96) or sleep (PR = 0.52; 95% CI: 0.27-0.98) with 60 min/day of moderate PA (MPA) was associated with a 48% reduction in the prevalence of frailty syndrome. CONCLUSIONS: Replacing the time spent sitting or sleeping with the same amount of MPA time may reduce frailty; the longer the duration of time spent in the substitution of sleep or SB with MPA, the greater the benefits.

Reallocation of time spent on sedentary behavior by time spent on physical activity reduces dynapenia in older adults: a prospective cohort study

ABSTRACT BACKGROUND: Dynapenia is characterized by mobility limitations in the older population when combined with aggravating behavioral factors that can increase the risk of morbidity and mortality. OBJECTIVE: To investigate the hypothetical effects of reallocation of time spent on sedentary behavior (SB), moderate-to-vigorous physical activity (MVPA), and sleep on dynapenia in older adults. DESIGN AND SETTING: A prospective cohort study using exploratory surveys in Alcobaça City, Bahia State, Brazil. METHODS: In total, 176 older adults (≥ 60 years) of both sexes participated in this study. Dynapenia was assessed using the handgrip strength test with cutoff points of < 27 kg for men and < 16 kg for women. MVPA and SB were assessed using the International Physical Activity Questionnaire, and sleep was assessed using the Pittsburgh Sleep Quality Index. RESULTS: Effects on reallocation were found for the shortest times, such as 10 minutes (odds ratio (OR) 0.92; 95% confidence interval (CI): 0.85-0.99); substituting MVPA with SB increased the chances of dynapenia by 58.0% (95% CI: 1.01-2.49). Analyzing the substitution of 60 minutes/day of SB with 60 minutes/day of MVPA revealed a protective effect, with a lower OR for dynapenia of 37.0% (OR 0.63; 95% CI: 0.40-0.99). The reallocation of sleep time did not significantly reduce dynapenia. CONCLUSIONS: Substituting the time spent sitting with the same amount of time spent on MVPA can reduce dynapenia, and a longer reallocation time confers greater health benefits in older adults.

Health promotion for workers focusing on physical activity and sedentary behavior: Epidemiological studies in occupational health at the Physical Fitness Research Institute / 体力科学

Health issues with workers include many aspects that scientific research in physical fitness and sports medicine can contribute to. Nevertheless, in Japan, there are few studies on the health problems in workers reported in the field of physical fitness and sports medicine. One reason could be the difficulty of obtaining cooperation in research from companies. This paper introduces results of epidemiological studies on health problems in workers by the Physical Fitness Research Institute. Our research serves as an example of physical fitness and sports medicine studies, including methods for securing fields for research. For the last decade, various epidemiological studies on worker’s mental health, sleep, non-alcoholic fatty liver disease, and labor related issues have been conducted in our research institute. Most of these studies indicated that lack of physical activity is associated with these indicators in Japanese workers. In recent years, we have also been conducting observational and interventional studies focusing on sedentary behavior in workers. Physical activity is deeply linked to worker’s health, therefore, the important approach to start a research in occupational health is to plan research that solves the company’s health challenges. In occupational health, the needs to promote physical activity and to reduce sitting time are growing under the movement of “Health and Productivity Management” and burden of the COVID-19 pandemic. We believe that current challenges provide an opportunity to advance physical fitness and sports medicine research in occupational health.

Prevalence of Metabolic Syndrome (MetS) and Determinants Among Obese Teachers in Makassar, Indonesia

@#Metabolic Syndrome (MetS) is related to the increased risk of non-communicable diseases (NCDs). Teacher profession is an adult group with various risks of NCDs. This study aims to assess the determinants of the MetS in teachers with central obesity. Material and Methods: The study was conducted in Makassar, South Sulawesi, Indonesia with cross- sectional study design on 12 secondary schools. The number of samples in this study was 129 teachers. The prevalence of the MetS was determined using criteria from the Joint Interim Statement, while physical activity and sitting time were measured using the International Physical Activity Questionnaire (IPAQ). Results: Respondents in our study were mostly women (78.3%) with an average age of 49.8 years. The prevalence of the MetS in our study population was 39.5%. The prevalence of the Mets was higher in Buginese ethnic (70.6%), respondents with more income (56.9%), bachelor degree (80.4%), married (98%), family history of diabetes mellitus, obesity, hypertension and heart diseases (52.9%), and moderate physical activity (37.3%). There was a significant relationship between sitting time 4 hours; p=0.004), parameters of Mets (p<0.001), LDL (p=0.026), and LDL/HDL ratio (p<0.001) with the Mets. Conclusions: The prevalence of the Mets is high among obese teachers in our study population. Sitting time was an important determinant for MetS among obese teachers.

Does the type of sedentary behaviors influence blood pressurein adolescents boys and girls? A cross-sectional study / Será que o tipo de comportamento sedentário influencia a pressão arterial em meninos e meninas adolescentes? Um estudo transversal

Abstract The aim of this study was to analyze the association between different sedentary behaviors and high blood pressure in adolescent boys and girls. We conducted a cross-sectional study with 6,264 Brazilian adolescents (14 to 19 years old). Demographic data, obesity indicators and blood pressure, were evaluated. Time spent in the sedentary behaviors (television viewing, playing video games, using the computer, non-screen sitting and, total time sitting) were also assessed. The girls spent more time watching television than boys, whereas boys spent more time using computers and video games (12.7% vs. 7.4%, p < 0.001) than girls. Boys who watched more than four hours of television presented higher odds to give high blood pressure after adjustments for physical activity level, body mass index, age and educational level of mother (OR = 2.27, p < 0.001). In girls, we did not find a relation between sedentary behaviors and high blood pressure (p > 0.05). Television viewing time is associated with high blood pressure only boys. So, reduce this sedentary behavior, stimulating physical activities, might be essential to health, principally for male adolescents.

Resumo O objetivo desta pesquisa foi analisar a associação entre diferentes comportamentos sedentários e pressão arterial elevada em meninos e meninas adolescentes, em estudo transversal com 6.264 adolescentes brasileiros (14 a 19 anos de idade). Foram avaliados dados demográficos, indicadores de obesidade e pressão arterial, assim como o tempo gasto em comportamentos sedentários (assistir televisão, jogar videogame, usar o computador, e o tempo total sentado). As meninas passaram mais tempo vendo televisão do que os meninos, enquanto estes usaram mais computadores e jogos de vídeogame (12,7% vs. 7,4%, p < 0,001) do que elas. Meninos que assistiram mais de quatro horas de televisão apresentaram maior probabilidade de ter pressão arterial elevada após os ajustes pelo nível de atividade física, índice de massa corporal, idade e nível de instrução da mãe (OR = 2,27, p < 0,001). Com as meninas não foi observada uma relação entre comportamentos sedentários e pressão arterial elevada (p > 0,05). O tempo assistindo televisão esteve associado com a pressão arterial elevada apenas entre os meninos. Assim, reduzir o comportamento sedentário, estimulando atividades físicas, pode ser essencial para a saúde, principalmente para adolescentes do sexo masculino.

Média diária de tempo sentado e fatores associados em adultos residentes no município de Ribeirão Preto-SP, 2006: projeto OBEDIARP / Sitting-time means and correlates in adults living in Ribeirão Preto-SP, Brazil, in 2006: OBEDIARP project

Estimaram-se médias do tempo sentado e fatores associados, em adultos residentes em Ribeirão Preto-SP, em 2006. O estudo, de base populacional, teve delineamento transversal com amostra selecionada por conglomerados em três estágios. Em amostra de 1.205 elegíveis, 930 participaram do estudo. A variabilidade introduzida na terceira fração de amostragem foi corrigida pela atribuição de pesos amostrais que levaram em consideração a taxa de não-resposta e o número de elegíveis em cada domicílio, originando uma amostra ponderada de 2.197 participantes. Para o estudo de associação foram construídos modelos de regressão linear múltipla. Todas as estimativas foram calculadas levando-se em consideração o efeito de desenho amostral. O tempo sentado médio diário foi de 280,9 minutos. Na análise multivariada permaneceram associadas ao tempo sentado as seguintes variáveis: sexo; anos de escolaridade; hábito de fumar; gasto metabólico (Mets*min*semana-1); nº de horas de trabalho/dia e número de antecedentes de obesidade. Os resultados permitiram identificar os principais fatores associados ao tempo sentado, oferecendo subsídios para a construção de políticas públicas de promoção e prevenção em saúde.

This study aimed to estimate mean daily sitting-time and to identify correlates of sitting-time in adults living in the urban area of Ribeirão Preto-SP, in 2006. A cross-sectional population-based epidemiological study was carried out using three-stage cluster sampling. From a sample of 1,205 individuals, 930 attended the interviews. The variability introduced in the third sampling fraction was corrected by attributing sampling weights taking into account the non-response rate and the number of eligible units in each household, resulting in a weighted sample of 2,197 participants. To identify sitting time correlates, multiple linear regression models were used. The design effect was considered when calculating all estimates. The reported overall mean sitting-time/day was 280.9 minutes. In the multivariate analysis, the following correlates were kept in the final model: gender; years of education; smoking; metabolic waste (Mets*·min*·week-1); working/day hours, and number of familial antecedents of obesity. The results pointed out sitting-time correlates and the need for health planning related to promotion and prevention policies.