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.

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.

Physical Activity � Addressing Effectively a Neglected Issue

There are four pillars in the treatment of Diabetes : (1) Diet (2) Exercise (3) Drugs (4) Education. Unfortunately, exercise advice to patients in the most proper and scientific way is often neglected. The focus of all guidelines has been to decrease the sedentary time and introduce a structured, individualized exercise or physical activity program in all patients with Diabetes. In fact, this should be a way of life and be introduced from the earliest years in childhood as a routine part of school curriculum. However, no patient should leave the doctors clinic without a formal prescription for regular exercise as per the individuals� requirement

Are physical inactivity, sitting time and screen time associated with obstructive sleep apnea in adults? A cross-sectional study

Abstract BACKGROUND: Sitting time, screen time and low physical activity (PA) levels have been associated with several diseases and all-cause mortality. PA is related to better sleep quality and absence of daytime sleepiness, along with lower risks of obstructive syndrome apnea (OSA). However, studies on the relationship between sitting time, screen time and OSA are scarce in the literature. OBJECTIVE: To analyze associations between PA levels, sitting time, screen time and OSA among adults with suspected sleep disorder. DESIGN AND SETTING: Cross-sectional study conducted at Hospital Israelita Albert Einstein. METHODS: Data were collected from 369 adults with suspected sleep disorders who visited the hospital's neurophysiology clinic between August 2015 and January 2017. RESULTS: Correlations between hypopnea and PA indicators were demonstrated for total sitting time (0.123; P = 0.019) and total screen time (0.108; P = 0.038). There was also a correlation between latency for rapid-eye-movement sleep (REM_LAT) and total sitting time (0.103; P = 0.047) and a negative correlation between mean oxyhemoglobin saturation (SaO_Avg) and total PA time (-0.103; P = 0.048). There were no associations between PA parameters and apnea-hypopnea index. After adjusting for confounding factors (body mass index, age and gender), sitting time and screen time were not associated with OSA. CONCLUSION: After adjusting for anthropometric and clinical factors, excessive sitting time or screen time was not associated with OSA in adults suspected of sleep disorders. Age, gender, hypertension, body mass index and waist circumference were associated with OSA.

Associations of objectively measured sedentary behavior and physical activity with cognitive function among older Japanese adults: An isotemporal substitution model / 体力科学

Increasing light-intensity physical activity (LPA) or moderate-to-vigorous physical activity (MVPA) and decreasing sedentary behavior (SB) are important to maintain cognitive function in older adults. However, there is a lack of studies examining the influence of replacing time spent in SB, LPA and MVPA on cognitive function. Therefore, this study applied an isotemporal substitution (IS) model approach to examine the associations of objectively measured SB, LPA, and MVPA on multiple cognitive functions in older adults. We analyzed data from 145 older persons (mean age, 75.1 ± 4.5 years; 61.4% women) in Kasama City, Japan. We assessed SB, LPA, and MVPA for seven consecutive days with a triaxial accelerometer. To evaluate the cognitive function, we used the Five-Cog test (character position referencing task, category cued recall task, clock drawing task, animal name listing task, and analogy task). The IS model of the multiple regression analysis was used to examine the effects of replacing time spent on one activity type with 30 minutes per day of SB, LPA, and MVPA on multiple cognitive functions, adjusting for age, gender, body mass index, education, smoking, sleep duration, history of stroke, medication for hypertension, dyslipidemia, and diabetes and accelerometer wear time. The results showed that reallocation from SB to LPA was significantly related to the category cued recall task score (B = 0.69, 95% confidence interval 0.07 - 1.31). In contrast, other reallocations were not associated with any cognitive tasks. The results suggest that substituting SB with LPA is positively associated with verbal episode memory among older Japanese adults.

Associations of Sedentary Time and Physical Activity with Metabolic Syndrome among Chinese Adults: Results from the China Health and Nutrition Survey / 生物医学与环境科学（英文）

Objective@#This study aimed to determine the independent and joint associations of sedentary time (ST) and physical activity (PA) with metabolic syndrome (MetS) and its components among Chinese adults.@*Methods@#The study analyzed data from 4,865 adults aged ≥ 18 years who participated in the 2009 and 2015 China Health and Nutrition Surveys (CHNS). Four types of leisure ST and three types of PA self-reported at baseline were collected. Multivariable logistic regressions were used to determine the independent and joint associations of ST and PA with the odds of MetS or its components.@*Results@#For independent effects, higher levels of television time and total leisure ST was associated with higher MetS risk [odds ratio ( @*Conclusions@#MVPA and total PA have independent preventive effects, and sedentary behavior (mainly watching TV) has an unsafe effect on MetS and its components. Strengthening the participation of MVPA and combining the LPA to replace the TV-based ST to increase the total PA may be necessary to reduce the prevalence of MetS in Chinese adults.

Caffeine intake reduces sedentary time and increases physical activity predisposition in obese police officers

Sedentary time is associated with increased obesity in police officers. Caffeine intake may reduce sedentary time but it has not been extensively investigated. In the present study, the effect of caffeine ingestion on sedentary time was investigated in obese police officers. Fourteen obese police officers ingested either 5 mg/kg of caffeine or cellulose (placebo) for six days. Information on inactivity time, time spent with physical activities, self-reported perception of tiredness, and physical activity disposition was obtained daily during the intervention period. Sedentary and physical activity times were divided into two intraday periods (T1: 08:00 am-02:00 pm and T2: 02:00 pm-08:00 pm). Caffeine intake decreased the sedentary time in both T1 (79.2±2.2%) and T2 (79.1±2.5%), when compared with T2 of the placebo condition (81.1±3.6%, P<0.05). Caffeine intake also increased the time spent on light physical activities in T1 and T2 (17±2 and 18±2%), when compared with T2 of the placebo condition (16±3%, P<0.05). In addition, sedentary time increased and light physical activity time decreased from T1 to T2 in the placebo (P<0.001) but not in the caffeine condition (P=0.81). Caffeine intake had no effect on tiredness (P>0.05), but it increased the self-reported physical activity disposition compared to the placebo condition (4.5±2.7 vs 3.2±2.3 units, P<0.05). Caffeine intake reduced the sedentary time and increased the time spent on light physical activities of obese police officers, which seems to be related to a higher disposition for the practice of physical activity.

Effects of physical activity, sedentary time, and sleep duration on hypertension prevalence in Chongqing / 西安交通大学学报(医学版)

Objective: To explore the effects of physical activity, sedentary time, and sleep duration on the prevalence of hypertension in Chongqing municipality through the cross-sectional study. Methods: A multi-stage stratified random sampling method was adopted to conduct the questionnaire survey and physical examination on permanent residents (age>15 years old) from 4 rural and 4 urban areas in Chongqing. Data on basic personal information were collected and analyzed. Binary logistic regression was used to find potential risk factors for hypertension. Results: A total of 15,280 subjects were enrolled in this study. According to the Chinese Hypertension Prevention Guideline 2010, the prevalence of hypertension in the whole population was 20.7%. The result of binary Logistic regression analysis demonstrated that MET ≤2.29 h/d, sedentary time≤6.1 h/d, and sleeping duration≤ 6 h/d or >9 h/d were the risk factors for hypertension while sedentary time between 4.1-6.0 h/d was the protective factor of hypertension in Chongqing. For high risk factor (MET≤2.29 h/d, sedentary time≥6.1 h/d, and sleep duration≤6 h/d), the percentage in the rural residents was higher than that in the urban residents. For protective factor (sedentary time: 4.1~6.0 h/d), the percentage in the rural residents was significantly lower than that in the urban residents. Conclusion: The prevalence of hypertension is high in Chongqing. Insufficient physical activity, long sedentary time, and insufficient/excessive sleep duration may increase the risk of hypertension. The higher prevalence of hypertension in rural areas may be correlated with insufficient physical activity, longer sedentary time, and insufficient/excessive sleep duration.

Association between daily sedentary time and frailty among people aged 50 years and over / 中华流行病学杂志

Objective@#To investigate the association between daily sedentary time and frailty among people aged 50 years and over.@*Methods@#Cross-sectional data was collected from the first wave of World Health Organization Study on global AGEing and adult health in China. A two-level (individual level and community level) logistic model was performed to identify the association between daily sedentary time and frailty. The dose-response relationship between them was analyzed by restrictive cubic spline curve.@*Results@#A total of 13 175 individuals aged 50 years and over were included for analysis. A positive association between daily sedentary time and frailty was noticed, both in urban (OR=1.22, 95%CI: 1.17-1.27) or rural areas (OR=1.11, 95%CI: 1.05-1.18) under study. The dose-response curve showed that daily sedentary time and frailty might present an approximate linear relationship.@*Conclusion@#Results from this study showed significant association exsited between daily sedentary time and frailty, approximately with a linear dose-response relationship.

Association between Physical Activity and Estimated Glomerular Filtration Rate in Adults

BACKGROUND: This study was conducted to examine the correlation between physical activity and estimated glomerular filtration rate (eGFR) in Korean adults.METHODS: We selected 6,546 adults aged >19 years from among the participants of the 2016 National Health and Nutrition Survey. Physical activity and sedentary time were measured using the global physical activity questionnaires developed by the World Health Organization. eGFR was calculated using the Modification of Diet in Renal Disease equation. After adjustment for covariates (age, marital status, hypertension, diabetes, myocardial infarction, drinking, smoking, total cholesterol level, body mass index, and C-reactive protein level), the correlations among physical activity, sedentary time, and eGFR were analyzed using multivariate linear regression analysis.RESULTS: No correlation was found between physical activity level and eGFR. However, sedentary time was significantly correlated with eGFR. The result showed that eGFR increased as sedentary time decreased.CONCLUSION: No correlation was found between physical activity level and eGFR in adults aged >19 years, but sedentary time was significantly correlated with eGFR. Further research is needed to clarify the relationship between physical activity and eGFR, using other physical activity indicators and changing the physical activity criteria.

Sedentary behavior is associated with physical activity, functional capacity, and a history of stroke in patients with heart failure. A cross-sectional study

Sedentary behavior (SB) has emerged as an important risk factor for poor health. Evidence showed that patients with heart failure (HF) exhibit high levels of SB, and that high SB increases mortality among such patients. We aimed to identify factors associated with SB in HF patients. Methods: A cross-sectional study was carried out with adults with HF and categorized under New York Heart Association (NYHA) functional class I-III. Sociodemographic, clinical, and health information were gathered. Evaluation of SB (by sitting time) and moderate-to-vigorous physical activity (MVPA) was performed by self-reported measures. Functional capacity was assessed using the Duke Activity Status Index. Simple and multivariate linear regression analyses were performed to identify the most suitable predictive model. Results: The sample (n = 80) comprised predominantly of patients in functional class I, men, and with an average age of 50.8 years. Time spent on SB totaled to 7.69 ± 2.35 h/day. Weekly volume of MVPA, functional capacity, and previous stroke were predictors of higher SB. Using simple linear regression analysis, the variables body mass index, quality of life, NYHA functional class, total comorbidities, dyslipidemia, MVPA in the leisure domain, and the use of diuretics, statins, and sildenafil were shown to have a statistically significant association with SB. Conclusion: In patients with HF, a longer time spent in SB was associated with low volumes of MVPA, low functional capacity, and history of stroke. More studies are needed to corroborate these findings.(AU)

Factors increasing the risk for psychosocial stress among Korean adults living in rural areas: using generalized estimating equations and mixed models

BACKGROUND: This study was conducted to analyze the distribution of the psychosocial well-being index among adults living in two rural communities in Korea and to examine its correlation with lifestyle variables such as sleep duration, regular exercise, and sedentary time. METHODS: Using the cohort data of the Atherosclerosis Risk of a Rural Area Korean General Population, this study examined 3631 participants living in Wonju and Pyeongchang in Gangwon Province; their preliminary data were established from 2005 to 2007 while their follow-up data were collected 3 years later. This study investigated demographic characteristics, lifestyle habits, disease history, Psychosocial Well-being Index-Short Form (PWI-SF) scores, sleep duration, regular exercise, and sedentary time during work. Using repeated measures ANOVA, this study examined how the variables and PWI-SF scores changed over the course of 3 years and identified the correlation between them based on mixed model analysis. Afterwards, using the generalized estimation equation, this study identified each variable's risk towards the PWI-SF high-risk group and performed a stratified analysis by occupation after dividing the participants into farmers and non-farmers. RESULTS: The PWI-SF high-risk group was found to be 18.9% of the participants from preliminary data and 15.5% from follow-up data. The odds ratio towards the PWI-SF high-risk group was 1.503 (95% CI 1.241–1.821) in the short sleep duration group and 1.327 (95% CI 1.136–1.550) in the non-regular exercise group. A stratified analysis by occupation showed that middle and long sedentary time in the white-collar group increased the risk toward the PWI-SF high-risk group. CONCLUSIONS: Short sleep duration, no regular exercise, and long sedentary time in the white-collar group were identified as risk factors toward the PWI-SF high-risk group in the rural communities, and policy interventions are needed to address this issue.

Adolescents'static behaviors and related factors in Shanghai / 上海预防医学

[Objective] To investigate and analyse the related factors of static behavior among ado-lescents , such as screen time , mild physical activity , moderate and vigorous physical activity , and nutri-tional status. [ Methods] In 2011, multistage sampling was done from 10 classes of three middle schools in three districts in Shanghai;the students filled the questionnaire on their own which recorded all of the activities of one school day and one weekend day .The data was analyzed by general describing analysis , correlation analysis, and Kruskal-Wallis test. [Results] The static time in weekend was 389.19 mi-nutes per day , the screen time was 122 .93 minutes per day , and both were over three times those on one school day .The static time was not related to moderate and vigorous physical activity , but was related to mild physical activity .The difference in mean time before the screen at weekend was statistically significant between obesity group , overweight group , normal group , low weight group and malnutrition group . [ Con-clusion] Adolescents lacked adequate physical activities in their spare time , and behavior before the screen might be related to their poor nutrition status .