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The objective of the present study was to estimate whether physical activity on one day was associated with both sleep quality and quantity the following night and to examine to what extent sleep on one night was associated with physical activity the next day. We collected data from 33 young adults who were overweight or obese and consistently wore a Fitbit Charge 3. A total of 7094 days and nights were analyzed. Person-specific models were conducted to test the bi-directional associations for each participant separately. Results suggest an absence of association between steps and sleep efficiency in the two directions. More heterogeneous results were observed for the association between steps and total sleep time, with 19 participants (58%) showing a negative association between total sleep time and next day steps, and 9 (27%) showing a negative association between steps and next day total sleep time. Taken together, these results suggest a potential conflicting association between total sleep time and physical activity for some participants. Pre- and post-print doi: https://doi.org/10.31236/osf.io/nfjqv; supplemental material: https://osf.io/y7nxg/., Author(s): Guillaume Chevance [sup.1] , Dario Baretta [sup.2] , Ahmed Jérôme Romain [sup.3] [sup.4] , Job G. Godino [sup.5] [sup.6] [sup.7] , Paquito Bernard [sup.4] [sup.8] Author Affiliations: (1) grid.434607.2, [...]

Physical activity (PA) is recommended to optimize well-functioning in people with schizophrenia. PA has been found to improve quality of life, general symptomatology, depression, anxiety and stress symptoms, global and social functioning. In PA research, most of the interventions are based on one-on-one interventions but there is poor information about group-based PA interventions. Using a randomized controlled, clinician-blinded trial, subjects are randomized into two arms: the PA group or control group. Our first objective is about to evaluate the effects of a multimodal 6 week collective PA intervention on depression, anxiety, and stress symptoms in people with schizophrenia. Our second objective is about to evaluate these effects on secondary outcomes especially smoking, well-being, physical fitness and on care utilization. All participants are evaluated before and after the 6 week intervention period, and only participants in the PA group are called in a follow-up interview 3 and 6 months after the intervention. Trial registration Individual Protection Committee of Ile-de-France II, n ID RCB: 2018- A00583-52. Registered on 8 April 2018. [ABSTRACT FROM AUTHOR]

A meta-analysis of randomized controlled trials (RCTs) has recently showed that theory-based interventions designed to promote physical activity (PA) significantly increased PA behavior. The objective of the present study was to investigate the moderators of the efficacy of these theory-based interventions. Seventy-seven RCTs evaluating theory-based interventions were systematically identified. Sample, intervention, methodology, and theory implementation characteristics were extracted, coded by three duos of independent investigators, and tested as moderators of interventions effect in a multiple-meta-regression model. Three moderators were negatively associated with the efficacy of theory-based interventions on PA behavior: intervention length (=14 weeks; ß = -0.22, p = 0.004), number of experimental patients (ß = -0.10, p = 0.002), and global methodological quality score (ß = -0.08, p = 0.04). Our findings suggest that the efficacy of theory-based interventions to promote PA could be overestimated consequently due to methodological weaknesses of RCTs and that interventions shorter than 14 weeks could maximize the increase of PA behavior.

Background Data on meeting the Canadian 24-Hour Movement Guidelines for adults (24-H Guidelines) and associations with health indicators by body mass index (BMI) class are needed to support public health surveillance. The aim of this study was to describe the proportion of Canadian adults meeting individual and various combinations of the 24-H Guidelines by BMI class and their association with health indicators. Data and methods Data from the cross-sectional Canadian Health Measures Survey cycles 1 to 4 (2007 to 2015, n = 10,515 adults aged 18 to 79 years) were used. Daily time spent in moderate-to-vigorous physical activity (MVPA) and sedentary behaviour were assessed using accelerometry. Sleep duration, recreational screen time, chronic conditions, sociodemographic characteristics, and general and mental health were self-reported. The BMI, waist circumference, blood pressure and aerobic fitness were directly measured. Respondents were classified as meeting the 24-H Guidelines when * the MVPA was 150 minutes per week or more * sedentary time was nine hours or less per day * recreational screen time was three hours or less per day * sleep duration was seven to nine hours per day for individuals aged 18 to 64 years or seven to eight hours per day for individuals aged 65 years and older. Results Significantly fewer adults with overweight (6.1%) or class I (4.3%) and class II or III (3.9%) obesity met all three 24-H Guidelines compared with those with normal weight (9.5%). Meeting all three or two recommendations of the 24-H Guidelines was generally associated with a lower waist circumference, higher aerobic physical fitness and self-perceived general health regardless of BMI class. Interpretation Canadian adults living with overweight and obesity are less likely to meet the 24-H Guidelines. Most of the benefits associated with meeting the 24-H Guidelines are observed regardless of BMI status. [ABSTRACT FROM AUTHOR]

This study aimed to explore the preferences, self-efficacy to overcome barriers and motives for physical activity of individuals with severe obesity (body mass index ≥35 kg/m2). 44 adults with severe obesity (50.5 ± 13.3 years, 80% female) consented to participate in this study. Accelerometers, the 6-minute walking test, and questionnaires were used to collect data on participants' sociodemographic and medical characteristics, physical fitness, physical activity behaviour, preferences for physical activity, self-efficacy to overcome physical activity barriers and motives for physical activity. A preference for walking (89%) and engaging in supervised physical activity (61%) at moderate intensity (46%) was reported. Most participants (71%) preferred engaging in physical activity outdoors for a duration of 30 to 60 min (84%), either in the morning (64%) or in the evening (48%). Participants had the lowest self-efficacy to overcome physical activity barriers when they had poor health and pain. The two most frequently reported physical activity motives were: preventing health problems and having better health. A preference-based program focusing on health motives and addressing health and pain issues may help to promote physical activity behaviour among adults with severe obesity. Nevertheless, experimental studies are needed to determine if such strategies effectively increase physical activity behaviour in this population. Physical activity preferences (i.e., walking, biking and swimming performed at a moderate intensity and outdoors for a duration of 30 minutes to 1 hour with supervision) can be used to enhance motivation in people with severe obesity. Addressing the main barriers of regular physical activity (e.g., poor health, pain, depression) could ensure better adherence to physical activity in people with severe obesity. Using motives of health improvement and health problems prevention could lead to increased physical activity in people with severe obesity. [ABSTRACT FROM AUTHOR]