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Objectives Participation in physical activity can improve mental health and well-being, but effects are mixed. This consensus statement from Sports Medicine Australia and the Australian Psychological Society aims to provide guidance to practitioners on the ways that physical activity can be promoted to maximise benefits to mental health. Method Following the Clinical Consensus Statement protocol, an expert group comprised of eight members with expertise in physical activity and mental health articulated recommendations regarding five physical activity contextual factors: type, physical environment, delivery, domain, and social environment. Results To optimise the mental health benefits of physical activity, we recommend: i) activity selection be guided by factors associated with adherence and enjoyment as opposed to any specific type (type); ii) facilitators (i.e., teachers, coaches, instructors, practitioners) deliver organised physical activity sessions using an instructional style that satisfies individuals' basic needs for autonomy, competence and social connection (delivery); iii) participation in physical activity with others who provide support, facilitate positive interactions, or make people feel valued, so long as it does not undermine a preference to be active alone (social environment); iv) where possible and appropriate, some physical activity should be undertaken outside in pleasant natural environments (physical environment); and, v) at least some physical activity be undertaken during leisure-time or via active travel, where possible prioritising activities one personally chooses to undertake (domain). Conclusions The type, domain, physical and social environment of physical activity, as well as the way in which it is delivered, will determine mental health outcomes. Practitioners can use these recommendations to optimise the effects of physical activity on mental health. peerReviewed

Lifestyle behaviors such as healthy diet and some forms of physical activity have been linked to lower risk of depressive symptoms in the general population. However, little is known regarding their associations with postnatal depressive symptoms. Given that postnatal women (particularly those living in socioeconomically disadvantaged neighborhoods) are more likely to have poorer diet quality, lower physical activity levels and greater risk of depressive symptoms, this study sought to determine the associations between diet quality, total and domain specific physical activity and depressive symptoms amongst postnatal women from socioeconomically disadvantaged neighborhoods. It was hypothesized that higher diet quality and levels of leisure-time physical activity would be associated with lower depressive symptoms. In 2007–2008, cross-sectional data were collected from 246 women living in socioeconomically disadvantaged neighborhoods in Victoria, Australia. Participants completed self-report measures of diet (using a 17 item dietary questionnaire), domain specific physical activity (International Physical Activity Questionnaire), and depressive symptoms (Centre for Epidemiologic Studies Depression Scale). Linear regression analyses were used to determine the associations between diet quality, physical activity and postnatal depressive symptoms. There was a significant inverse association between total physical activity (B, −0.009; 95% CI, −0.016 to −0.001; P = .023) and postnatal depressive symptoms. No association was found between other domain-specific physical activity (i.e. leisure-time, domestic or transport-related physical activity), or diet quality and postnatal depressive symptoms. Acknowledging the cross-sectional nature of this study, these findings suggest that total physical activity may play a more important role than diet quality in the relationship with postnatal depressive symptoms.

For the prevention and management of chronic diseases, global physical activity guidelines state that an adult should engage in regular moderate-to-vigorous aerobic physical activity (MVPA; e.g. walking, cycling, running) and muscle-strengthening exercise (MSE; e.g. strength/resistance training). However, the associations between combined MVPA-MSE with chronic health conditions are rarely examined in large population studies. In particular, little is known associations between combined MVPA-MSE with depressive disorders, one of the leading causes of disability worldwide. The aim of this study is to describe the associations between MVPA and MSE with depressive symptom severity among a large sample of U.S. adults. Data were drawn from the U.S. 2015 Behavioral Risk Factor Surveillance System. During phone interviews, MVPA, MSE and depressive symptom severity were assessed by validated questionnaires. Poisson regression with a robust error or variance were used to assess prevalence ratios (PR) of depressive symptom severity (mild, moderate, moderately severe/severe) across categories of physical activity guideline adherence (met neither [reference]; MSE only; MVPA only; met both), adjusting for a set of potential cofounders. Data were available on 17,839 adults (18-85 years). When compared with those meeting neither guideline, for mild, moderate and moderately severe/severe depressive symptoms, the PRs were lowest among meeting both guidelines (range: 0.26-0.54), followed by MVPA only (range: 0.36-0.62) and MSE only (range: 0.49-0.84). Among a large sample of U.S. adults, compared to other guideline adherence categories, meeting both MVPA-MSE guidelines was associated with a lowest likelihood of reporting depressive symptoms.

Background Mental health disorders are a leading cause of disability worldwide, including in first-time mothers. Understanding the associations between diet and depressive symptoms could assist in improving mental health status in this group. Objective Our aim was to determine the association between diet quality, fruit, vegetable, and fish consumption and depressive symptoms in first-time mothers aged 19 to 45 years. Design We analyzed cross-sectional, baseline data (3 months postpartum) from the Melbourne InFANT (Infant Feeding, Activity, and Nutrition Trial) Extend Program. Participants/setting Participants were first-time Australian mothers aged 19 to 45 years from the Geelong and Melbourne regions of Victoria, Australia (n=457). Main outcome measures A self-administered, 137-item food frequency questionnaire assessed dietary intake over the past year. Adherence to the 2013 Australian Dietary Guidelines was assessed using the Dietary Guideline Index as a measure of diet quality. Depressive symptoms were determined using the Center for Epidemiologic Studies Depression Scale. Statistical analysis performed Relationships between diet quality, fruit, vegetable, and fish intake and depressive symptoms were investigated using linear regression adjusted for relevant covariates (age, smoking status, sleep quality, education, physical activity status, and body mass index). Results Better diet quality, as indicated by a higher score on the Dietary Guideline Index, was associated with lower depressive symptoms after adjusting for relevant covariates (β=−.034; 95% CI −.056 to −0.012). There were no other associations between dietary intake and depressive symptoms. Conclusions Adherence to the Australian Dietary Guidelines was associated with better mental health status among first-time mothers. Further research, including longitudinal and intervention studies, are required to determine causality between dietary intake and depressive symptoms, which might help inform future public health nutrition programs for this target group.

Background Postnatal depression is a serious illness in new mothers. In the general population, physical activity (PA) has been found to reduce the risk of depression, whilst sedentary behaviour (SB; in particular television viewing) has been linked to higher levels of depressive symptoms, yet little is known regarding associations between PA, SB and postnatal depression. This study aimed to investigate associations between PA, television viewing and postnatal depressive symptoms in healthy primiparous mothers.. Methods Cross-sectional survey data were provided by 406 first-time mothers (approximately 3-months postpartum) enrolled in the Melbourne InFANT Extend trial (2012/2013). Women self-reported PA (time spent walking for leisure and transport, and other moderate and vigorous PA), television viewing, and depressive symptoms (CES-D 10). Random intercept linear models examined associations between PA, television viewing and depressive symptoms. Results In crude models total PA was inversely associated with risk of postnatal depressive symptoms (B = −0.122; 95% CI = −0.24, -0.01). In models adjusted for key sociodemographic and behavioural covariates the association did not remain statistically significant. No other associations between PA, television viewing and postnatal depressive symptoms were evident.. Conclusions Postnatal depressive symptoms may not be related to PA and television viewing in the same way that these behaviours predict depressive symptoms in the general population. Further investigation of the specific domains of PA, as well as different types/contexts of SB and their respective associations with postnatal depressive symptoms is warranted in order to better inform development of targeted interventions aimed at enhancing postnatal mental health..

The aims of this commentary are to (1) examine the current global physical activity recommendations for adults and its relation to mental health, based on findings from meta-analyses primarily of prospective studies, and (2) determine whether there is a need to extend the scope/focus of existing guidelines to ensure they are mental health informed.

Limited longitudinal evidence of the predictors of physical activity (PA) patterns over time exists, particularly among high-risk groups such as women living in socioeconomically disadvantaged areas. This study aimed to: 1) describe leisure-time PA (LTPA) and transport-related PA (TRPA) patterns over time; and 2) identify individual, social and physical environmental predictors of LTPA and TRPA patterns over five years. Baseline (2007–08) data were collected and analysed (2016–18) from n = 4349 women (18–46 years) from disadvantaged areas of Victoria, Australia. Three- and five-year follow-up data were collected in 2010–11 (n = 1912) and 2012 (n = 1560). LTPA and TRPA were self-reported using the International Physical Activity Questionnaire, and patterns categorised as consistently low, persistently increasing, persistently decreasing, or inconsistent. Compared to a consistently low LTPA pattern, greater family support predicted both persistent decreases (odds ratio [OR] 1.20, 95% CI 1.05–1.36) and persistent increases (OR 1.17, 95% CI 1.04–1.32) in LTPA, while access to childcare predicted inconsistent LTPA patterns (OR 1.66, 95% CI 1.03–2.65). For both LTPA and TRPA, PA enjoyment predicted persistent increases (LTPA: OR 1.05, 95% CI 1.02–1.10; TRPA: OR 1.03, 95% CI 1.00–1.07), persistent decreases (LTPA: OR 1.04, 95% CI 1.00–1.08; TRPA OR 1.04, 95% CI 0.99–1.08), and inconsistent patterns (LTPA: OR 1.04, 95% CI 1.02–1.07; TRPA: OR 1.03, 95% CI 1.01–1.06). Although directionality was inconsistent, and the magnitude of effects were small, PA enjoyment, family social support for PA and access to childcare warrant further investigation and consideration as potentially key factors impacting PA patterns among women living in socioeconomically disadvantaged areas.

Statement of problem Associations between sedentary behavior (e.g. time spent sitting watching TV/using the computer) and physical health have been well documented, however, studies are increasingly reporting a positive relationship between certain sedentary behaviors and poor mental health (e.g. depression). Little is known about the underlying factors that may explain the link between sedentary behavior and likelihood of depression. The purpose of this study was to investigate the contribution of selected intra-personal and social factors as potential mediators of the relationship between sedentary behavior and depressive symptoms among women from disadvantaged neighborhoods. Method Cross-sectional survey data were provided by 4065 women (aged 18–45) living in disadvantaged neighborhoods. Women self-reported their sedentary behavior (total sitting time and screen time), depressive symptoms (CES-D 10), as well as a number of intra-personal (leisure-time physical activity, diet quality, weight status) and social (social cohesion, interpersonal trust, club membership) factors. Results Mediating analyses, controlling for confounders, showed that women's leisure-time physical activity partly mediated the relationship between total sitting time and increased likelihood of depressive symptoms. Women's diet quality, and social cohesion partly mediated the relationship between screen time and increased likelihood of depressive symptoms. Conclusions Acknowledging the cross-sectional study design, findings suggest that there may be several factors that explain the increased likelihood of depressive symptoms associated with greater sedentary time. Although future studies should test the mediating relationships longitudinally, these findings may help inform interventions aimed at reducing the likelihood of depression in disadvantaged women with high sitting time.

Context Postnatal depression is highly prevalent in mothers. Although physical activity has been found to reduce the risk of depression in the general population, little is known regarding its link with postnatal depression. This review examined original research investigating the relationship between physical activity and sedentary behavior dose (frequency, intensity, and duration) and domain, and postnatal depressive symptoms. Evidence acquisition A systematic search for original research investigating the relationship between physical activity and sedentary behavior dose and domain, and postnatal depressive symptoms, was performed using several electronic databases in early 2012. A total of ten observational and seven intervention studies were included. Evidence synthesis Most studies (one cross-sectional, two longitudinal, and six intervention studies) found an inverse association between postpartum leisure-time physical activity (LTPA) and postnatal depressive symptoms. One longitudinal study found that occupational physical activity was positively associated with postnatal depressive symptoms. There was inconclusive evidence to suggest an optimal dose of postpartum physical activity for reducing postnatal depressive symptoms. Two longitudinal studies found an inverse association between antenatal LTPA and presence of postnatal depressive symptoms. One of two studies that investigated sedentary behavior found a positive cross-sectional association between sedentary behavior and presence of postnatal depressive symptoms. Conclusions Although studies are limited, on balance, LTPA prior to, during, and after pregnancy may be important for reducing the risk of postnatal depression. Further research is required to determine the optimal dose and domain of physical activity for reducing postnatal depressive symptoms as well as to examine the link between sedentary behavior and postnatal depressive symptoms.

Objective Recent studies have found linked sedentary behavior (e.g. Television viewing) with risk of depression. Socio-economically disadvantaged women comprise one group at high risk of both sedentary behavior and depression; hence it is important to explore the influences on sedentary behavior amongst this target group. This study assessed perceived influences on sedentary behavior (particularly television viewing) amongst women living in disadvantaged neighborhoods and experiencing depressive symptoms, as well as potential strategies to reduce sedentary behavior amongst this target group. Methods Eighteen women (aged 18–46) living in disadvantaged neighborhoods and experiencing depressive symptoms (assessed using the CES-D 10) participated in semi-structured telephone interviews which assessed intra-personal, social and physical environmental influences on sedentary behavior. Women were also encouraged to suggest strategies that may assist in reducing sedentary behavior. Thematic analyses were performed on transcribed interview data. Results The qualitative data revealed four key themes relating to influences on television viewing: depression, childhood television habits, weather, and the impact of children. Strategies which were suggested by women to reduce sedentary behavior included time management/multi-tasking and standing versus sitting. Conclusions Women were able to suggest few strategies to explicitly reduce sedentary behavior, indicating the need for further promotion, education and research.

Statement of problem: Associations between sedentary behavior (e.g. time spent sitting watching TV/using the computer) and physical health have been well documented, however, studies are increasinglyreporting a positive relationship between certain sedentary behaviors and poor mental health (e.g.depression). Little is known about the underlying factors that may explain the link between sedentarybehavior and likelihood of depression. The purpose of this study was to investigate the contribution ofselected intra-personal and social factors as potential mediators of the relationship between sedentarybehavior and depressive symptoms among women from disadvantaged neighborhoods.Method: Cross-sectional survey data were provided by 4065 women (aged 18e45) living in disadvan-taged neighborhoods. Women self-reported their sedentary behavior (total sitting time and screen time),depressive symptoms (CES-D 10), as well as a number of intra-personal (leisure-time physical activity,diet quality, weight status) and social (social cohesion, interpersonal trust, club membership) factors.Results: Mediating analyses, controlling for confounders, showed that women’s leisure-time physicalactivity partly mediated the relationship between total sitting time and increased likelihood ofdepressive symptoms. Women’s diet quality, and social cohesion partly mediated the relationship be-tween screen time and increased likelihood of depressive symptoms.Conclusions: Acknowledging the cross-sectional study design, findings suggest that there may be severalfactors that explain the increased likelihood of depressive symptoms associated with greater sedentarytime. Although future studies should test the mediating relationships longitudinally, these findings mayhelp inform interventions aimed at reducing the likelihood of depression in disadvantaged women withhigh sitting time. 2013 Elsevier Ltd. All rights reserved.