Feasibility and acceptability of study methods and psychosocial interventions for body image among women diagnosed with breast cancer: A systematic review and narrative synthesis.

OBJECTIVE: This systematic review aimed to summarize evidence for the feasibility and acceptability of psychosocial interventions for body image among women diagnosed with breast cancer and the study methods used to evaluate the interventions in question. METHODS: Articles were identified via MEDLINE, CINAHL, CENTRAL, PsychINFO, and EMBASE. Inclusion criteria were: (1) peer-reviewed publication in English from 2000 onward with accessible full-text, (2) reported data on the feasibility and/or acceptability of psychosocial interventions and/or study methods, (3) included at least one measure of body image or reported a body-related theme, and (4) sample comprised women diagnosed with breast cancer. All study designs were eligible. Two reviewers independently performed study selection, data extraction, and quality assessment. RESULTS: Sixty-two articles were included. Participants and comparator groups varied as did interventions. Feasibility and acceptability of the interventions and study methods were inconsistently operationalized and reported across studies. Evidence of feasibility and acceptability was heterogeneous within and across studies, though mostly positive. CONCLUSION: Published psychosocial interventions for body image and study methods are generally feasible and acceptable. Findings should be used to advance the development, implementation, and evaluation of interventions designed to improve outcomes (body image or otherwise) for women diagnosed with breast cancer. SYSTEMATIC REVIEW REGISTRATION: This review was registered with the International Prospective Register of Systematic Reviews (PROSPERO; ID: CRD42021269062, 11 September 2021).

Physical activity and physical fitness assessments in adolescents and young adults diagnosed with cancer: a scoping review.

PURPOSE: This scoping review describes the assessment methodologies for physical activity (PA) and physical fitness assessments used in studies focusing on adolescents and young adults (AYAs) diagnosed with cancer. METHODS: A search of the literature was conducted in PubMed, CINAHL, Web of Science, and Cochrane Library following the PRISMA-ScR statement. A total of 34 studies were included in this review. RESULTS: PA was primarily assessed via self-reported questionnaires (30/34) either completed in-person (n = 17) or online (n = 13) at different time points and different stages along the cancer trajectory (i.e., from diagnosis onward). A total of 9 studies conducted a physical fitness assessment. CONCLUSIONS: PA and physical fitness measurements are key when trying to describe outcomes, assess for associations, track changes, measure intervention adherence, and test intervention efficacy and effectiveness. Considerable heterogeneity across studies was reported limiting the generation of formal recommendations or guidance for researchers, healthcare providers, and policy makers.

An evaluation of the Interdisciplinary Psychosocial Oncology Research Group and Laboratory: An initiative to enable intersectoral and interdisciplinary collaboration.

Background: Psychosocial oncology (PSO) is an interdisciplinary field that is often practised and researched in disciplinary silos. The Interdisciplinary PSO Research Group and Laboratory (IPSORGL) was developed in Ottawa (Ontario) to foster interdisciplinary collaboration and training amongst trainees, healthcare professionals (HCPs), and researchers. Methods: The research team conducted an implementation and outcome evaluation of the IPSORGL. Data were collected using sequential mixed methods, including surveys and interviews. Results: Eight trainees, six HCPs, and five researchers completed the survey. Six trainees and four HCPs participated in an interview. Benefits of the IPSORGL included establishing interdisciplinary connections and collaborations and obtaining unique training in a supportive environment. Challenges included members' differing preferences for meeting formats and content, and difficulties prioritizing the IPSORGL over other academic or clinical demands. Conclusions: The IPSORGL fosters essential interdisciplinary training and collaboration, which bolsters psychosocial oncology research and practice. The sustainability of such initiatives, however, requires formal institutional support.

Exploring cancer survivors' experiences in a group-based walking program before and during the COVID-19 pandemic: a qualitative study.

PURPOSE: Physical activity (PA) can help reduce side effects related to cancer whilst promoting quality of life. This qualitative study explored cancer survivors' experiences in an 8-week group-based walking program with behavioural support that was delivered within the community to highlight factors central to successful adoption and sustainability of such programs. METHODS: Eleven cancer survivors who took part in the program before (n = 7) or during (n = 4) the COVID-19 pandemic were interviewed and asked to discuss their PA behaviour, motivation to join and complete the program, and experienced benefits and barriers, as well as offer feedback that could be incorporated into future programs. Interview transcripts were thematically analysed using a hybrid deductive-inductive approach. RESULTS: Participants' experiences were summarised into six themes: (1) PA behaviour and motivation were enhanced, (2) seeking accountability to take steps for better health, (3) mutual support encourages in-group bonding, (4) placing value on building PA confidence, (5) the impact of the COVID-19 pandemic and (6) recommendations for future programs. By receiving social and behavioural support, and thus experiencing increased PA confidence, participants felt the program supported their PA behaviour. However, key differences were evident for participants attending the program during the pandemic. CONCLUSIONS: Exploring strategies that foster a communal focus amongst participants within community-based walking programs may be beneficial. Moreover, findings underscore the value of offering PA programming (walking or otherwise) with behavioural support during a pandemic with appropriate safety measures, though social relationships may not be fully fostered.

Physical activity motives have a direct effect on mental health.

Physical activity (PA) motives are associated with both moderate-to-vigorous intensity PA (MVPA) and mental health. Studies examining whether PA motives relate directly to mental health or indirectly through MVPA are lacking. This study examined the direct effect of five PA motives (i.e., enjoyment, competence, fitness, social, appearance) on mental health and their indirect effects through MVPA in adolescents. A total of 424 participants (57.1% females) ages 14-15 years from the longitudinal MATCH study were included. Mediation analyses, based on the counterfactual framework, assessed the natural direct effect of PA motives on mental health, and the natural indirect effects through MVPA. Separate models were conducted for each PA motive. Natural direct effects were observed for enjoyment ( ß Ì‚ [95%CI] = 2.12 [0.34, 3.90]), competence ( ß Ì‚ [95%CI] = 1.58[0.28, 2.88]), fitness ( ß Ì‚ [95%CI] = 1.42[0.04, 2.80]), and social ( ß Ì‚ [95%CI] = 2.32[1.03, 3.60]) motives. No natural direct effects were observed for appearance motives. A natural indirect effect through MVPA was observed for fitness motives, and no other natural indirect effects were found. Interventions and public health strategies in adolescents need to acknowledge the importance of enjoyment, competence social and fitness motives in PA to promote mental health, and integrate specific recommendations on the importance of the reasons why adolescents participate in PA.

A qualitative study exploring middle-aged women's experiences with yoga.

The purpose of this study was to explore how yoga impacts body-related thoughts, feelings, perceptions and attitudes, well-being, and self-care behaviors in a sample of middle-aged women who regularly engage in yoga in their communities. The sample included 22 women; 10 self-identified as beginners or novices and 12 self-identified as experienced in yoga. Interpretive phenomenological analysis guided the data collection, analysis, and interpretation. Four key themes were identified around the topics of: supportive yoga environment, mindfulness, self-care behaviors, and body-related perceptions. Results highlight potential elements of yoga that can support positive body-related experiences in middle-aged women.

A scoping review of measures used to assess body image in women with breast cancer.

OBJECTIVE: The emergence of body image studies in the oncology setting has led to the use of numerous measures to assess different dimensions of body image. The present study is a scoping review of the literature on body image in women with breast cancer to describe: measures used to assess body image in women with breast cancer, dimensions the measures used tap into, and gaps and issues needing attention going forward. METHODS: Three databases were searched for peer-reviewed original studies that had: (1) full-texts available in English; (2) focused on women with breast cancer; and (3) assessed body image. RESULTS: The search yielded 3,729 peer-reviewed articles; after screening, 562 articles met inclusion criteria. Of the 88 measures used, 28 were used in more than two studies and analyzed herein. The European Organization for Research and Treatment of Cancer Breast Cancer-Specific Quality of Life Questionnaire constituted the most frequently used measure. Most measures used focused on the affective dimension of body image (n = 24/28, 85.7%), followed by the cognitive (n = 20/28, 71.4%), behavioral (n = 13/28, 46.4%), and perceptual dimensions (n = 13/28, 46.4%). CONCLUSIONS: This review provides a current summary of measures used to assess body image in women with breast cancer. Although some further development and refinement of body image measures could benefit the field, depending on the questions researchers or clinicians seek to answer, there are many available for use. Future research should use these measures to assess the effectiveness of interventions aimed at improving body image in women with breast cancer across the lifespan.

A proof-of-concept sub-study exploring feasibility and preliminary evidence for the role of physical activity on neural activity during executive functioning tasks among young adults after cancer treatment.

BACKGROUND: Executive functioning (EF) deficits are troubling for adolescents and young adults (AYAs) after cancer treatment. Physical activity (PA) may enhance neural activity underlying EF among older adults affected by cancer. Establishing whether PA enhances neural activity among AYAs is warranted. As part of a two-arm, mixed-methods pilot randomized controlled trial (RCT), this proof-of-concept sub-study sought to answer the following questions: (1) is it feasible to use neuroimaging with EF tasks to assess neural activity changes following a 12-week PA intervention? And (2) is there preliminary evidence that a 12-week PA intervention enhances neural activity among AYAs after cancer treatment? METHODS: AYAs in the pilot RCT were approached for enrollment into this sub-study. Those who were eligible and enrolled, completed functional magnetic resonance imaging (fMRI) with EF tasks (letter n-back, Go/No Go) pre- and post-PA intervention. Sub-study enrollment, adherence to scheduled fMRI scans, outliers, missing data, and EF task performance data were collected. Data were analyzed with descriptive statistics, blood oxygen level dependent (BOLD) analyses, and paired sample t-tests. RESULTS: Nine eligible participants enrolled into this sub-study; six attended scheduled fMRI scans. One outlier was identified and was subsequently removed from the analytical sample. Participants showed no differences in EF task performance from pre- to post-PA intervention. Increases in neural activity in brain regions responsible for motor control, information encoding and processing, and decision-making were observed post-PA intervention (p < 0.05; n = 5). CONCLUSIONS: Findings  show that fMRI scans during EF tasks detected neural activity changes (as assessed by the BOLD signal) from pre- to post-PA intervention. Results thus suggest future trials confirming that PA enhances neural activity underlying EF are needed, though feasibility issues require careful consideration to ensure trial success. TRIAL REGISTRATION: clinicaltrials.gov, NCT03016728. Registered January 11, 2017, clinicaltrials.gov/ct2/show/NCT03016728.

Understanding adolescents' and young adults' self-perceptions after cancer treatment in the context of a two-arm, mixed-methods pilot randomized controlled physical activity trial.

PURPOSE: The self-perceptions of adolescents and young adults (AYAs) after cancer treatment are not well understood. As part of a two-arm, mixed-methods pilot randomized controlled trial (RCT), this qualitative sub-study explored AYAs' self-perceptions after cancer treatment and investigated how physical activity (PA) may contribute to their self-perceptions. METHODS: Data were collected from 16 AYAs who completed cancer treatment and who participated in a two-arm, mixed-methods pilot RCT. Recruited AYAs were randomized to a 12-week PA intervention or a wait-list control group, and semi-structured interviews were conducted at baseline (pre-randomization) and 12 weeks later (post-intervention or post-waiting period) to elicit discussions on self-perceptions and PA. Data were analyzed thematically using inductive and deductive approaches. The exercise and self-esteem model (EXSEM) was the theoretical lens for the deductive analysis. RESULTS: Data were organized into four unified main themes: (1) I came out on top and am (re)discovering myself, (2) Comparison to my past self and others induces negative feelings, (3) My changed body brings me down, but it does not rule my life, and (4) My previous experience with PA informs my expectations for my future PA, and two themes contingent on group allocation: (5) Participating in a PA program made me feel better about myself, and (6) I did not notice any changes while waiting for the PA program, but I am anticipating support. CONCLUSION: AYAs' self-perceptions are amenable to change, positively and negatively valenced, and influenced by PA. Although the EXSEM captured intrapersonal factors related to AYAs' self-perceptions after cancer treatment, interpersonal and contextual factors beyond the EXSEM also shaped their self-perceptions. TRIAL REGISTRATION: Clinicaltrials.gov , NCT03016728. Registered January 11, 2017.

Health beliefs and engagement in moderate-to-vigorous-intensity physical activity among cancer survivors: a cross-sectional study.

PURPOSE: Moderate-to-vigorous-intensity physical activity (PA) can alleviate many adverse side effects and symptoms caused by cancer treatments; yet, most cancer survivors are insufficiently active. Evidence shows that theory-based PA behavior change interventions are more effective than non-theory-based interventions; thus, it is necessary to ascertain modifiable theoretical factors associated with moderate-to-vigorous-intensity PA among cancer survivors. Drawing on the health belief model (HBM), the associations between moderate-to-vigorous-intensity PA and (1) perceived susceptibility to cancer recurrence and health problems, (2) perceived severity of cancer recurrence and health problems, (3) perceived benefits of PA for reducing risk of cancer recurrence and health problems, (4) perceived barriers to PA, and (5) PA barrier self-efficacy among cancer survivors were examined. METHODS: A total of 123 adult cancer survivors (Mage = 50.1 ± 15.5 years; 82.9% female) completed an online self-report survey assessing sociodemographic and medical characteristics, moderate-to-vigorous-intensity PA, and the HBM constructs. Data were analyzed descriptively and using hierarchical linear regression analysis. RESULTS: After adjusting for age, sex, body mass index, time since cancer diagnosis, and treatments received, the HBM constructs collectively explained 29% of the variance in moderate-to-vigorous-intensity PA. Perceived benefits of PA (ß = .20, 95% CI [1.81, 11.67], p = .007) and PA barrier self-efficacy (ß = .42, 95% CI [0.26, 0.53], p < .001) were significantly associated with moderate-to-vigorous-intensity PA. CONCLUSION: Raising awareness of the benefits of PA for reducing risk of cancer recurrence and health problems and strengthening self-efficacy to overcome PA barriers may help to promote cancer survivors' attainment of moderate-to-vigorous-intensity PA guidelines.

Exploring adolescent girls' experiences of body talk in non-aesthetic sport.

INTRODUCTION: Body image concerns may contribute to poor sport experiences and low sport participation in girls. Objectification theory and evidence from studies in non-sport contexts suggests body talk may elicit an environment that fosters negative body image. However, the phenomenon of body talk within adolescent girls sport is not well-understood from an in-depth person-centered perspective. Therefore, the purpose of the present study was to explore adolescent girl athletes' experiences of body talk within sport. METHODS: Twenty Canadian girl athletes (ages 14-18 years) enrolled in team-based non-aesthetic sports participated in one semi-structured interview. Using a qualitative description approach, an inductive thematic analysis was used to generate three themes. RESULTS: "Body talk as a performance tactic" highlighted complimentary and negative body talk pertaining to sport performance came from coaches, opposing players, and parents. "Casual conversations and body talk" reflected body talk from teammates and male spectators that was not specific to sport but occurred in the sport context. "Coping with body talk" reflected strategies athletes used to combat negative body talk from teammates, and reflected the athletes' perceptions that negativity towards the body is normative. CONCLUSIONS: Body talk served many purposes within sport; researchers should further explore the diverse motivations and perceived utility of body talk across sport stakeholders. Creating standardized resources and policies to eliminate body talk may foster more positive and supportive sport experiences for girls.

Associations between physical activity motives and trends in moderate-to-Vigorous physical activity among adolescents over five years.

This study examined the longitudinal associations between five physical activity (PA) motives and moderate-to-vigorous PA (MVPA) across a 5-year period spanning late childhood to middle adolescence.METHODS: Data (n = 937; 55% girls; mean age = 10.33 years) were drawn from the Monitoring Activities for Teenagers to Comprehend their Habits study. PA motives and MVPA were assessed 15 times over the course of 5 years. Measurement invariance for the Motives for Physical Activity Measure-Revised (MPAM-R) questionnaire was established, and sex-stratified mixed-effects regression models were analysed.MVPA increased until a mean age of 12.18 years for girls and 12.89 years for boys before decreasing through the final assessment. From late childhood to middle adolescence, for boys, enjoyment motives were positively (ß(95% CI) = 6.14(3.86-8.43)), while fitness motives were negatively (ß(95% CI) = -4.80(-8.0, -1.59)) associated with MVPA. Whereas, for girls, competence motives were positively ß(95% CI) = 3.44(1.59-5.28)) associated with MVPABoys may benefit from PA interventions, if these were primarily aimed at increasing ones' enjoyment, whereas developing a girl's competence may provide greater contributions to a girl's future PA behaviours. PA interventions should avoid promoting the desire to be active to improve fitness, particularly among boys.

Investigating physical activity knowledge and beliefs as correlates of behaviour in the general population: a cross-sectional study.

This study examines knowledge of physical activity (PA) guidelines for cancer prevention and beliefs of the role of PA in preventing cancer as correlates of moderate-to-vigorous intensity PA (MVPA) behaviour among adults. Measures assessing socio-demographic characteristics, knowledge of PA guidelines, and PA beliefs and behaviour were completed online by 654 adults (Mage = 36.92 ± 14.61 years) with no history of cancer. Data were analyzed descriptively and using unadjusted and adjusted logistic regression analysis. Approximately half the sample was aware of PA guidelines for cancer prevention (49.24%) and believed that PA was extremely effective in reducing the risk of developing cancer (48.93%). Knowledge of PA guidelines for cancer prevention was associated with a greater likelihood of being active (unadjusted odds ratio [OR]: 1.66, 95% confidence interval [95% CI]: 1.18-2.34; p <.01; adjusted OR: 2.05, 95% CI: 1.36-3.11; p <.001). Beliefs regarding the effectiveness of PA in preventing cancer was not associated with a greater likelihood of being active. There is a lack of awareness of current PA guidelines for cancer prevention. Experimental studies are needed to further explore if increasing adults' knowledge of PA guidelines for cancer prevention can enhance PA levels.

Feasibility and acceptability of a telehealth behavior change intervention for promoting physical activity and fruit and vegetable consumption among rural-living young adult cancer survivors.

Purpose: We assessed the feasibility and acceptability of a 12-week telehealth behavior change intervention to promote physical activity and fruit and vegetable consumption among rural-living young adult cancer survivors.Methods: Participants met with a health coach once a week for 60 minutes for 12 weeks. Feasibility measures included rates of recruitment, enrollment, attrition, retention, adherence, and missing data. Acceptability was assessed using semi-structured interviews.Findings: Over 1-year, 18 individuals self-referred, 9 were eligible and consented to participate, and 2 dropped out. Retention was 74% and adherence was 95%. Participants considered the length of the intervention, synchronous communication with the health coach, and the distance-based delivery mode to be acceptable. Moreover, participants described key behavior change techniques and recommended minor changes.Implications: Findings provide information that can help refine future trials seeking to increase access to behavior change interventions and optimize participation in health-promoting behaviors for underserved populations.Trial registration: ClinicalTrials.gov. NCT03691545. Registered on October 1, 2018.

Work-related factors predict changes in physical activity among nurses participating in a web-based worksite intervention: A randomized controlled trial.

BACKGROUND: Despite the numerous benefits associated with physical activity (PA), most nurses are not active enough and few interventions have been developed to promote PA among nurses. A secondary analysis of raw data from a single-centre, three-arm parallel-group randomized controlled trial was conducted to assess whether work-related characteristics and general mood states predict changes in total weekly moderate-to-vigorous intensity PA (MVPA) and average daily step-count among nurses participating in a 6-week web-based worksite intervention. METHODS: Seventy nurses (meanage: 46.1 ± 11.2 years) were randomized to an individual-, friend-, or team-based PA challenge. Participants completed questionnaires pre- and post-intervention assessing work-related characteristics (i.e., shift schedule and length, number of hours worked per week, work role) and general mood states (i.e., tension, depression, anger, confusion, fatigue, vigour). Participants received a PA monitor to wear before and during the 6-week PA challenge, which was used to assess total weekly MVPA minutes and average daily step-count. Data were analyzed descriptively and using multilevel modeling for repeated measures. RESULTS: Change in total weekly MVPA minutes, but not change in average daily step-count, was predicted by shift schedule (rotating vs. fixed) by time (estimate = - 17.43, SE = 6.18, p = .006), and work role (clinical-only vs. other) by time (estimate = 18.98, SE = 6.51, p = .005). General mood states did not predict change in MVPA or change in average daily step-count. CONCLUSIONS: Given that nurses who work rotating shifts and perform clinical work showed smaller improvements in MVPA, it may be necessary to consider work-related factors/barriers (e.g., time constraints, fatigue) and collaborate with nurses when designing and implementing MVPA interventions in the workplace. TRIAL REGISTRATION: ClinicalTrials.gov: NCT04524572 . August 24, 2020. This trial was registered retrospectively. This study adheres to the CONSORT 2010 statement guidelines.

Study protocol of the Aerobic exercise and CogniTIVe functioning in women with breAsT cancEr (ACTIVATE) trial: a two-arm, two-centre randomized controlled trial.

BACKGROUND: Up to 75% of women diagnosed with breast cancer report chemotherapy-related cognitive changes (CRCC) during treatment, including decreased memory, attention, and processing speed. Though CRCC negatively impacts everyday functioning and reduces overall quality of life in women diagnosed with breast cancer, effective interventions to prevent and/or manage CRCC are elusive. Consequently, women seldom receive advice on how to prevent or manage CRCC. Aerobic exercise is associated with improved cognitive functioning in healthy older adults and adults with cognitive impairments. Accordingly, it holds promise as an intervention to prevent and/or manage CRCC. However, evidence from randomized controlled trials (RCTs) supporting a beneficial effect of aerobic exercise on CRCC is limited. The primary aim of the ACTIVATE trial is to evaluate the impact of supervised aerobic exercise on CRCC in women receiving chemotherapy for breast cancer. METHODS: The ACTIVATE trial is a two-arm, two-centre RCT. Women diagnosed with stage I-III breast cancer and awaiting neo-adjuvant or adjuvant chemotherapy are recruited from hospitals in Ottawa (Ontario) and Vancouver (British Columbia), Canada. Recruits are randomized to the intervention group (aerobic exercise during chemotherapy) or the wait-list control group (usual care during chemotherapy and aerobic exercise post-chemotherapy). The primary outcome is cognitive functioning as measured by a composite cognitive summary score (COGSUM) of several neuropsychological tests. Secondary outcomes are self-reported cognitive functioning, quality of life, and brain structure and functioning (measured by magnetic resonance imaging (MRI)/functional MRI and electroencephalography). Assessments take place pre-chemotherapy (pre-intervention), mid-way through chemotherapy (mid-intervention/mid-wait period), end of chemotherapy (post-intervention/post-wait period; primary endpoint), 16-weeks post-chemotherapy, and at 1-year post-baseline. DISCUSSION: Aerobic exercise is a promising intervention for preventing and/or managing CRCC and enhancing quality of life among women diagnosed with breast cancer. The ACTIVATE trial tests several novel hypotheses, including that aerobic exercise can prevent and/or mitigate CRCC and that this effect is mediated by the timing of intervention delivery (i.e., during versus post-chemotherapy). Findings may support prescribing exercise during (or post-) chemotherapy for breast cancer and elucidate the potential role of aerobic exercise as a management strategy for CRCC in women with early-stage breast cancer. TRIAL REGISTRATION: The trial was registered with the ClinicalTrials.gov database ( NCT03277898 ) on September 11, 2017.

What Motivates Nurses to Exercise? Determinants of Physical Activity Among Canadian Nurses Using Self-Determination Theory.

BACKGROUND: Nurses' suboptimal physical activity (PA) levels place them at high risk for cardiovascular diseases. Little is known about the motivational factors that influence their PA behavior. PURPOSE: This study drew on the Self-Determination Theory (SDT) to investigate whether associations between nurses' levels of mood disturbance, psychological need satisfaction (competence, autonomy, and relatedness), and self-determined motivation predict levels of objectively assessed PA. METHODS: A total of 363 nurses recruited from 14 hospitals in the Champlain region of Ontario, Canada, wore ActiGraph GT3X accelerometers and completed standardized questionnaires assessing sociodemographic and work characteristics, mood disturbance, and SDT variables. Levels of moderate-to-vigorous intensity PA (MVPA) were measured in minutes/week in bouts ≥10 min. Data were analyzed using path analysis and multiple mediational model. RESULTS: The model predicting MVPA showed good fit to the data, χ 2 (4, n = 363) = 7.82, p = .10; comparative fit index = .991; Tucker-Lewis Index = .967; root mean square error of approximation = .051. Higher mood disturbance was associated with lower perceived competence (ß = -.29, p = .002), autonomy (ß = -.29, p = .002), and relatedness (ß = -.19, p = .002). Lower perceived competence (ß = .46, p = .003) and autonomy (ß = .14, p = .011), as well as higher mood disturbance (ß = -.16, p = .016), were associated with less self-determined motivation for PA. Lower self-determined motivation was associated with lower levels of MVPA among nurses. CONCLUSIONS: Interventions targeting low mood, as well as perceived competence and autonomy in exercise, may promote MVPA among nurses and reduce cardiac risk.

Mechanisms underpinning the association between physical activity and mental health in adolescence: a 6-year study.

BACKGROUND: Physical activity (PA) can promote mental health, but the mechanisms underpinning this association are not well-established. This study examined if perceptions of three basic psychological needs (autonomy, competence, relatedness) and moderate-to-vigorous physical activity (MVPA) mediate the association between number of years participating in PA and mental health in adolescence. METHODS: Participants included 937 children (55% female) age 10-11 at inception of the longitudinal MATCH study, who provided data every 4 months over 6 years. Mediation analyses were used to assess the natural direct effect of number of years of PA participation (cycles 1-15) during late childhood and adolescence on later mental health (cycle 16), measured with the Mental Health Continuum-Short Form (MHC-SF), and the natural indirect effect through each of self-perceived autonomy, competence and relatedness, and self-report MVPA (cycle 15). RESULTS: In single mediator models, indirect effects of autonomy, competence, relatedness and self-report MVPA were statistically significant. In joint mediation models (each of three models including one basic psychological need and MVPA), autonomy, competence and relatedness mediated 71, 27, and 51% of the association respectively; MVPA mediated 27-31% of the association. In the mediation model including all four mediators, relatedness mediated the largest proportion of the association, followed by autonomy and MVPA. CONCLUSION: Results support developing strategies to encourage adolescents to engage and remain involved in PA. This could foster perceptions of autonomy, competence, and relatedness as well as MVPA, which in turn may enhance mental health.

Describing and exploring self-esteem, physical self-perceptions, physical activity and self-efficacy in adolescent and young adult cancer survivors.

OBJECTIVES: (a) Describe levels of physical and global self-esteem and (b) explore the relationships between these types of self-esteem and physical activity (PA) behaviour, self-efficacy for PA and physical self-perceptions among adolescent and young adult (AYA) cancer survivors. METHODS: A total of 87 AYA cancer survivors (Mage  = 32.90 ± 4.38 years), who were on average 2.08 ± 1.37 years post-treatment, participated in this cross-sectional observational study. Descriptive statistics, correlations and hierarchical multivariate linear regression analyses were used to analyse the data. RESULTS: Moderate levels of physical and global self-esteem were reported. Both types of self-esteem were significantly related to physical self-perceptions, but not to PA behaviour nor self-efficacy for PA. Self-efficacy for PA moderated the relationship between physical self-perceptions and physical self-esteem, such that the association between physical self-perceptions and physical self-esteem was of stronger magnitude at higher levels of self-efficacy for PA than at lower levels of self-efficacy for PA. CONCLUSION: This study provides a starting point for describing self-esteem and identifying the circumstances under which self-esteem may be optimised among AYA cancer survivors. Fostering feelings of confidence, competence and control over PA may help to promote psychological well-being among AYA cancer survivors.

Motivation Predicts Change in Nurses' Physical Activity Levels During a Web-Based Worksite Intervention: Results From a Randomized Trial.

BACKGROUND: Low physical activity levels can negatively affect the health of nurses. Given the low physical activity levels reported by nurses, there is a clear need for brief and economical interventions designed to increase physical activity levels in this population. We developed a web-based intervention that used motivational strategies to increase nurses' physical activity levels. The intervention provided the nurses with feedback from an activity monitor coupled with a web-based individual, friend, or team physical activity challenge. OBJECTIVE: In this parallel-group randomized trial, we examine whether nurses' motivation at baseline predicted changes in objectively measured physical activity levels during the 6-week intervention. METHODS: The participants were 76 nurses (n=74, 97% female; mean age 46, SD 11 years) randomly assigned to 1 of 3 physical activity challenge conditions: (1) individual, (2) friend, or (3) team. The nurses completed a web-based questionnaire designed to assess motivational regulations for physical activity levels before the intervention and wore a Tractivity activity monitor before and during the 6-week intervention. We analyzed data using multilevel modeling for repeated measures. RESULTS: The nurses' physical activity levels increased (linear estimate=10.30, SE 3.15; P=.001), but the rate of change decreased over time (quadratic estimate=-2.06, SE 0.52; P<.001). External and identified regulations (ß=-2.08 to 11.55; P=.02 to .04), but not intrinsic and introjected regulations (ß=-.91 to 6.29; P=.06 to .36), predicted changes in the nurses' physical activity levels. CONCLUSIONS: Our findings provide evidence that an intervention that incorporates self-monitoring and physical activity challenges can be generally effective in increasing nurses' physical activity levels in the short term. They also suggest that drawing solely on organismic integration theory to predict changes in physical activity levels among the nurses participating in web-based worksite interventions may have been insufficient. Future research should examine additional personal (eg, self-efficacy) and occupational factors (eg, shift length and shift type) that influence physical activity levels to identify potential targets for intervention among nurses. TRIAL REGISTRATION: ClinicalTrials.gov NCT04524572; https://clinicaltrials.gov/ct2/show/NCT04524572.