Pumping iron in Australia: Prevalence, trends and sociodemographic correlates of muscle strengthening activity participation from a national sample of 195,926 adults

OBJECTIVE:The current Australian Physical Activity Guidelines recommend that adults engage in regular muscle-strengthening activity (e.g. strength or resistance training). However, public health surveillance studies describing the patterns and trends of population-level muscle-strengthening activity participation are sparse. The aim of this study is to examine the prevalence, trends and sociodemographic correlates of muscle-strengthening activity participation in a national-representative sample of Australians aged 15 years and over. METHODS:Between 2001 and 2010, quarterly cross-sectional national telephone surveys were conducted as part of the Australian Sports Commission's 'Exercise, Recreation and Sport Survey'. Pooled population-weighted proportions were calculated for reporting: [i] no muscle-strengthening activity; [ii] insufficient muscle-strengthening activity, and [iii] sufficient muscle-strengthening activity. Associations with sociodemographic variables were assessed using multiple logistic regression analyses. RESULTS:Out of 195,926 participants, aged 15-98 years, only 10.4% (95% CI: 10.1-10.7) and 9.3% (95% CI: 9.1-9.5) met the muscle-strengthening activity recommendations in the past two weeks and in the past year, respectively. Older adults (50+ years), and those living in socioeconomically disadvantaged, outer regional/remote areas and with lower education were less likely to report sufficient muscle-strengthening activity (p<0.001). Over the 10-year monitoring period, there was a significant increase in the prevalence of sufficient muscle-strengthening activity (6.4% to 12.0%, p-value for linear trend <0.001). CONCLUSIONS:A vast majority of Australian adults did not engage in sufficient muscle-strengthening activity. There is a need for public health strategies to support participation in muscle-strengthening activity in this population. Such strategies should target older and lower educated adults, and those living in socioeconomically disadvantaged, outer regional/remote and areas

Acute low-volume high-intensity interval exercise and continuous moderate-intensity exercise elicit a similar improvement in 24-h glycemic control in overweight and obese adults

Background: Acute exercise reduces postprandial oxidative stress and glycemia; however, the effects of exercise intensity are unclear. We investigated the effect of acute low-volume high-intensity interval-exercise (LV-HIIE) and continuous moderate-intensity exercise (CMIE) on glycemic control and oxidative stress in overweight and obese, inactive adults.Methods: Twenty-seven adults were randomly allocated to perform a single session of LV-HIIE (9 females, 5 males; age: 30 &plusmn; 1 years; BMI: 29 &plusmn; 1 kg&middot;m&minus;2; mean &plusmn; SEM) or CMIE (8 females, 5 males; age: 30 &plusmn; 2.0; BMI: 30 &plusmn; 2.0) 1 h after consumption of a standard breakfast. Plasma redox status, glucose and insulin were measured. Continuous glucose monitoring (CGM) was conducted during the 24-h period before (rest day) and after exercise (exercise day).Results: Plasma thiobarbituric acid reactive substances (TBARS; 29 &plusmn;13%, p &lt; 0.01; mean percent change &plusmn;90% confidence limit), hydrogen peroxide (44 &plusmn; 16%, p &lt; 0.01), catalase activity (50 &plusmn; 16%, p &lt; 0.01), and superoxide dismutase activity (21 &plusmn; 6%, p &lt; 0.01) significantly increased 1 h after breakfast (prior to exercise) compared to baseline. Exercise significantly decreased postprandial glycaemia in whole blood (&minus;6 &plusmn; 5%, p &lt; 0.01), irrespective of the exercise protocol. Only CMIE significantly decreased postprandial TBARS (CMIE: &minus;33 &plusmn; 8%, p &lt; 0.01; LV-HIIE: 11 &plusmn; 22%, p = 0.34) and hydrogen peroxide (CMIE: &minus;25 &plusmn; 15%, p = 0.04; LV-HIIE: 7 &plusmn; 26%; p = 0.37). Acute exercise provided a similar significant improvement in 24-h average glucose levels (&minus;5 &plusmn; 2%, p &lt; 0.01), hyperglycemic excursions (&minus;37 &plusmn; 60%, p &lt; 0.01), peak glucose concentrations (&minus;8 &plusmn; 4%, p &lt; 0.01), and the 2-h postprandial glucose response to dinner (&minus;9 &plusmn; 4%, p &lt; 0.01), irrespective of the exercise protocol.Conclusion: Despite elevated postprandial oxidative stress compared to CMIE, LV-HIIE is an equally effective exercise mode for improving 24-h glycemic control in overweight and obese adults

Physical activity and mental health in women with polycystic ovary syndrome.

Physical activity is prescribed as a component of primary management for Polycystic Ovary Syndrome (PCOS). This study investigates the association between physical activity and mental health as well as the exercise barriers, motivators and support providers for younger women with and without PCOS to assist in physical activity uptake and prescription for these women

The influence of implicit cognitive processes on physical activity: how the theory of planned behaviour and self-determination theory can provide a platform for our understanding

The influence of implicit cognitive processes on social behaviour has been heavily scrutinised in recent years. A burgeoning body of literature now indicates that implicit processes are particularly predictive of those behaviours that are spontaneously performed and difficult to control. Although interest in implicit cognition has been strong in many fields, few studies have investigated the role of implicit cognitive processes on physical activity. In this article we highlight the avenues through which implicit processes might influence different forms of activity. Two of the most prominent theories in sport and exercise psychology – the theory of planned behaviour and self-determination theory – are used as templates through which discussion is focused. Studies on implicit processes that have utilised these theories are reviewed and critiqued, and the implications of findings from these studies on the prediction of physical activity are discussed. The final section includes a discussion of recent theorising on the mechanisms through which implicit cognitive processes might change. It is hoped that discussion of these important issues will stimulate research into the role of implicit cognitive processes in physical activity

The impact of automatically activated motivation on exercise related outcomes

This study examined the effect of motivational primes on participants (N = 171) during a cycling task. Relative to participants primed with a controlled motivational orientation, it was hypothesized that participants primed for autonomous motivation would report greater feelings of enjoyment, effort, and choice in relation to the cycling activity and report greater exercise intentions. Members of the autonomous prime group were expected to exercise for longer, at a greater percentage of their heart rate maximum, and report lower levels of perceived exertion than those in the controlled prime condition. It was found that, relative to participants in the controlled prime group, those who received the autonomous prime enjoyed the exercise more, exercised at a greater percentage of heart rate maximum, and reported a lower rating of perceived exertion. Furthermore, participants experiencing the controlled prime exercised for less time and had lower intentions to exercise than did other participants. Results highlight the importance of automatic processes in activating motivation for exercise

The role of implicit and explicit components of exerciser self-schema in the prediction of exercise behaviour

This study investigated implicit and explicit components of exerciser self-schema and their role in the prediction of exercise behaviour. In addition, the effect of implicit and explicit exerciser self-schema on intention to exercise was examined. Moderation and mediation effects involving exerciser self-schema, in both its implicit and explicit forms, were investigated

Variations in area-level disadvantage of Australian registered fitness trainers usual training locations

BACKGROUND: Leisure-time physical activity and strength training participation levels are low and socioeconomically distributed. Fitness trainers (e.g. gym/group instructors) may have a role in increasing these participation levels. However, it is not known whether the training location and characteristics of Australian fitness trainers vary between areas that differ in socioeconomic status. METHODS: In 2014, a sample of 1,189 Australian trainers completed an online survey with questions about personal and fitness industry-related characteristics (e.g. qualifications, setting, and experience) and postcode of their usual training location. The Australian Bureau of Statistics 'Index of Relative Socioeconomic Disadvantage' (IRSD) was matched to training location and used to assess where fitness professionals trained and whether their experience, qualification level and delivery methods differed by area-level disadvantage. Linear regression analysis was used to examine the relationship between IRSD score and selected characteristics adjusting for covariates (e.g. sex, age). RESULTS: Overall, 47 % of respondents worked in areas within the three least-disadvantaged deciles. In contrast, only 14.8 % worked in the three most-disadvantaged deciles. In adjusted regression models, fitness industry qualification was positively associated with a higher IRSD score (i.e. working in the least-disadvantaged areas) (Cert III: ref; Cert IV β:13.44 [95 % CI 3.86-23.02]; Diploma β:15.77 [95 % CI: 2.17-29.37]; Undergraduate β:23.14 [95 % CI: 9.41-36.86]). CONCLUSIONS: Fewer Australian fitness trainers work in areas with high levels of socioeconomic disadvantaged areas than in areas with low levels of disadvantage. A higher level of fitness industry qualifications was associated with working in areas with lower levels of disadvantage. Future research should explore the effectiveness of providing incentives that encourage more fitness trainers and those with higher qualifications to work in more socioeconomically disadvantaged areas.status: publishe

The relationship between body image, physical activity, perceived health, and behavioural regulation among Year 7 and Year 11 girls from metropolitan and rural Australia

This study examined the relationship between educational year level, regional differences in adolescent girls' body image perceptions, body mass index (BMI), physical activity (PA) level, self-reported health, and dietary behaviour. Also, the role of PA behavioural regulation on body image was examined. The sample (N=732; Year 7 aged 12.23 years and Year 11 aged 16.18 years) included girls in Year 7 (n=489) and in Year 11 (n=243), recruited from 17 metropolitan and 14 rural schools in Victoria, Australia. Girls completed a self-report questionnaire. Novel outcomes from this study revealed year level and region differences in girls' body image perceptions, BMI, and health behaviours. Body dissatisfaction was associated with poorer perceived health, and health behaviours, such as low PA levels and dieting and external PA motivational orientation. Interventions are needed to promote positive body image and intrinsic motivation for PA to increase PA levels among adolescent girls living in metropolitan and rural regions of Australia