A scoping review of interventions to improve strength training participation

Resistance Exercise Training in Individuals With and Without Cardiovascular Disease: 2023 Update: A Scientific Statement From the American Heart Association

Resistance training not only can improve or maintain muscle mass and strength, but also has favorable physiological and clinical effects on cardiovascular disease and risk factors. This scientific statement is an update of the previous (2007) American Heart Association scientific statement regarding resistance training and cardiovascular disease. Since 2007, accumulating evidence suggests resistance training is a safe and effective approach for improving cardiovascular health in adults with and without cardiovascular disease. This scientific statement summarizes the benefits of resistance training alone or in combination with aerobic training for improving traditional and nontraditional cardiovascular disease risk factors. We also address the utility of resistance training for promoting cardiovascular health in varied healthy and clinical populations. Because less than one-third of US adults report participating in the recommended 2 days per week of resistance training activities, this scientific statement provides practical strategies for the promotion and prescription of resistance training.

Exercise instructors are not consistently implementing the strength component of the UK chief medical officers' physical activity guidelines in their exercise prescription for older adults

Strength training recommendations have been embedded within the UK's Chief Medical Officers' physical activity guidelines since 2011. There is limited evidence that these recommendations are used by exercise instructors in the community to underpin strength training prescription in the older adult population. This study aimed to explore exercise instructors' awareness and utilisation of the guidelines when prescribing strength training to older adults. Fifteen exercise instructors working with older adults in the UK participated in one online interview. A general inductive approach was conducted and thematic analysis allowed for major themes to be identified from the raw data. We found that most exercise instructors (n = 9), but not all (n = 6), were aware of the guidelines. Only one instructor (n = 1) had reportedly implemented the guidelines into their practice; other instructors reported that the guidelines were irrelevant. Instead, each of the instructors had their preferred sources of information that they relied on to underpin their exercise prescription, and each had their own interpretation of 'evidence-based strength training.' This individualised interpretation resulted in exceptionally varied prescription in the community and does not necessarily align with the progressive, evidence-based prescription known to build muscular strength. We suggest that (i) more detail on how to build muscular strength be embedded within the guidelines, (ii) a handbook on how to implement the guidelines be made available, (iii) theoretical and practical teaching materials and courses be updated, and/or (iv) a re-(education) of exercise instructors already in the field may be necessary to bring about a consistent, evidence-based strength prescription necessary for the best possible health and longevity outcomes for our ageing population.

Differential correlates for aerobic physical activity and resistance training: a systematic review

Worldwide, physical inactivity is a major public health concern. Both aerobic physical activity (PA) and resistance training (RT) are forms of exercise that provide numerous health benefits. The present systematic review aimed to examine the evidence among studies that have formally compared the correlates of both aerobic PA and RT in the same sample. Literature searchers were concluded in April 2022 using four common databases. Eligible studies were selected from English language peer-reviewed journals which reported at least a bivariate correlation between the correlate and aerobic PA and RT. Findings were grouped by the correlate in accordance with the capability, opportunity, motivation, behavior (COM-B) model. The analysis identified 18 studies with 16 independent samples. Overall, evidence suggest that there are many similarities between aerobic PA and RT participation. There were positive associations for both aerobic PA and RT for physical and psychological capabilities, reflective and reflexive motivation. There were mixed associations for environmental opportunities, and social opportunities had no association for aerobic PA but mixed evidence for RT. The analyses emphasized that comparative research is lacking in certain areas, principally for environmental opportunity and reflexive motivation.

A Systematic Review of the Mediators of Resistance Training Behavior

BACKGROUND

Resistance training (RT) has been identified as an important lifestyle activity for health. While systematic reviews have examined behavior change techniques (BCTs) used in interventions and potential correlates of RT behavior, the connection between BCTs and changes in putative mediators and RT participation have yet to be linked. The purpose of this review was to examine RT intervention effects, as coded by BCT clusters, on behavior change via capability, opportunity, and motivation as putative mediators of that change.

METHOD

Literature searches were concluded in January of 2023, using three databases. Eligible studies included a comparison group, assessed RT as an outcome, included BCTs, assessed potential mediators, and were in English. The initial search yielded 1050 hits, which was reduced to 5 to independent RT interventions. Screening of previous reviews yielded three additional papers for a total of 8 papers. Each paper was assessed for the associations between intervention effects (as BCT clusters) on mechanisms of action (a path), effects of mechanisms of action on behavior (b path), and indirect (ab path) and direct (c path) effects of BCT clusters.

RESULTS

There was support that interventions had significant effects on capability and opportunity with inconclusive effects on motivation (a path). Both capabilities and motivation had associations with RT behavior (b path). The examined studies showed that changes in capabilities have the strongest support as a mediator with some support for motivation as a mediator (ab path). Studies that used more BCT clusters seemed to have a more positive effect on behavior, yet there were no trends to suggest any one crucial BCT cluster (c path).

CONCLUSION

Current evidence suggests that capabilities and motivation are important to target in RT interventions. Future interventions would be well suited to utilize behavior change techniques that address these mediators.

Resistance Training Behavior Is Enhanced With Digital Behavior Change Coaching: A Randomized Controlled Trial With Novice Adults

BACKGROUND

Approximately a third of US adults meet the physical activity guidelines of engaging in resistance training 2 times per week, yet few studies have examined how to increase participation rates. The present randomized control trial compared a remotely delivered coaching intervention with an education only control group.

METHODS

Eligible participants completed 2 remotely delivered Zoom-based personal training sessions during a 1-week run-in period. Participants randomized to the intervention group received synchronous weekly behavioral video coaching sessions over Zoom, whereas the control group received no further contact. Days of resistance training completed were assessed at baseline (pre), 4 weeks (post), and 8 weeks (follow-up). Linear mixed models were used to examine group differences at each time point and within-group differences over time.

RESULTS

There were significant between-group differences favoring the intervention, at posttest for both the previous week (b = 0.71, SE = 0.23; P = .002) and the previous 4 weeks (b = 2.54, SE = 0.87; P = .003) but not at the follow-up period for either the last week (b = 0.15, SE = 0.23; P = .520) or the last 4 weeks (b = 0.68, SE = 0.88; P = .443).

CONCLUSION

The present study showed that by providing participants with equipment, skill, and in the case of the intervention group, a remote coaching intervention, resistance training participation increased.

'A Lot of People Just Go for Walks, and Don't Do Anything Else': Older Adults in the UK Are Not Aware of the Strength Component Embedded in the Chief Medical Officers' Physical Activity Guidelines-A Qualitative Study

Strength recommendations have been embedded within the UK's Chief Medical Officers' physical activity guidelines since 2011. In 2019, they were given a more prominent position in the accompanying infographic. However, there is limited evidence that these recommendations have been successful in their population-wide dissemination. This study aimed to explore the engagement of community-dwelling older adults with the guidelines to date and to gain a nuanced understanding of the awareness, knowledge, and action that older adults take to fulfil strength recommendations. A total of fifteen older adults living in the UK participated in one online interview. A general inductive approach was used to generate themes from the data. There were four major themes that were found. 1. The strength component of the physical activity guidelines, 2. Barriers, 3. Motivators, and 4. Solutions. No participants were aware of the strength guidelines. When they were asked what activities they used to fulfil the 'build strength on at least two-days-per-week' criteria, walking, yoga, and Pilates were the most common responses. Ageism and strength training misconceptions were major barriers to participation in strengthening exercise. Older adults were much less aware of the benefits of building strength and strength training participation when compared to aerobic activities, so motivators to participation were generally not specific to strength training. Finally, there are several ways that practitioners can overcome the barriers to strength training participation. Solutions to improving the uptake and adherence to strength training participation are likely to be more successful when they include opportunities for social interaction, ability-appropriate challenge, and provide both short- and long-term benefits.