Abstract
Background:
To systematically review the effects of interventions to improve exercise behaviour in sedentary people living with and beyond cancer.
Methods:
Only randomised controlled trials (RCTs) that compared an exercise intervention to a usual care comparison in sedentary people with a homogeneous primary cancer diagnosis, over the age of 18 years were eligible. The following electronic databases were searched: Cochrane Central Register of Controlled Trials MEDLINE; EMBASE; AMED; CINAHL; PsycINFO; SportDiscus; PEDro from inception to August 2012.
Results:
Fourteen trials were included in this review, involving a total of 648 participants. Just six trials incorporated prescriptions that would meet current recommendations for aerobic exercise. However, none of the trials included in this review reported intervention adherence of 75% or more for a set prescription that would meet current aerobic exercise guidelines. Despite uncertainty around adherence in many of the included trials, the interventions caused improvements in aerobic exercise tolerance at 8–12 weeks (SMD=0.73, 95% CI=0.51–0.95) in intervention participants compared with controls. At 6 months, aerobic exercise tolerance is also improved (SMD=0.70, 95% CI=0.45–0.94), although four of the five trials had a high risk of bias; hence, caution is warranted in its interpretation.
Conclusion:
Expecting the majority of sedentary survivors to achieve the current exercise guidelines is likely to be unrealistic. As with all well-designed exercise programmes, prescriptions should be designed around individual capabilities and frequency, duration and intensity or sets, repetitions, intensity of resistance training should be generated on this basis.
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Main
It is estimated that there are now around 29 million people living with or beyond cancer globally (excl. non-melanoma skin cancer) (GLOBOCAN, 2008), and this number will continue to rise as a result of an ageing population, increased detection and improving survival (Maddams et al, 2009). For many cancer survivors, iatrogenic harm caused by primary treatment, and the transition from end of treatment to living beyond cancer, can have an impact on all aspects of life for the individuals and their families (Ferrell et al, 1998).
Europe’s largest survey assessing patient-reported outcomes in people living with and beyond cancer reported that <25% meet the current physical activity guidelines, 43% have trouble with fatigue and 45% experience fear of disease recurrence (Department of Health—Quality Health, 2012). Furthermore, around 50% of people with cancer have an existing chronic condition (Elliott et al, 2011) and are at an increased risk of develo** new comorbidities such as heart failure, coronary heart disease, osteoporosis and diabetes during the survivorship period (Khan et al, 2011). For these individuals, the proportion suffering on-going poor health, quality of life and disability may be as high as 25–30% (Elliott et al, 2011).
Exercise interventions for cancer survivors have received increasing attention over the last decade as an effective way to improve health-related quality of life, physical function and reduce fatigue (Fong et al, 2012; Mishra et al, 2012a, 2012b). Associations with the reduced risk of disease recurrence have also come to prominence (Holmes et al, 2005; Meyerhardt et al, 2006, 2009; Kenfield et al, 2011; Richman et al, 2011). The current exercise guidelines indicate that cancer survivors should achieve 150 min per week of aerobic exercise and twice weekly resistance (strength) training (Rock et al, 2012). However, as few individuals achieve such physical activity levels, a comprehensive review of behaviour-change effectiveness including which interventions meet the current guidelines is crucial. The aim of this study was to systematically review the effects of exercise interventions on exercise behaviour in sedentary people living with and beyond cancer.
Materials and Methods
Search strategy
Full details of the MEDLINE search (which was adapted accordingly for separate databases) can be seen in the parallel publication of Bourke et al (2013). Briefly, the following electronic databases were searched: Cochrane Central Register of Controlled Trials MEDLINE; EMBASE; AMED; CINAHL; PsycINFO; SportDiscus; PEDro from inception to August 2012. To supplement this evidence, grey literature was evaluated, leading experts in the field and charities were written to and reference lists of other recent systematic reviews were screened for potential trials.
Eligible studies
Only randomised controlled trials (RCTs) involving adults (18 years or over) that aimed to improve exercise behaviour compared with a usual care comparison group with a sedentary lifestyle (i.e., not undertaking 30 min or more of the structured exercise of at least a moderate intensity, 3 days per week) were included. Participants were required to have been histologically or clinically diagnosed with cancer regardless of sex, tumour site, tumour type, tumour stage and type of anticancer treatment received. Only interventions that detailed the frequency, duration and intensity of aerobic exercise behaviour, or the frequency, intensity, type, sets, repetitions of resistance exercise behaviour were included. The exercise programmes could be individual or group, professionally led or not, and home, community, primary care or exercise facility based. Eligible RCTs must have included at least 6 weeks of follow-up.
In an effort to attempt to understand how different interventions might be relevant to each type of cancer and its specific treatment methods, we did not include studies of heterogeneous cancer cohorts (i.e., patients with different primary cancer sites). Studies in ‘at risk’ populations that are addressing primary prevention research questions were not included. Trials directed specifically at end-of-life-care pathways or hospital in-patients were also excluded.
Study quality
Risk of bias and methodological quality were assessed in accordance with the Cochrane Collaboration’s tool for assessing risk of bias (Higgins and Green, 2011). Two review authors (LB and KH) applied the risk of bias tool independently, and any differences were resolved by discussion with a third review author (ST or DR).
Outcomes
Primary outcomes were aerobic exercise behaviour (frequency, duration and intensity) and resistance exercise behaviour (sets, repetitions and intensity). Interventions were judged as successful in achieving their exercise goals as identified in the study methods if they reported at least 75% adherence over the given follow-up period (Martin and Sinden, 2001). We also assessed which interventions were designed to achieve the American Cancer Society’s guidelines for exercise in people living with and beyond cancer – that is aerobic exercise of at least 150 min per week – with at least 2 days per week of strength training (Rock et al, 2012). Secondary outcomes were change in aerobic fitness or exercise tolerance, change in skeletal muscle strength and endurance, adverse events and intervention attrition rate.
Screening and data extraction
All titles and abstracts were screened to identify studies that might meet the inclusion criteria or that could not safely be excluded without full-text assessment (e.g., where there is no abstract available) by two of the authors working independently (LB and KH). Full texts were retrieved for these articles. All eligible papers were formally abstracted by at least two members of the group working independently (LB and KH) using the data collection form and the risk of bias tool (Higgins and Green, 2011). Any disagreements were resolved by discussion with one more review author (ST or DJR).
Data synthesis
Data on adherence were quantified in terms of number of prescribed exercise sessions attended as a proportion of those prescribed. Interventions were categorised in terms of the behaviour-change techniques (BCTs) used according to the ‘Coventry, Aberdeen & London—Refined’ (CALO-RE) taxonomy by a health psychologist trained in using this taxonomy (LS) and checked by LB (Michie et al, 2011). Where possible, and if appropriate, meta-analyses of review outcomes were performed. A fixed-effect model was used if there was no significant statistical heterogeneity (I2⩾50%). For continuous outcomes (e.g., fitness or exercise tolerance), the standardised mean difference between treatment arms was estimated by extracting the final value and standard deviation of the outcome of interest with the number of participants assessed at follow-up. The Cochrane group RevMan version 5.2 statistical analysis software was used to carry out meta-analyses (Cochrane IMS, 2013).
Results
We identified 5559 unique records from research database records from grey literature and ‘snowballing’ techniques, which included reference checking from recent large systematic reviews (see Figure 1, PRISMA flow chart). Given that the detail of prescribed exercise is rarely reported in manuscript abstracts (e.g., frequency, intensity and duration of exercise prescription), this led to a large number of manuscripts being evaluated at the full-text stage (n=402). After consensus agreement between study authors, 14 RCTs were included in this review (McKenzie and Kalda, 2003; Pinto et al, 2003, 2005, 2013; Drouin et al, 2005; Kim et al, 2006; Daley et al, 2007; Cadmus et al, 2009; Hayes et al, 2009; Perna et al, 2010; Kaltsatou et al, 2011; Bourke et al, 2011a, 2011b; Musanti, 2012). A total of 648 participants were randomised in these trials. A total of 377 reports were excluded; reasons for exclusion were: non RCTs – for example, reviews or comment/editorial articles; mixed cancer cohorts or cohorts that included non-cancer populations; trials that failed to describe essential metrics of exercise prescription used in the intervention; trials involving active participants at baseline; trials involving hospital in-patients; interventions that were <6 weeks in follow-up; trials involving participants <18 years of age; not able to translate into English.
The majority of trials were conducted in breast cancer survivors with only two trials in colorectal (Bourke et al, 2011b; Pinto et al, 2013) and one trial in prostate cancer (Bourke et al, 2011a). A summary of study characteristics can be seen in Table 1. We only found one study that reported data from patients with metastatic disease (Bourke et al, 2011a) and two studies that were conducted in obese cohorts (Drouin et al, 2005; Cadmus et al, 2009). The overwhelming proportions of participants were White, with only one study reporting data from an ethnically diverse sample (Perna et al, 2010). Comorbidities at baseline were largely unclear or unreported, with only two studies (Daley et al, 2007; Hayes et al, 2009) reporting on proportion with lymphedema, and one trial reporting on proportion with clinically relevant depression scores (Perna et al, 2010).
Seven trials used a combination of supervised and non-supervised exercises (Pinto et al, 2003; Kim et al, 2006; Cadmus et al, 2009; Hayes et al, 2009; Perna et al, 2010; Bourke et al, 2011a, 2011b); four trials were exclusively home-based (Drouin et al, 2005; Pinto et al, 2005, 2013; Musanti, 2012); and just three were exclusively supervised trials (McKenzie and Kalda, 2003; Daley et al, 2007; Kaltsatou et al, 2011). Contact with exercise professionals or study researchers ranged from 20 times over 12 weeks (Hayes et al, 2009) to weekly phone calls after an initial one-to-one exercise consultation (Pinto et al, 2005, 2013). Just six trials incorporated prescriptions that would meet the Rock et al (2012) recommendations for aerobic exercise, that is, 150 min per week (Cadmus et al, 2009; Pinto et al, 2013) or resistance exercise, that is, strength training exercises at least 2 days per week (Perna et al, 2010; Bourke et al, 2011a, 2011b; Musanti, 2012). Only three trials were identified that attempted to objectively validate independent exercise behaviour with accelerometers or heart rate monitoring (Pinto et al, 2005, 2013; Cadmus et al, 2009). A summary of included studies can be seen in Table 2.
Quality of studies
Three trials were judged not to include a high risk of bias (Drouin et al, 2005; Cadmus et al, 2009; Bourke et al, 2011b). The majority of uncertainty in judging trial bias came from a lack of clarity around randomisation procedures and blinding of study outcome assessors (McKenzie and Kalda, 2003; Pinto et al, 2003, 2005, 2013; Kaltsatou et al, 2011). The majority of trials in the review were judged to include at least one element indicating a high risk of non-standard bias. These included adherence data missing or not clear (McKenzie and Kalda, 2003; Hayes et al, 2009; Kaltsatou et al, 2011; Musanti, 2012); high attrition at follow-up (Pinto et al, 2003; Bourke et al, 2011a); significant differences in those participants excluded from trial analysis/dropouts (Pinto et al, 2003; Kim et al, 2006; Musanti, 2012); numbers randomised to trial arms and trial completion rate are unclear (Perna et al, 2010); significant differences in cohorts at baseline (Pinto et al, 2003, 2005; Musanti, 2012); inconsistencies between objective and subjective measures of exercise behaviour (Pinto et al, 2005, 2013).
Effects of the interventions
None of the trials included in this review reported an adherence of 75% or more, to a prescription that would meet the Rock et al (2012) aerobic exercise guidelines. Only three trials reported an adherence of 75% or more to a lower aerobic exercise goal (Cadmus et al, 2009; Bourke et al, 2011a, 2011b). Notably, all three incorporated both a supervised and independent exercise component as part of their intervention and none placed restrictions on the control group in terms of their exercise behaviour. Cadmus et al (2009) appeared to be the most successful study regarding the promotion of aerobic exercise behaviour, with 75% of the intervention group reporting between 90 and 119 min per week of moderate intensity exercise, at an average heart rate of 76% of predicted maximum, for 6 months. However, of these three trials, only two (Bourke et al, 2011a, 2011b) met the Rock et al (2012) exercise guidelines: specifically, two to four sets of resistance exercise at 60% of one rep maximum, for eight to 12 reps, was carried out twice per week, for just 6 weeks. These three trials shared the following BCTs: goal setting, self-monitoring of behaviour and prompting practice, which were common to most of the interventions, included in the review; however, additionally these three studies included generalisation of a target behaviour – that is, getting people to engage in exercise outside of the immediate intervention environment.
These trials did not explicitly state a theoretical basis. Other studies such as Daley et al (2007) or Perna et al (2010) were much more comprehensive in their reporting of BCTs and were based on recognised behaviour-change theory. Full details of intervention coding according to the CALO-RE taxonomy (Michie et al, 2011) of exercise BCTs can be seen in Table 3. Several trials might have achieved an adherence of 75% or more; however, because of unclear reporting it was not possible to make a judgement on whether this criterion had been fulfilled.
A meta-analysis of change in aerobic exercise tolerance was carried out on seven trials that reported these outcomes. Aerobic exercise tolerance was significantly better after 8–12 weeks of follow-up in intervention vs control in 330 participants (SMD=0.73, 95% CI=0.51–0.95) and at 6 months of follow-up in intervention vs control in 271 participants (SMD=0.70, 95% CI=0.45, 0.94; see Figure 2). The 6-month data should be viewed with caution as four of the five trials were judged to have a high risk of bias. Limb strength was significantly better in intervention vs controls in 91 participants (SMD=0.51, 95% CI=0.09–0.93). After removing one trial for a high risk of bias (Musanti, 2012), in 68 participants the moderate effect size was still apparent but was no longer significant (SMD=0.47, 95% CI=−0.01, 0.96).
Attrition rates during the intervention from the included trials ranged from 25% (Pinto et al, 2003) to 0% (Drouin et al, 2005) (median 6%), with five trials not clearly reporting attrition in the intervention arm. Eight trials reported adverse events that ranged from minor – for example, muscular–skeletal problems (Musanti, 2012) to major events – for example, death (Kim et al, 2006). However, only one study was explicit as to which of these adverse events were caused by participating in the intervention group (two instances of plantar fasciitis; Cadmus et al, 2009).
Discussion
The review findings indicate that currently there is a lack of convincing evidence to suggest that existing exercise interventions are useful for achieving the Rock et al (2012) guidelines of 150 min per week of aerobic exercise and twice per week of resistance exercise, in sedentary cancer cohorts. Adherence to exercise interventions, which is crucial for understanding treatment dose, is frequently poorly reported. Importantly, the fundamental metrics of exercise behaviour, that is, frequency, intensity and duration, or repetitions, sets and intensity of resistance training, although easy to devise and report, are seldom included in published clinical trials. Attempting to reproduce any exercise prescription without detailing these metrics is fraught with problems, and most likely not possible. The extent of exclusion at the full-text screening stage (377 publications excluded from 402) provided the first indication of problems associated with quality of reporting in this research field.
The supportive evidence that we have narratively synthesised suggests that interventions that combine the supervision of exercise training in tandem with a requirement of independent exercise are likely to promote better adherence. Use of generalisation of behaviour was also a common and relatively unique feature of interventions, which reported better adherence.
Despite the uncertainty around adherence in many of the included trials, the interventions caused improvements in aerobic exercise tolerance at 8–12 weeks and 6 months of follow-up.
Such improvements could be interpreted as reassuring: some of the doubts around adherence might only extend to reporting issues rather than real problems with fidelity. Alternatively, this result could have arisen from the rapid, relatively large early gains in function expected in sedentary participants from exercise training, which could mask smaller changes in non-adherers. Further, aerobic exercise tolerance should not be considered as definitive evidence of changes in aerobic fitness (with the accompanying spectrum of underlying physiological adaptation). It could simply reflect individuals becoming accustomed to the feeling of exertion from exercise testing and a better tolerance towards perceptions of fatigue.
To the authors’ knowledge, this is the first comprehensive review to evaluate RCTs with respect to their success in improving exercise behaviour in sedentary cancer cohorts against state of the art recommendations for these patients. The large majority of these trials included women with breast cancer, the remaining three were in people with prostate and colorectal cancer. Furthermore, the overwhelming majority of participants were White, with only one trial made up of an ethnically diverse population. As such, other ethnicities are substantially under-represented. Thirteen of the 14 included trials were conducted in North America or Western Europe, with one trial from Australia. All were in high-income nations. No evidence was found from low- or middle-income countries, and it is uncertain whether the featured interventions would be deliverable in these parts of the world.
Another recent systematic review that examined predictors of adherence to exercise in people living with and beyond cancer (Husebo et al, 2013) found that the transtheoretical model of behaviour change and the theory of planned behaviour were significantly associated with better exercise adherence. The current review does not explicitly support such conclusions. It should be noted that there are key differences in each review methodology, with the present review only including RCTs and people who were sedentary at baseline. Other recent systematic reviews have focused on the potential health-related outcomes of exercise interventions for people living with and beyond cancer. In this respect, Fong et al (2012) similarly reported improvements in aerobic exercise tolerance and muscle strength. One substantial difference in the methodology of the present review when compared with other Cochrane reviews in the area (Mishra et al, 2012a, 2012b) is that we only included studies where the essential metrics of exercise behaviour are reported.
There are limitations to this review, namely the large majority of these trials included women with breast cancer. One trial involved men with advanced prostate cancer and two trials involved colorectal cancer survivors. Although these three primary cancers make up the majority of the population living with and beyond cancer, other common cancers such as lymphoma and lung cancer do not appear at all in this review. Less common cancers are also not represented in the evidence base. Furthermore, the overwhelming majority of participants were White, with only one trial made up of an ethnically diverse population.
Recently, in the largest survey of cancer survivors (covering multiple cancer types) to be conducted in Europe (N=3300), the UK Department of Health reported that <25% of people living with and beyond cancer are achieving 30 min of exercise on 5 or more days per week. (Department of Health—Quality Health, 2012) This is a clear indicator that the overwhelming majority of cancer survivors are not active. It is therefore of critical importance that future research is designed to improve exercise behaviour in sedentary individuals living with or beyond cancer, particularly in under-represented groups. All trials should report as standard, frequency, intensity and duration of aerobic exercise, as well as reps, sets and intensity of resistance exercise used in intervention prescriptions. Using these essential metrics of exercise prescription will not only help to achieve a balance between safe yet effective exercise but will also ensure that meaningful re-evaluation over time can be undertaken, as adaptation or disease progression dictates.
Reporting of adherence as a single proportion of the cohort who attended/performed exercise according to the set prescription and reporting of BCTs (e.g., using the CALO-RE taxonomy) needs to be standardised. By achieving these standardisations, oncology scientists and clinicians will help to bring the discipline up to the level of acceptable rigour that will help to elucidate dose response of exercise interventions for given health outcomes. This should afford an opportunity to communicate achievable exercise recommendations for sedentary people living with and beyond cancer.
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18 February 2014
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Bourke, L., Homer, K., Thaha, M. et al. Interventions to improve exercise behaviour in sedentary people living with and beyond cancer: a systematic review. Br J Cancer 110, 831–841 (2014). https://doi.org/10.1038/bjc.2013.750
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DOI: https://doi.org/10.1038/bjc.2013.750
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