Relationship between sarcopenia and physical activity in older people: a systematic review and meta-analysis
Received 22 January 2017
Accepted for publication 24 March 2017
Published 17 May 2017 Volume 2017:12 Pages 835—845
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Dr Richard Walker
Michal Steffl,1 Richard W Bohannon,2 Lenka Sontakova,1 James J Tufano,1 Kate Shiells,3 Iva Holmerova3
1Department of Physiology and Biochemistry, Faculty of Physical Education and Sport, Charles University Prague, Prague, Czech Republic; 2Department of Physical Therapy, College of Pharmacy and Health Sciences, Campbell University, Buies Creek, NC, USA; 3Faculty of Humanities, Centre of Gerontology, Charles University Prague, Prague, Czech Republic
Abstract: Physical activity (PA) has been identified as beneficial for many diseases and health disorders, including sarcopenia. The positive influence of PA interventions on sarcopenia has been described previously on many occasions. Current reviews on the topic include studies with varied PA interventions for sarcopenia; nevertheless, no systematic review exploring the effects of PA in general on sarcopenia has been published. The main aim of this study was to explore the relationship between PA and sarcopenia in older people on the basis of cross-sectional and cohort studies. We searched PubMed, Scopus, EBSCOhost, and ScienceDirect for articles addressing the relationship between PA and sarcopenia. Twenty-five articles were ultimately included in the qualitative and quantitative syntheses. A statistically significant association between PA and sarcopenia was documented in most of the studies, as well as the protective role of PA against sarcopenia development. Furthermore, the meta-analysis indicated that PA reduces the odds of acquiring sarcopenia in later life (odds ratio [OR] =0.45; 95% confidence interval [CI] 0.37–0.55). The results of this systematic review and meta-analysis confirm the beneficial influence of PA in general for the prevention of sarcopenia.
Keywords: aging, sarcopenia, physical activity
Although diseases related to the aging process are problematic themselves, they rarely occur in isolation and the effects of one may spark the onset of another. As such ailments progress, the importance of physical activity (PA) remains high, with previous research confirming that regular PA is essential for healthy aging.1 Specifically, PA plays a substantial role in lowering the risk of coronary heart disease,2 obesity,3 type 2 diabetes,4 hypertension,5 peripheral vascular disease,6 high cholesterol,7 osteoporosis,8 osteoarthritis,9 and chronic obstructive pulmonary disease.10 Although PA may have an indirect impact on some health aspects, it has a direct impact on muscle quality and quantity.11
Sarcopenia, which was first described by Rosenberg in 198912 as the progressive decrease in muscle mass and strength during aging, is a syndrome that is directly affected by PA.13–15 Soon after sarcopenia was defined, muscle mass assessment had been recommended as the main sarcopenia diagnosing method. Baumgartner et al16 proposed that the appendicular skeletal muscle mass index (ASMMI) should be the main indicator, and the cutoff point was established as two standard deviations below the mean of a young reference group. Even though this measurement is always expressed in relative terms (muscle mass in kilograms divided by body height in meter squared, resulting in kg/m2), many different names have been suggested, eg, appendicular lean mass index (ALMI), fat-free mass index (FFMI), relative skeletal muscle mass index (RSMI), and muscle mass index (MMI), and occasionally skeletal muscle mass (SMM) alone serves as an indicator of sarcopenia. Computed tomography (CT) and magnetic resonance imaging (MRI) are gold standards for measuring muscle mass in research. The dual-energy X-ray absorptiometry (DXA) is the preferred alternative method for research and clinical use;17 however, bioelectrical impedance analysis (BIA) has been found as a relevant alternative.18 Except these methods, the mid-upper arm muscle circumference (MAMC) has been proposed as an alternative tool for muscle mass estimation.19 Later, several groups were formed for sarcopenia consensus on definition and diagnosis in Europe – the European Working Group on Sarcopenia in Older People (EWGSOP),17 in Asia – the Asian Working Group for Sarcopenia (AWGS),20 and except them the International Working Group on Sarcopenia (IWGS).21 These groups recommended including muscle strength and physical performance measurement as the additional methods for sarcopenia diagnosing. Currently, the EWGSOP algorithm is the most widely used method in research and in clinical practice.
Previous research has shown that physical inactivity contributes to the development of sarcopenia,22,23 and other studies have shown that PA increases muscle strength24,25 and muscle mass26,27 in older adults. Therefore, a strong link has emerged between PA and a lower prevalence of sarcopenia.28–31 Specifically, resistance training is generally considered to be the best countermeasure for preventing sarcopenia.11,32–38
Although many reviews and meta-analyses have summarized the effects of individual or combined interventions (eg, resistance training and nutritional supplementation) on sarcopenia, a systematic review and meta-analysis of the effects of PA defined as general activity that requires more energy than resting metabolic rate (eg, exercising, strengthening, walking, working in the garden, and so on) on sarcopenia has not been published. Therefore, the main aim of this systematic review and meta-analysis was to describe the relationship between PA and the presence of sarcopenia.
This systematic review and meta-analysis, in accordance with the recommendations and criteria as outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement,39 focused on cross-sectional and cohort studies.
Criteria for considering studies for this study
To be included in the analyses, studies had to meet the following conditions: only data from cross-sectional studies and follow-up or baseline datasets of longitudinal cohort studies were included, date of publication 1989–2017, English language, and participants have to be older than 40 years. As PA, there were considered every activity requiring increased energy output without regard of frequency and intensity, sarcopenia has to be diagnosed by some of the standard recommendation. There had to be data presented from regression models, which included PA as the independent variable and sarcopenia as the dependent variable, and odds ratio (OR) had to be used as the effect size in those regression models for the systematic review. For the meta-analysis, the raw data reporting numerically PA habits by both sarcopenic and nonsarcopenic individuals had to be presented.
Search methods for identification of studies
Appropriate articles were manually identified through searches using four electronic databases: PubMed, Scopus, EBSCOhost, and ScienceDirect and through the reference lists of publications identified in this search. The search stream that was used in all the databases is presented in Table 1. This process was conducted by the first and third authors; the searches were done by the first and last authors independently. There was no disagreement between those coauthors during the process. The articles were collected and sorted using the software EndNote X5 for managing bibliographies.
Table 1 Search strategies used with four databases to identify articles describing the relationship between sarcopenia and physical activities
Data collection and analysis
All abstracts were explored by the first and third authors independently with the aim of identifying relevant articles. During the first step of this process, duplicate articles and reviews were removed, then full texts of the remaining articles were systematically examined for inclusion or exclusion, and the articles lacking the required information about PA and sarcopenia were removed. Subsequently, the remaining articles were included in the synthesis. Additionally, the aforementioned protocol was completed on relevant articles that were identified within the reference lists of the articles identified through database searching. After collection of the relevant articles, the Newcastle-Ottawa Scale (NOS) was used to assess the quality of nonrandomized studies in meta-analyses to eliminate the risk of bias.40 This was carried out independently by the fourth and fifth authors. There was no disagreement between them during the process.
Measures of effect sizes
The Cochran-Mantel-Haenszel statistical method41 based on a fixed-effect model was used to calculate an effect size of PA on sarcopenia in the meta-analysis. The OR was calculated as the effect size of PA on sarcopenia. In this article, the OR estimated the odds of demonstrating sarcopenia while accounting for PA. An OR less than 1 favors PA, indicating that PA decreases the risk (odds) of sarcopenia, and an OR greater than 1 suggests that PA increases the risk (odds) of sarcopenia. A sensitivity analysis was carried out to reach the best estimation. During the sensitivity analysis, those studies that might have had an influence on heterogeneity because of publication bias were removed. Through the sensitivity analysis, the best OR estimation represented by the highest value of a test for the overall effect (Z) taking into account heterogeneity and publication bias was calculated. An index I2, which does not depend upon the number of studies, the type of outcome data, or the choice of treatment effect, was used to quantify the impact of heterogeneity and to assess inconsistency. I2 can be readily calculated from basic results obtained from a typical meta-analysis as I2=100% × (Q − df)/Q, where Q is standard Cochran’s heterogeneity statistic and df the degrees of freedom. A rough guide to interpretation of I2 is as follows: 0 to 40% might not be important, 30% to 60% may represent moderate heterogeneity, 50% to 90% may represent substantial heterogeneity, and 75% to 100% represents considerable heterogeneity.42 Funnel plots were used for visualizing biases.43 A funnel plot is a simple scatter plot of exposing the effect estimated from individual studies against some measures of each study’s size or precision.44 Statistics were carried out using Review Manager 5.3.
Description of studies and study population
Figure 1 summarizes the yield of the search process. Of 354 articles identified as potentially relevant by the database searching, 19 were included. An additional six articles identified through article reference lists were added. Excluded articles are presented in Table S1. Ultimately, 25 total studies were included in the qualitative and quantitative syntheses, comprised of 17 cross-sectional30,31,45–59 and 8 cohort studies.29,60–66 From these 25 articles, 20 were used in the systematic review and 14 were used in the meta-analysis: some articles were used for both, but all 25 articles were used in one way or another. Data from 40,007 individuals (21,222 males and 18,785 females) were obtained from all 25 studies. The mean age of the participants was 71.7±4.9 for nonsarcopenic males and 74.9±5.6 for sarcopenic males and 73.1±4.7 for nonsarcopenic females and 76.1±5.0 for sarcopenic females. All participants were over 60 years old apart from subjects within four studies: Beavers et al (>40 years old),45 de Castro et al (55–68 years old),46 Castillo et al (55–98 years old),62 and Park et al (>50 years old).55 The age ranged from 40 to 106 years. Participants lived in a community in 23 cases, one time in a nursing home,50 and one time participants were recruited from a hospital.53 PA was quantified using several different methods, but the most common was a self-report questionnaire. In most studies, PA was divided into several categories. Sarcopenia diagnostics were based on body composition measurements in most cases. The EWGSOP algorithm was used in seven studies, and AWGS criteria and IWGS criteria were each used one time (Table 2). The quality of the included studies was sufficient according to the NOS score, and no study was excluded due to that analysis (Table S2).
Figure 1 Flowchart showing how the reviewed articles were identified and selected.
Most of the regression models suggested that PA might help preserve muscle mass because only four of 32 ORs were above 1, and only one study49 estimated PA to be a significant risk factor for sarcopenia in females. However, 13 of 32 regression models estimated PA to be a significant protective factor against sarcopenia in older people (Table 3). Additionally, six of nine regression models estimated that physical inactivity was a significant risk factor for sarcopenia in older people (Table 4).
Table 4 Relationship between sarcopenia and physical inactivity, according to multiple regression models
In all the analyses, the article by Goodman et al49 stand out of the funnel plot that signalized the increased risk of bias and for the same reason the article by Park et al55 was excluded during sensitivity analysis in the analysis males and females together.
For males, data from eight studies were initially included in the first analysis, with one study49 later excluded due to publication bias, thereby resulting in acceptable heterogeneity, from I2=73% to I2=4%. After the exclusion of this study, the OR (95% confidence interval [CI]) for males (n=3,881) was 0.46 (0.37–0.58), Cochran Q =5.2, df=5 (P=0.390), indicating that PA reduced the odds of males suffering from sarcopenia. The test for overall effect was quite strong Z=6.50, which was statistically significant (P<0.00001). The forest plot is shown in Figure 2.
Figure 2 The forest plot of effect sizes for males.
For females, data from seven studies were included in the first analysis, but data from Goodman et al49 were excluded for the same reason, reducing heterogeneity from I2=75% to an acceptable I2=29%. After the exclusion of this study, the OR (95% CI) for females (n=6,234) was 0.65 (0.52–0.81), Cochran Q =7.8, df=5 (P=0.290) indicating that PA reduced the odds of females demonstrating sarcopenia. The test for overall effect was weaker than in males at Z=3.79; however, it was still statistically significant (P<0.0001). The forest plot is shown in Figure 3.
Figure 3 The forest plot of effect sizes for females.
When combining males and females (nine studies), and after excluding two studies49,55 through sensitivity analysis, data from the overall population (n=4,605) showed the strongest estimation with an OR (95% CI) of 0.45 (0.37–0.55), Cochran Q =8.1, df=6 (P=0.230) indicating that PA reduced the odds of patients suffering from sarcopenia. The test for overall effect was strong at Z=7.76 (P<0.00001), and heterogeneity was sufficiently acceptable I2=26%. The forest plot from this analysis is presented in Figure 4.
Figure 4 The forest plot of effect sizes for males and females.
An emerging body of evidence shows that PA plays a preventive role against many diseases such as coronary heart disease, obesity, type 2 diabetes, hypertension, peripheral vascular disease, high cholesterol, osteoporosis, osteoarthritis, and chronic obstructive pulmonary disease. Data from our systematic review and meta-analysis, similar to that of previous authors,14,15 also show that PA protects against sarcopenia. Our results are also in concordance with three recent meta-analyses: one including eight trials reporting that exercise can increase gait speed, balance, and activities of daily living in frail older adults,67 another incorporating 19 trials that concluded that exercise has some benefits in frail older people,68 and a third synthesizing data from 18 studies, which provided evidence that physical exercise therapy could improve mobility and physical functioning even among older patients with mobility problems and physical disability.69 Although there is conformity among our work and these meta-analyses, it should be pointed out that the other meta-analyses were focused mostly on randomized controlled trials while our meta-analysis combined diverse studies of PA, which was typically identified by self-report. It is worth mentioning that the method of acquiring PA data largely varies among studies. In involved studies, some people performed PA such as regular housework, gardening, or did an occupational activity involving the carrying of light or heavy objects. They also occasionally walked, did slow swimming, played doubles tennis, volleyball, did vigorous exercise such as running, climbing, fast cycling, fast swimming, football, basketball, rope jumping, squash, and singles tennis. In the study of Aggio et al,60 participants wore an accelerometer for 7 days during waking hours, which was removed only for water-based activities.
As seen in Table 2, many different methods were used to diagnose sarcopenia, which may result in increased risk of publication bias, which has been previously described.70 For example, Goodman et al49 used only one standard deviation below a young reference group as the cutoff value for diagnosing sarcopenia, which may have caused a large percentage of the population to be falsely identified as sarcopenic. Another weakness of our review was that we did not include subgroup analyses, as there were only a few studies for making subgroups according to sarcopenia diagnosing or several different physical activities as well as metabolic equivalent of task (MET). Therefore, we recommend that future research should unify diagnostic methods according to consensus. This may improve our knowledge of how PA plays a role in sarcopenia protection. Finally, it should be mentioned that we used only four databases and the terms “sarcopenia” and “physical activity” may not have unearthed 100% of the research in this area. However, we believe that despite this limitation, the review is beneficial, as it is the first systematic review and meta-analysis on the topic.
In summary, when participants did at least some PA, they had better odds of avoiding sarcopenia. Our results support the recommendation of the American College of Sports Medicine (ACSM) and the American Heart Association (AHA) that regular PA, including occupational activity, aerobic sport activity, and muscle-strengthening activity, is essential for healthy aging.71
Most likely, the association between PA and the protection of muscle mass is common sense. However, this is the first systematic review and meta-analysis to confirm this association on the basis of cross-sectional and cohort studies. Moreover, it seems that the type of PA that is undertaken is not important, because except for one study that showed an association between PA and worsening sarcopenia, studies including several different PA showed that PA acts as a protective factor against sarcopenia.
The research presented in this article was carried out as part of the Marie Curie Initial Training Network (ITN) action, H2020-MSCA-ITN-2015, under grant agreement number 676265, the AZV research projects 16-29182A, and 15-32942A-P09 of the Ministry of Health and projects Q 41 and P 20.
The authors report no conflicts of interest in this work.
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