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Medicine & Science in Sports & Exercise:
Epidemiology

Physical fitness and activity as separate heart disease risk factors: a meta-analysis

WILLIAMS, PAUL T.

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Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

April 2000

July 2000

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Abstract

WILLIAMS, P. T. Physical fitness and activity as separate heart disease risk factors: a meta-analysis. Med. Sci. Sports Exerc., Vol. 33, No. 5, 2001, pp. 754–761.

Objective: Public health policies for physical activity presume that the greatest health benefits are achieved by increasing physical activity among the least active. This presumption is based largely on studies of cardiorespiratory fitness. To assess whether studies of cardiorespiratory fitness are germane to physical activity guidelines, we compared the dose-response relationships between cardiovascular disease endpoints with leisure-time physical activity and fitness from published studies.

Data Sources: Twenty-three sex-specific cohorts of physical activity or fitness (representing 1,325,004 person-years of follow-up), cited in Tables 4-1 and 4-2 of the Surgeon General’s Report.

Data Synthesis: Relative risks were plotted as a function of the cumulative percentages of the samples when ranked from least fit or active, to most fit or active. To combine study results, a weighted average of the relative risks over the 16 physical activity or seven fitness cohorts was computed at every 5th percentile between 5 and 100%. The analyses show that the risks of coronary heart disease or cardiovascular disease decrease linearly in association with increasing percentiles of physical activity. In contrast, there is a precipitous drop in risk occurring before the 25th percentile of the fitness distribution. As a consequence of this drop, there is a significant difference in the risk reduction associated with being more physically active or physically fit (P ≤ 0.04).

Conclusions: Being unfit warrants consideration as a risk factor, distinctly from inactivity, and worthy of screening and intervention. Formulating physical activity recommendations on the basis of fitness studies may inappropriately demote the status of physical fitness as a risk factor while exaggerating the public health benefits of moderate amounts of physical activity.

Physical activity is defined as voluntary movement produced by skeletal muscles that results in energy expenditure, whereas cardiorespiratory fitness relates to the ability of circulation and respiration to supply oxygen during sustained physical activity (6,57). In the formulation of current physical activity guidelines, cardiorespiratory fitness is often treated as a surrogate (purportedly more accurate) measure of physical activity (13,38,41,57). The pooling of prospective epidemiological studies of cardiorespiratory fitness and physical activity have led to current government guidelines which presume that the greatest health benefits will be achieved by increasing physical activity among the least active members of society (57). The National Institutes of Health consensus development conference stated that: “The most active individuals have lower cardiovascular morbidity and mortality rates than do those who are least active; however, much of the benefit appears to be accounted for by comparing the least active individuals to those who are moderately active”(41). A special report by the American Heart Association repeats these conclusions, agreeing that “The greatest potential for reduced mortality is in the sedentary who become more active.”(13). In fact, the relationship between physical activity dose and health published by the Centers for Disease Control and Prevention purports nine-fold greater health benefit from increasing physical activity status in sedentary, compared with physically active, individuals (38,58).

The above-mentioned policies for promoting physical activity depend upon showing that either: 1) there is a pronounced nonlinear dose-response relationship between disease risk and physical activity, or that 2) fitness-based studies are relevant to the formulation of physical activity recommendations. To this end, the dose-response relationships between leisure-time physical activity, or fitness, and cardiovascular disease endpoints were assessed for the studies cited in the Surgeon General’s report on physical activity and health (57).

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METHODS

The Surgeon General’s report cites forty population-based studies associating self-reported physical activity to coronary heart disease (CHD) or cardiovascular diseases (CVD, including both CHD and stroke). Twelve studies were excluded from the analyses for examining only occupational, rather than leisure, or total, physical activity; one for its case-control design (34); three for presenting only two activity categories (26,39,45,46); and three for not reporting the percentage of men within each activity category (21,30,44). Also excluded were two early reports from the Honolulu Heart Program (8,56), two early reports on British Civil Servants (7,36), and one report from the Harvard Alumni Study (36a) because later reports supersede them. A 1991 paper on the British Regional Heart Study (48) was selected over a 1994 paper (49) because the earlier paper reported more person-years of follow-up. The remaining sixteen cohorts represent a total of 1,012,809 person-years of follow-up (Table 1). Of these, nine of the studies report rates for CHD (16,18,20,27,35,42,48,51,53) and five report rates for CVD (1,22,24,37,50) (CVD rates were used when both CHD and CVD were reported).

Table 1
Table 1
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The physical activity questionnaires differ by recall period (2 wk (1,24), 4 wk (35), 12 months (20,27,51,53), or usual activity (16,18,22,37,42,48,50)) and whether they rank physical activity by total expenditure or intensity. Four reports rank subjects by total energy expenditure from hours spent at different intensities of physical activity over a 24-h period and thus include both occupational and leisure time (16,22,42,50). Five studies rank subjects by total estimated caloric expenditure from the intensity, duration, and frequency of specific activities (1,27,48,51,53). Exercise amount is used to rank Harvard alumni by calculating energy expenditure from reported stairs climbed, city blocks walked, and time and type of sports activity (37), and senior HMO members by calculating hours walked (24). British civil servants were analyzed by exercise amount exclusive of vigorous exercise (35). Swedish and Copenhagen men were ranked by intensity from almost completely inactive, having some weekly physical activity totaling 4 h or more, regularly active at more vigorous activity, or partaking in hard physical competitive training (18,20).

The Surgeon General’s report cites 11 population-based papers relating cardiorespiratory fitness with total CVD (1,3,4,11,47) or CHD (11,12,18,29,40,52,53). Two reports (12,29) were excluded for representing earlier reports from the same study (47), one report (3) for representing a subset of an earlier report (4), and two studies for providing insufficient data for computing the dose-response relationship (1,40). The remaining seven sex-specific cohorts represent a total of 312,195 person-years of follow-up (Table 1). The subjects were ranked into fitness categories by cycle ergometers or treadmill tests. Studies that used cycle ergometers measured fitness from indirect estimates of V̇O2max(18), differences between observed and expected work capacity according to body weight (47), or interpolated physical working capacities at a heart rate of 150 bpm (53). Those that used treadmill tests measured fitness from total treadmill test times (4), submaximal heart rates (11), or heart rates after 3 min of walking at 4.8 km·h-1 at 5% grade (52).

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Subsequent Reports Since the Surgeon General’s

Since the Surgeon General’s report, physical activity has been associated with myocardial infarction risk in the Kuopio Ischemic Heart Disease Risk Factor Study (4.9 yr of follow-up of 1166 men (25)), with cardiovascular disease mortality in the Zutphen Elderly Study (10-yr follow-up of 802 Dutch men (2)), the German Cardiovascular Prevention Study (6658 and 7993 person-years of experience for males and females, respectively (33)), postmenopausal Iowa women (4 yr follow-up of 32,763 women (23)), and the Canadian Survey Fitness cohort (7 yr follow-up of 6620 women (55)), and with CHD mortality in Israeli Ischemic Heart Disease Study (160,414 person-years of experience in 8463 men (9)), and CHD incident events in the Atherosclerosis Risk in Communities Study (4–7 yr follow-up of 6188 men and 7852 women) (15), the Scottish Heart Health Cohort Study (7.6 yr follow-up of 5754 men and 5875 women (54)), in three northern Finnish municipalities (10 yr follow-up of 842 men and 953 women) (17), and in the Nurse’s Health Study (7.72 yr follow-up of 72,488 women) (32). Additional years of follow-up were reported by the Göteborg Primary Prevention Study (from 11.8 to 20 yr follow-up (43)) and the Multiple Risk Factor Intervention Trial (from 7 to 16 yr follow-up (28)). Cardiorespiratory fitness (maximal oxygen uptake during a cycle ergometer test) was also examined in relation to myocardial infarction in participants of the Kuopio Ischemic Heart Disease Risk Factor Study (25).

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Meta-Analysis of Fitness and Physical Activity

The diversity of activity and fitness measurements preclude conversion to a common scale of energy expenditure or fitness. Accordingly, relative risks were plotted as a function of the cumulative percentages of the samples when ranked from least fit or active to most fit or active across 20 categories. The least fit or least active category was used as the referent to calculate relative risk. To combine study results, a weighted average was computed for the relative risks of the 16 physical activity or seven fitness cohorts at every 5th percentile between 5 and 100%, e.g., MATHin the case of fitness. To show that the findings were relatively robust to the choice of weights, three approaches were used to pool the relative risks across studies: person-years of follow-up, reciprocal of the squared standard error (the meta-analysis choice of weights), and reciprocal of the squared standard error with interpolation. By establishing consistent results across all three choices of weights, our objective was to make moot arguments concerning which weightings are most appropriate.

Equation U1
Equation U1
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Person-year weights.

Each cohort was represented by a step function having a relative risk value of 1.0 at the 5th percentile and relative risk values at each 5% increment between 0% and 100% determined by the relative risk for the interval, which were then weighted across cohorts by the person-years of experience. For example, in the Lipid Research Clinics (LRC) Mortality Follow-up Study, we assigned a relative risk of 1.0 to all percentiles between 5% and 25%, 0.71 between 30% and 50%, 0.59 between 55% and 75%, and 0.12 between 80% and 100%. Each point received a weight of 0.085 (26,401 person-years divided by 312,195 total person-years). Reported person-years of experience were used to compute the weights, and if these were not presented in the paper, then person-years was computed as the product of sample size and follow-up years.

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Meta-analysis weights.

The natural logarithms of the relative risks (i.e., ln(relative risk) were weighted by the reciprocal of their squared standard errors, divided by the sum of the weights over all studies. Specifically, for cohort i, we calculated the standard error for the log(relative risks) from the formula, MATHin which pi1 and ni1 refer to the event rate and sample size for the lowest fitness or activity category (referent), and pij and nij refer to the event rate and sample size for the interval containing the jth percentile (14). Although technically zero, for the purposes of creating a weighted sum, the “standard error” for the referent was calculated as MATH. Therefore, for the LRC study the log(relative risk) we assigned log relative risks of 0.0, −0.35, −0.53, and −2.14 to the first, second, third, and fourth quartiles, with corresponding “standard errors” of 0.34, 0.37, 0.39, and 0.74. In one study, it was necessary to calculate the standard error from published 95% confidence intervals (47) and the weight for the referent group from the average standard error of the relative risks of the other fitness categories.

Equation U2
Equation U2
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Equation U3
Equation U3
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Meta-analysis weights with interpolation.

The relative risks and their standard errors were assigned to the midpoint of each interval, and linear interpolation was used to estimate the intermediate values. Although this author favors weighting by person-years of experience, all of the above procedures should yield good estimates.

Bootstrap resampling was used to estimate the standard errors for the pooled relative risks and significance levels for the differences in relative risk (10). Specifically: 1) sampling was done with replacement to create a bootstrap data set of 7 fitness and 16 physical activity cohorts; 2) the weighted average of the relative risk for fitness studies, physical activity studies, and the difference between fitness and physical activity studies was determined at each 5% percentile between 0 and 100; and 3) these steps were repeated 1,000,000 times to estimate the standard error for relative risks and their differences. The number of bootstrap iterations will not affect the estimated significance level other than to increase the precision of its estimate. Two-tailed significance levels were computed as 2*minimum (p, 1 − p), for which p is the proportion of times that the relative risks were less than one or relative risk differences were less than zero.

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RESULTS

Figure 1 presents the relative risks of the 7 fitness and 16 physical activity cohorts. Their analyses appear in Table 2 and Figure 2. Focusing first on the analyses that weights each cohort by person-years of experience:

Figure 1
Figure 1
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Table 2
Table 2
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Figure 2
Figure 2
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Result 1: The risks of CHD or CVD decreased linearly in association with increasing percentiles of physical activity.

The pooled results from the 16 cohorts are displayed in Figure 2. Each 1% increase between the first and 100th percentile was associated with a −0.0031 ± 0.0006 reduction in relative risk (±SE), which was significant at P < 0.001. Table 2 shows that each percentile of physical activity ≥ 25th percentile has significantly lower risk of CHD or CVD risk, relative to the least active percentile.

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Result 2: In contrast to the linear reduction in CHD or CVD risk associated with increasing percentiles of physical activity, there is a precipitous decrease in risk occurring before the 25th percentile of the fitness distribution.

Five of the seven fitness cohorts show their greatest decrease in relative risk occurring between the lowest- and second-lowest fitness categories (4,4,18,47,53). The pooled results, displayed in Figure 2, indicate that all percentiles above the 20th are at significantly less risk than the percentiles of least fit individuals. Between the 30th and 100th percentile of the distribution, each percent increase in fitness was associated with a −0.0038 ± 0.0009 reduction in relative risk (P < 0.001).

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Result 3: There is a significant difference in the risk reduction associated with being more physically active or more physically fit.

Relative to the least fit or active percentiles, the relative risk reduction is significantly greater for fitness than physical activity at all percentiles ≥ 25th (Table 2, Fig. 2). After the initial sharp decline in the fitness curve, the risk reduction associated with increasing levels of fitness and increasing levels of physical activity are parallel (i.e., the regression line for fitness between the 30th and 100th percentile (−0.0038 ± 0.0009) has a different intercept but similar slope to the regression line for physical activity (i.e., −0.0024 ± 0.0009 between the 1st and 100th percentile, P = 0.28 for difference, and −0.0031 ± 0.0006 when restricted to within the 30th and 100th percentile, P = 0.51). The significant differences between the physical activity and cardiorespiratory fitness curves persist when the analyses are restricted to CVD endpoints (Fig. 3).

Figure 3
Figure 3
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Results 1–3 appear robust with respect to the particular choice of weights.

Similar results were obtained whether the analyses were based on the person-years of experience (null hypothesis of relative risk = 1) or the standard error of the relative risk estimates (null hypothesis of ln(relative risk)=0). Table 2 presents the significance levels for ln(relative risk) at increasing levels of physical activity or cardiorespiratory fitness. Cardiorespiratory fitness is again associated with a precipitous drop in risk below the 25th percentile of fitness and a gradual, graded risk reduction thereafter. Physical activity shows a gradual, graded reduction in ln(relative risk) from the least to most active individuals. Also as previously demonstrated, the risk reduction associated with fitness after the initial drop stabilized (i.e., after the 25th percentile) parallels that observed with physical activity. Specifically without interpolation, ln(relative risk) is reduced −0.0058 ± 0.0029 per fitness percentile (P < 0.001) between the 30th and 100th percentiles, which is not significantly different (P = 0.11) from the reduction per percentile of activity between 1% and 100% (−0.0034 ± 0.0007, P < 0.001). The corresponding regression slopes for the analyses of interpolated values were −0.0057 ± 0.0033 (P < 0.001) per fitness percentile and −0.0048 ± 0.0008 (P < 0.001) per physical activity percentile. which again are not significantly different from each other (P = 0.38).

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These conclusions are unaffected by the addition of subsequent reports since the Surgeon General’s.

Figure 4 shows that the relationships remain essentially unaltered with the addition of recent reports, which increased the follow-up to 317,908 person-years for studies of fitness and 2,286,806 person-years for studies of physical activity.

Figure 4
Figure 4
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DISCUSSION

Our findings suggest that cardiorespiratory fitness and physical activity have significantly different relationships to CVD (or CHD) risk. Although physical activity increases fitness and may be an appropriate therapy for the unfit, inactivity may not be the principal cause for being unfit when subclinical disease or genetics may be involved. In sedentary subjects, maximal heritability estimates of at least 50% are reported for cardiorespiratory fitness, which may be an underestimate because the estimate includes the attenuating effects of measurement error (5). Formulating physical activity recommendations on the basis of fitness studies may inappropriately demote the status of cardiorespiratory fitness as a risk factor while exaggerating the public health benefits of moderate amounts of physical activity.

The differences observed between the cardiorespiratory fitness and physical activity curves could not be ascribed to either age or disease endpoint. Although the mean age during the midpoint of follow-up was about 5 yr older in the physical activity cohorts than the fitness cohorts, within the 16 physical activity cohorts, there was no significant association between midpoint follow-up age and relative risk at any percentile (analyses not displayed).

It is true that CVD was more frequently reported for the fitness than physical activity cohorts. However, the risk reduction remains significantly greater for fitness than physical activity when the analyses are restricted to the subset of studies reporting CVD endpoints (Fig. 3). At 25% and above, there were significant reductions in relative risk (P < 0.01) for both fitness and activity, with the reduction in relative risk being significantly greater for fitness than for activity (P < 0.025).

Figure 1 shows that the quartiles reported by studies of cardiorespiratory fitness (4 studies used 4 levels, 3 used 5 levels) differed from those reported by studies of physical activity (9 studies used 3 levels, 6 used 4 levels, and 1 used 6 levels). By choosing the first cut point too high, the activity curve could conceal a sharp drop in risk because the drop was lost within the referent class. However, when CVD is considered separate from CHD, choice of cutpoints appears unlikely to bias the comparison between cardiorespiratory fitness and physical activity because their means for the first cutpoint (19.6% vs 17.8%) are not different.

This is not to say that some of the difference in shape between the fitness and activity curves couldn’t arise by the way the samples were partitioned into intervals. However, this assumes that the cutoff points used to define the lowest interval (i.e., the referent group) for the physical activity studies were not result driven. Specifically, it assumes that the investigators would obscure, by accident or design, a reduction in risk among the least active individuals. It is more reasonable to assume that several of the physical activity studies defined broadly the interval for the referent group because there was no trend within the interval. Moreover, a broad referent group would increase statistical power to detect significant reductions in risk for other categories.

Table 3 presents test-retest correlations for physical activity questionnaires and correlations between physical activity and fitness reported by Jacobs et al. (19). We interpret these correlations as showing that cardiorespiratory fitness may be related to physical activity but that cardiorespiratory fitness seems unlikely to be a more accurate, less biased estimate of physical activity than the activity measures themselves for two reasons. First, if fitness is a more accurate measure of physical activity scores than the activity scores themselves, then there are mathematical constraints on the correlations of Table 3 that must apply. Specifically, the physical activity scores should be more strongly correlated with cardiorespiratory fitness than with the scores from a second physical activity questionnaire (test-retest correlations), which they are not (i.e., the nine test-retest correlations for physical activity are all greater than the correlation physical activity versus fitness in Table 3). Second, if fitness is principally a measure of physical activity, then most of the variation in fitness should be explained by physical activity after removing the effects of measurement error (i.e., a correlation near one). The median adjusted correlation for the nine questionnaire scores combined was r = 0.59, or 35% of the variance in fitness explained by physical activity. This leaves a majority of the fitness variance (65%) unexplained. Moreover, the least active individuals may not be the ones characterized by low fitness because fitness correlates poorly with the amounts of light or moderate intensity activity (19). Fitness measures are not necessarily more precisely measured than reported physical activity either. Test-retest correlations for fitness measurements taken 1 month apart were reported by Jacobs et al. (19) as (r = 0.82) for workload at 160 bpm and r = 0.77 for V̇O2max. These values tend to be less than or equal to the test-retest correlations for questionnaires that assess usual physical activity (e.g., Minnesota Leisure Time, r = 0.92; Lipid Research Clinic, r = 0.93; Coronary Artery Risk Development in Young Adults (CARDIA) study, r = 0.88; Baecke, r = 0.93; College Alumnus, r = 0.72; Minnesota Heart Health Program Leisure Index, r = 0.86).

Table 3
Table 3
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The analyses presented in this paper suggest that cardiorespiratory fitness and physical activity have significantly different relationships to combined CVD and CHD risk. The reductions in relative risk are nearly twice as great for cardiorespiratory fitness than physical activity. Individuals below the 25th percentile of the fitness distribution are at substantially higher risk than those at higher percentiles. Being unfit warrants consideration as a risk factor, distinctly from inactivity, and is worthy of screening and intervention. At question is: when is it appropriate to screen for and intervene upon low levels of physical fitness, irrespective of physical activity status?

This work was supported in part by grants HL-58621, HL-45652, and HL-55640 from the National Heart Lung and Blood Institute and was conducted at the Lawrence Berkeley National Laboratory (Department of Energy DE-AC03-76SF00098 to the University of California).

Address for correspondence: Paul T. Williams, Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720; E-mail: PTWilliams@LBL.gov.

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Back to Top | Article Outline
Keywords:

CARDIORESPIRATORY FITNESS,; PHYSICAL ACTIVITY,; CORONARY HEART DISEASE RISK,; CARDIOVASCULAR DISEASE,; PUBLIC HEALTH RECOMMENDATIONS,; DOSE-RESPONSE,; EXERCISE,; EPIDEMIOLOGY,; RELATIVE RISK

© 2001 Lippincott Williams & Wilkins, Inc.

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