Review
The effect of regular aerobic exercise on positive-activated affect: A meta-analysis

https://doi.org/10.1016/j.psychsport.2009.05.009Get rights and content

Abstract

Objective

The purpose of this meta-analysis was to examine the effect of regular aerobic exercise on self-reported positive-activated affect (PAA). Samples from 105 studies (1980–2008) were included yielding 370 effect sizes (ESs) and 9840 participants.

Method

Studies were coded for the following moderators: baseline affect, exercise frequency, intensity, time, program duration, exercise dose, study quality, and study source. The analysis employed multiple measures of affect and corrected for statistical artifacts using the meta-analytical methods of Hunter and Schmidt, 1990, Hunter and Schmidt, 2004.

Results

The overall mean corrected ES(d¯corr) and standard deviation (SDcorr) were .57 and .48, respectively. Two clear moderator effects were found: the inverse association between baseline PAA and ES and the positive association between study quality and ES. The effect also varied with exercise frequency (positive relation) and exercise intensity (negative relation). Exercise dose was only a weak moderator, but the results indicate the following aerobic exercise program as optimal for improving PAA: low intensity (∼30% VO2R), 30–35 min, 3–5 days/wk for 10–12 weeks. Similar effects were found for published and unpublished studies (source). Control conditions produced little change in PAA(d¯corr=.03,SDcorr=.11).

Conclusion

Regular aerobic exercise results in moderate increases in self-reported PAA, but the effects vary by baseline affect and study quality. Exercise-related variables produced weaker moderating effects. PAA was unchanged for control conditions. A more comprehensive understanding of exercise-related affect will emerge when researchers examine the interaction of acute and chronic responses.

Section snippets

Potential moderators

Moderators were selected from the results and theoretical implications of descriptive studies, experimental studies, and quantitative and narrative reviews of the acute and chronic exercise-affect literature.

Description of the database

Searches were performed for studies on aerobic exercise and mood or affect to include activities such as walking, jogging, running, swimming, and cycling. Relevant studies from January 1980 to December 2008 were identified using computer databases (Dissertation Abstracts International, ERIC, Medline, PsychINFO, Pub Med, SPORTDiscus, and World Cat), searches of narrative and quantitative reviews, and books (e.g., Seraganian, 1993). Reference lists from published articles, theses, and colleagues

Analysis

We used a random effects model (Hunter and Schmidt, 1990, Hunter and Schmidt, 2004) and SAS software (Version 9.1.3) to analyze the data. Random effects models are preferred to fixed-effects because varying population effects appear to be the rule rather than the exception for most real-world data (Field, 2003). The SD of population ESs (SDcorr) is an important statistic in random effects models (Hunter & Schmidt, 1990, p. 453). However, outliers inflate the ES variance above that predicted by

Overall meta-analyses

Pre-study exercise vs. control group differences were negligible, d¯corr=.02(SDcorr=.20). The pre–post-control analysis showed little change, d¯corr=.03(SDcorr=.11) and since %Vare ∼ 90%, the remaining variance is likely due to additional uncorrected artifacts (Hunter & Schmidt, 2004), leaving the control group effect hovering around zero. Pre–post-exercise changes were moderate and positive d¯corr=.57(SDcorr=.48), but SDcorr and 90% CrI suggest the presence of moderators. The post-study

Discussion

The overall results indicate a) pre-study samples report similar PAA, b) control conditions leave PAA unchanged, c) aerobic exercise programs increase PAA, and d) post-study exercise vs. post-study control differences are similar to pre–post-exercise effects. The findings provide support for the favorable effect of regular aerobic exercise on PAA and are comparable to those found in meta-analyses for acute exercise (Reed & Ones, 2006).

Summary

The results show that aerobic exercise programs produce favorable increases in PAA. The effect, however, is moderated by pre-program affective state and the degree of internal validity of the study design. Although exercise dose was a weak moderator, the results indicate that an optimal combination of exercise characteristics for enhancing PAA includes low intensity for 30–35 min, 3–5 days/wk for 10–12 weeks. We continue the call for theory-driven research with one goal being the introduction

Acknowledgements

We thank Patrick O'Connor and colleagues for providing references used in this meta-analysis.

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    References marked with an asterisk indicate studies included in the meta-analysis.

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