Cited by 389Physical Activity and HealthCardiovascular and exercise physiologyDiabetes, Cardiovascular Risks, and Lipoproteins

Adverse metabolic response to regular exercise: is it a rare or common occurrence?

Open access
Bouchard, Claude, Blair, Steven N., Church, Timothy S., Earnest, Conrad P., Hagberg, James M., Häkkinen, Keijo, Jenkins, Nathan T., Karavirta, Laura +7 more·2012·PLoS ONE

Abstract

BACKGROUND: Individuals differ in the response to regular exercise. Whether there are people who experience adverse changes in cardiovascular and diabetes risk factors has never been addressed. METHODOLOGY/PRINCIPAL FINDINGS: An adverse response is defined as an exercise-induced change that worsens a risk factor beyond measurement error and expected day-to-day variation. Sixty subjects were measured three times over a period of three weeks, and variation in resting systolic blood pressure (SBP) and in fasting plasma HDL-cholesterol (HDL-C), triglycerides (TG), and insulin (FI) was quantified. The technical error (TE) defined as the within-subject standard deviation derived from these measurements was computed. An adverse response for a given risk factor was defined as a change that was at least two TEs away from no change but in an adverse direction. Thus an adverse response was recorded if an increase reached 10 mm Hg or more for SBP, 0.42 mmol/L or more for TG, or 24 pmol/L or more for FI or if a decrease reached 0.12 mmol/L or more for HDL-C. Completers from six exercise studies were used in the present analysis: Whites (N = 473) and Blacks (N = 250) from the HERITAGE Family Study; Whites and Blacks from DREW (N = 326), from INFLAME (N = 70), and from STRRIDE (N = 303); and Whites from a University of Maryland cohort (N = 160) and from a University of Jyvaskyla study (N = 105), for a total of 1,687 men and women. Using the above definitions, 126 subjects (8.4%) had an adverse change in FI. Numbers of adverse responders reached 12.2% for SBP, 10.4% for TG, and 13.3% for HDL-C. About 7% of participants experienced adverse responses in two or more risk factors. CONCLUSIONS/SIGNIFICANCE: Adverse responses to regular exercise in cardiovascular and diabetes risk factors occur. Identifying the predictors of such unwarranted responses and how to prevent them will provide the foundation for personalized exercise prescription.

AI snapshot

Written from the paper’s full text.

TL;DR

Adverse metabolic responses to regular exercise—worsening of systolic blood pressure, HDL-cholesterol, triglycerides, or fasting insulin beyond measurement error—occur in a nontrivial minority of adults across six exercise studies. The paper estimates prevalences of roughly 8%–13% per risk factor and about 7% for two or more risk factors.

Key findings

  • Across six exercise studies (maximum N = 1,687), adverse responder prevalence was 8.3% for fasting insulin (abstract states 8.4%), 13.3% for HDL-C, 10.3% for triglycerides, and 12.2% for systolic blood pressure.
  • In HERITAGE, 6%–9% of Blacks and Whites experienced adverse responses for each of the four risk factors, with no substantive differences between ethnic groups.
  • About 7% of participants experienced adverse responses in two or more risk factors; Table 8 reports 6% with exactly two and 0.8% with three or four.
  • Adverse response traits appeared independent of cardiorespiratory fitness improvement: only 2 of 56 tested differences in VO2max gain between adverse and non-adverse responders reached p ≤ 0.05, far from a Bonferroni-adjusted p = 0.0009. DREW showed no substantive differences in adverse response prevalence across 4, 8, or 12 kcal/kg/week exercise doses.

Methods

  • Secondary analysis of completers from six exercise intervention studies: HERITAGE (473 Whites, 250 Blacks), DREW (326), INFLAME (70), STRRIDE (303), MARYLAND (160), and JYVASKYLA (105), for a maximum of 1,687 men and women.
  • Adverse response was defined as an exercise-induced change at least 2× the technical error (TE) in an adverse direction: increase ≥10 mm Hg for systolic BP, ≥0.42 mmol/L for triglycerides, ≥24 pmol/L for fasting insulin, or decrease ≤0.12 mmol/L for HDL-C. TE was derived from 60 subjects measured three times over 3 weeks, except fasting insulin, for which assays were performed twice and TE was estimated using other HERITAGE data plus literature.
  • Analyses included prevalence tabulations, paired t tests for within-cohort mean changes, general linear models comparing VO2max gains between adverse and non-adverse responders with age, sex, and baseline VO2max as covariates, and a DREW dose comparison.

Limitations

  • The paper states that the causes of adverse responses are unknown, that exercise-drug interactions cannot be directly tested with available data, and that it is unknown whether some adverse responders would revert with different exercise doses or modalities; findings also need extension to other risk factors such as LDL-cholesterol, inflammation markers, and adiposity traits.
  • Evident from the text: this is a secondary analysis of completers from heterogeneous studies with differing protocols and health statuses, some trait data are unavailable (e.g., STRRIDE systolic BP is N/A), and the fasting insulin TE was not based on three repeated measurements but estimated from other data and literature.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1371/journal.pone.0037887

Cites

34 of 34 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 15 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Adverse responses to regular exercise in cardiovascular and diabetes risk factors occur.

    “Adverse responses to regular exercise in cardiovascular and diabetes risk factors occur.”
    • Also stated in: § Discussion · plain
      “Thus, some individuals experience ARs when exposed to regular exercise, but the causes of the phenomenon are unknown at this time.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Completers of the six exercise studies are representative of sedentary adults generally.
  • Findingown data

    Among the same 1,687 subjects, the prevalence of adverse responses reached 10.3%-10.4% for triglycerides.

    “Numbers of adverse responders reached 12.2% for SBP, 10.4% for TG, and 13.3% for HDL-C.”
    • Also stated in: § Results · plain
      “Based on a maximum of 1687 subjects, the prevalence of an AR reached 8.3% for the changes in FI, 13.3% for the changes in fasting HDL-C, 10.3% for TG, and 12.2% for resting SBP.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The technical error estimates derived from the HERITAGE ancillary study apply to the other five exercise studies.
    • Rests on an assumption: The six exercise studies are sufficiently comparable to pool for estimating overall prevalence of adverse responses.
    • Rests on an assumption: Attrition in the six studies did not bias the prevalence estimates of adverse responses.
  • Findingnone given

    All gains in VO2max in the six cohorts were significant at p<0.05.

    “All gains in VO2max are significant at p<0.05.”
    Quote in the paperNot a substantial claim
  • Findingown data

    Substantial numbers of subjects with or without medication in these cohorts experienced one or more adverse responses.

    “Yet substantial numbers of subjects with or without medication in these cohorts experienced one or more ARs.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Medication use reported in the cohorts is accurate and does not confound the comparison of adverse response prevalence.
  • Findingown data

    Only a small minority of participants (<1%) exhibited adverse responses for three or more traits.

    “Only a small minority of participants (<1%) exhibited ARs for three or more traits.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The six exercise studies are sufficiently comparable to pool for estimating overall prevalence of adverse responses.
    • Rests on an assumption: Attrition in the six studies did not bias the prevalence estimates of adverse responses.
  • May combine two claims. 6
  • The quote only partly states this claim. 1
  • Classified as probably not a substantial claim. 1
  • May combine two claims.

    Findingown data

    In HERITAGE, 6% to 9% of Blacks and Whites experienced adverse responses for each of the four risk factors, with no substantive differences between the two ethnic groups.

    “Although HERITAGE subjects were apparently healthy and not taking medication for blood pressure, glucose, or lipid anomalies and were exposed to the same exercise program, 6% to 9% of Blacks and Whites experienced ARs for each of the four risk factors, with no substantive differences between the two ethnic groups.”
    Quote in the paperSubstantial claim
  • The quote only partly states this claim.

    Findingown data

    Among 1,687 men and women from six exercise studies, 126 subjects (8.3%-8.4%) had an adverse change in fasting insulin.

    “Using the above definitions, 126 subjects (8.4%) had an adverse change in FI.”
    • Also stated in: § Results · plain
      “Based on a maximum of 1687 subjects, the prevalence of an AR reached 8.3% for the changes in FI, 13.3% for the changes in fasting HDL-C, 10.3% for TG, and 12.2% for resting SBP.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: The technical error estimates derived from the HERITAGE ancillary study apply to the other five exercise studies.
    • Rests on an assumption: The six exercise studies are sufficiently comparable to pool for estimating overall prevalence of adverse responses.
    • Rests on an assumption: Attrition in the six studies did not bias the prevalence estimates of adverse responses.
  • May combine two claims.

    Findingown data

    The mean changes induced by the exercise programs were generally in the expected direction (decreases in fasting insulin, triglycerides, and systolic blood pressure and increases in HDL-C), with some statistically nonsignificant exceptions.

    “The mean changes induced by the exercise programs were generally in the expected direction (i.e., decreases in FI, TG, and SBP and increases in HDL-C). There were, however, some statistically nonsignificant exceptions to these general trends.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The four risk factors (systolic blood pressure, fasting insulin, HDL-cholesterol, and triglycerides) are valid indicators of cardiovascular and diabetes risk.
  • May combine two claims.

    Findingown data

    No evidence was found for differences in the prevalence of adverse responses between Blacks and Whites or between men and women.

    “In summary, we did not find any evidence for differences in the prevalence of ARs between Blacks and Whites or between men and women.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Study design and conductown data

    For fasting insulin, the technical error was estimated using only two assays plus other HERITAGE data and observations from the literature.

    “In the case of FI, the assays were performed only twice, and we used other HERITAGE data plus observations from the literature to develop an estimate of TE for FI (Information S1).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    The genetic component of a response trait can be defined in terms of RNA abundance observed in the sedentary state or by specific genomic variants.

    “There are strong indications from a baseline skeletal muscle gene expression profile and from a genome-wide association study performed on the Whites of HERITAGE that the genetic component of a response trait can be defined in terms of RNA abundance observed in the sedentary state or by specific genomic variants [31], [32], [33].”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [31] C Bouchard, 2011, Genomic predictors of the maximal O uptake response to standardized exercise training programs., J Appl Physiol source
    • cites [32] JA Timmons, 2010, Using molecular classification to predict gains in maximal aerobic capacity following endurance exercise training in humans., J Appl Physiol source
    • cites [33] T Rankinen, 2012, The heritability of submaximal exercise heart rate response to exercise training is accounted for by nine SNPs., J Appl Physiol source
  • May combine two claims.

    Premisecitation

    The heritability of exercise-induced changes reached about 30% for plasma HDL-C and triglycerides and about 20% to 25% for indicators of insulin metabolism and resting systolic blood pressure.

    “In fact, the heritability of the changes induced by the exercise program reached about 30% for plasma HDL-C and TG [26] and about 20% to 25% for indicators of insulin metabolism and resting SBP [29], [30].”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [26] T Rice, 2002, Familial aggregation of blood lipid response to exercise training in the health, risk factors, exercise training, and genetics (HERITAGE) Family Study., Circulation source
    • cites [29] P An, 2005, Genome-wide linkage scans for prediabetes phenotypes in response to 20 weeks of endurance exercise training in non-diabetic whites and blacks: the HERITAGE Family Study., Diabetologia source
    • cites [30] T Rice, 2002, Heritability of HR and BP response to exercise training in the HERITAGE Family Study., Med Sci Sports Exerc source
  • May combine two claims.

    Interpretationown data

    Adverse responses for common cardiometabolic and diabetes risk factors are much more prevalent than acute exercise-related cardiac events and become evident with exposure to regular exercise.

    “In contrast, ARs as defined herein for common cardiometabolic and diabetes risk factors are much more prevalent and become evident with exposure to regular exercise.”
    Quote in the paperSubstantial claim
8 of 8
  • The paper relies on this without support.

    Completers of the six exercise studies are representative of sedentary adults generally.

    “Approximately 7% of sedentary adults experienced ARs for at least two common cardiometabolic and diabetes risk factors following exposure to regular exercise.”
  • The paper relies on this without support.

    The technical error estimates derived from the HERITAGE ancillary study apply to the other five exercise studies.

    “An ancillary study designed to quantify TE for several biological traits was undertaken in HERITAGE.”
    “These AR definitions are used in the remainder of this report.”
  • The paper relies on this without support.

    The six exercise studies are sufficiently comparable to pool for estimating overall prevalence of adverse responses.

    “Based on a maximum of 1687 subjects, the prevalence of an AR reached 8.3% for the changes in FI, 13.3% for the changes in fasting HDL-C, 10.3% for TG, and 12.2% for resting SBP.”
  • The paper relies on this without support.

    Attrition in the six studies did not bias the prevalence estimates of adverse responses.

    “Completers from six exercise studies were used in the present analysis”
  • The paper relies on this without support.

    The four risk factors (systolic blood pressure, fasting insulin, HDL-cholesterol, and triglycerides) are valid indicators of cardiovascular and diabetes risk.

    “with a focus on exercise-induced changes in resting systolic blood pressure (SBP), fasting insulin (FI), HDL-cholesterol (HDL-C), and triglycerides (TG).”
  • The paper relies on this without support.

    Medication use reported in the cohorts is accurate and does not confound the comparison of adverse response prevalence.

    “many subjects in DREW, INFLAME, MARYLAND, and STRRIDE were taking medications for high blood pressure, hyperglycemia, or dyslipoproteinemia. Yet substantial numbers of subjects with or without medication in these cohorts experienced one or more ARs.”
6 of 6

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • For 20% to 25% of participants undertaking an exercise programme there is little to no favourable response, while 5% to 10% have adverse events.

    “It has been previously suggested that for 20% to 25% of participants undertaking an exercise programme there is little to no favourable response (Timmons 2014), while a small percentage (5% to 10%) have adverse events (Bouchard 2012).”
  • About 7-15% of individuals showed an adverse response in systolic blood pressure and fasting HDL cholesterol, triglycerides and insulin after chronic exercise.

    “7–15% of individuals demonstrated an ‘adverse response’ regarding alterations in systolic blood pressure, as well as in fasting levels of HDL cholesterol, triglycerides and insulin25,26.”

    From Exerkines in health, resilience and disease (2022) · cites this paper as [26]

  • In humans, metabolic non-response or adverse responses to exercise have been described.

    “Moreover, in humans, metabolic non-response or even adverse responses to exercise have been described26.”

    From Exerkines in health, resilience and disease (2022) · cites this paper as [26]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Fasting-insulin adverse-response prevalence differs

    Minor

    The abstract reports 8.4% for fasting insulin, while the Results and Table 5 report 8.3% for the same 126 adverse responders.

  • Triglyceride adverse-response prevalence differs

    Minor

    The abstract reports 10.4% for triglycerides, while the Results and Table 5 report 10.3%.

2 of 2

Cites

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Authors
Bouchard, C., Blair, S. N., Church, T. S., Earnest, C. P., Hagberg, J. M., Häkkinen, K., Jenkins, N. T., Karavirta, L., Kraus, W. E., Leon, A. S., Rao, D. C., Sarzynski, M. A., Skinner, J. S., Slentz, C. A., & Rankinen, T.
Affiliations
  • Pennington Biomedical Research Center (US)
  • University of South Carolina (US)
  • University of Maryland, College Park (US)
  • University of Jyväskylä (FI)
  • Duke Medical Center (US)
  • University of Minnesota (US)
  • Washington University in St. Louis (US)
  • Indiana University Bloomington (US)
Corresponding author
Bouchard, Claude
Venue
PLoS ONE
Published
2012-05-30
Volume
7
Issue
5
Pages
e37887
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2085568044
Cited by
389
References
33
Citations by year
2026: 9 · 2025: 15 · 2024: 20 · 2023: 12 · 2022: 21 · 2021: 35 · 2020: 22 · 2019: 41 · 2018: 40 · 2017: 37 · 2016: 27 · 2015: 25 · 2014: 31 · 2013: 46 · 2012: 5
FWCI
20.30
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Jyväskylä University Digital Archive (University of Jyväskylä) (acceptedVersion, cc-by)
  • Digital Commons@Becker (Washington University School of Medicine) (submittedVersion)
  • Europe PMC (PubMed Central) (submittedVersion, cc-by)
  • PubMed Central (submittedVersion, cc-by)
  • Scholar Commons (University of South Carolina) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • IUScholarWorks (Indiana University) (submittedVersion, cc-by)
Topics
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
diabetes risk factors, fasting insulin, systolic blood pressure, HDL cholesterol, triglycerides, within-person variability, exercise prescription, racial differences
MeSH terms
Adult, Aged, Basal Metabolism, Blood Pressure, Cardiovascular Diseases, Diabetes Mellitus, Exercise Therapy

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