Cited by 601Cardiovascular and exercise physiologyPhysical Activity and HealthDiabetes, Cardiovascular Risks, and Lipoproteins

Meta-analysis of the effect of structured exercise training on cardiorespiratory fitness in Type 2 diabetes mellitus

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Haddad, E., Wells, G. A., Sigal, R. J., Boul�, N. G., Kenny, G. P.·2003·Diabetologia

Abstract

Aims/hypothesis Low cardiorespiratory fitness is a powerful and independent predictor of mortality in people with diabetes. Several studies have examined the effects of exercise on cardiorespiratory fitness in Type 2 diabetic individuals. However, these studies had relatively small sample sizes and highly variable results. Therefore the aim of this study was to systematically review and quantify the effects of exercise on cardiorespiratory fitness in Type 2 diabetic individuals.Methods MEDLINE, EMBASE, and four other databases were searched up to March 2002 for randomized, controlled trials evaluating effects of structured aerobic exercise interventions of 8 weeks or more on cardiorespiratory fitness in adults with Type 2 diabetes. Cardiorespiratory fitness was defined as maximal oxygen uptake (VO(2max)) during a maximal exercise test.Results Seven studies, presenting data for nine randomized trials comparing exercise and control groups (overall n=266), met the inclusion criteria. Mean exercise characteristics were as follows: 3.4 sessions per week, 49 min per session for 20 weeks. Exercise intensity ranged from 50% to 75% of VO(2max). There was an 11.8% increase in VO(2max) in the exercise group and a 1.0% decrease in the control group (post intervention standardized mean difference =0.53, p<0.003). Studies with higher exercise intensities tended to produce larger improvements in VO(2max). Exercise intensity predicted post-intervention weighted mean difference in HbA(1c) (r=-0.91, p=0.002) to a larger extent than did exercise volume (r=-0.46, p=0.26).Conclusions/interpretation Regular exercise has a statistically and clinically significant effect on VO(2max) in Type 2 diabetic individuals. Higher intensity exercise could have additional benefits on cardiorespiratory fitness and HbA(1c).

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  • In people with diabetes, regular exercise improves glucose control independently of weight loss.

    “Regular physical activity improves glucose control in persons with DM,939–943 even in the absence of weight loss.944–946”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [945]

    The Meta-regression analyses report lower post-intervention HbA1c in exercise groups than in controls, supporting improved glucose control in people with Type 2 diabetes. Neither that section nor the Discussion establishes that the improvement occurred without weight loss; the source also does not address diabetes types beyond Type 2. (LLM, conf=0.87)

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  • Both aerobic and resistance exercise have beneficial effects, and combining both forms regularly has additive benefits.

    “Studies have reported beneficial effects of both aerobic and resistance exercise, and additive benefits when both forms of exercise are combined on a regular basis.853,945,947,952–954”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [945]

    The Discussion reports improved cardiorespiratory fitness from aerobic exercise in people with Type 2 diabetes. The Criteria for considering studies and Description of included trials say that studies with a large resistance component were excluded; the paper therefore does not establish benefits of resistance exercise or additive benefits from combining it with aerobic exercise. No page numbers are available in our copy. (LLM, conf=0.88)

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  • Exercise intensity is generally regarded as the more critical factor in the trainability of VO2peak, with higher intensity exercise conferring larger improvements in cardiorespiratory fitness when exercise is matched for total energy expenditure.

    “Exercise intensity is generally regarded to be the more critical factor in the trainability of VO2peak, with higher intensity exercise conferring larger improvements in cardiorespiratory fitness when exercise is matched for total energy expenditure [31–34].”

    From Twelve weeks of sprint interval training improves indices of cardiometabolic health similar to traditional endurance training despite a five-fold lower exercise volume and time commitment (2016) · cites this paper as [31]

    Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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  • A meta-analysis showed that exercise intensity predicts improvements in overall BG control to a greater extent than exercise volume, suggesting that those already exercising at a moderate intensity should consider undertaking some vigorous PA to obtain additional BG (and likely CV) benefits.

    “A meta-analysis ( 25 ) showed that exercise intensity predicts improvements in overall BG control to a greater extent than exercise volume, suggesting that those already exercising at a moderate intensity should consider undertaking some vigorous PA to obtain additional BG (and likely CV) benefits.”

    From Exercise and Type 2 Diabetes (2010) · cites this paper as [25]

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  • In a meta-analysis, the mean maximal aerobic capacity in diabetic individuals was only 22.4 ml/kg/min, or 6.4 METs, making 4.8 METs (75% of maximal) the highest sustainable intensity.

    “In a meta-analysis, the mean maximal aerobic capacity in diabetic individuals was only 22.4 ml/kg/min, or 6.4 METs ( 25 ), making 4.8 METs (75% of maximal) the highest sustainable intensity.”

    From Exercise and Type 2 Diabetes (2010) · cites this paper as [25]

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Authors
Haddad, E., Wells, G. A., Sigal, R. J., Boul�, N. G., & Kenny, G. P.
Affiliations
University of Ottawa (CA)
Corresponding author
Sigal, R. J.
Venue
Diabetologia
Published
2003-08-01
Volume
46
Issue
8
Pages
1071-1081
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W1969171226
Cited by
601
References
79
Citations by year
2026: 11 · 2025: 18 · 2024: 26 · 2023: 28 · 2022: 30 · 2021: 30 · 2020: 32 · 2019: 30 · 2018: 31 · 2017: 29 · 2016: 45 · 2015: 33 · 2014: 34 · 2013: 30 · 2012: 35
FWCI
2.00
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canadian Institutes of Health Research
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
type 2 diabetes, aerobic exercise, cardiorespiratory fitness, VO2max, exercise intensity, HbA1c, glycemic control, mortality risk
MeSH terms
Diabetes Mellitus, Type 2, Exercise Therapy, Humans, Middle Aged, Oxygen Consumption, Physical Fitness, Respiratory Physiological Phenomena, Exercise, Randomized Controlled Trials as Topic, Databases, Factual, MEDLINE

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