Cited by 151Muscle metabolism and nutritionCardiovascular and exercise physiologySports Performance and Training

Sex‐based differences in endurance exercise muscle metabolism: impact on exercise and nutritional strategies to optimize health and performance in women

Open access
Devries, Michaela C.·2016·Experimental Physiology

Abstract

Sex-based differences in substrate metabolism during moderate-intensity endurance exercise have been well established. Compared with men, women show lesser reliance on carbohydrate oxidation and both liver and muscle glycogen during endurance exercise.

Integrity signals

Registry

Crossref · 10.1113/ep085369

Cites

43 of 43 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

10 of 73 cited sources checked · 6 supported · 0 flagged · accuracy not yet measured

  • Premisecitation

    At exercise intensities of 25, 45, 65 and 85% VO2peak, no sex-based differences in free fatty acid oxidation during exercise were observed.

    “At various exercise intensities (25, 45, 65 and 85% VO 2 peak ), no sex-based differences in FFA oxidation during exercise were observed (Burguera et al. 2000;Romijn et al. 2000).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites Burguera et al. 2000 source

      The Abstract reports exercise at 45% of peak oxygen consumption, and Exercise responses reports no significant sex difference in systemic respiratory quotient during exercise. The paper does not establish the claimed result at 25%, 65%, or 85% VO2peak, and its direct FFA measurements concern uptake and release rather than oxidation. Page numbers are unavailable in our copy. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites Romijn et al. 2000 source
  • Interpretationreasoning

    Oestrogen acts primarily on the liver, decreasing glucose release to influence substrate metabolism during END.

    “Collectively, these data suggest that oestrogen acts primarily on the liver, decreasing glucose release to influence substrate metabolism during END.”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites Ruby et al. 1997 source
    • cites Carter et al. 2001a

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Devries et al. 2005 source
  • Premisecitation

    Short-term oestrogen supplementation, at doses mimicking follicular phase, luteal phase or supraphysiological oestrogen concentrations, administered to amenorrheic women or men decreases liver glucose output and muscle uptake.

    “Short-term supplementation of oestrogen (doses to mimic follicular phase, luteal phase and supraphysiological oestrogen concentrations) administered to ammenorrhoeic women or to men decreased liver glucose output and muscle uptake (Ruby et al. 1997;Carter et al. 2001a;Devries et al. 2005)”
    Quote in the paperSubstantial claim1 of 3 sources checked
    • cites Ruby et al. 1997 source
    • cites Carter et al. 2001a

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Devries et al. 2005 source
  • Premisecitation

    As both men and women get older they become less anabolically sensitive than their younger counterparts.

    “as both men and women get older they become less anabolically sensitive than their younger counterparts; however, in addition, older women become less anabolically sensitive than their older male counterparts (Smith et al. 2008).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Smith et al. 2008 source

      The Discussion (page unavailable) reports that feeding increased muscle protein synthesis in older men but not older women, supporting the sentence’s comparison between older women and older men. The study did not test younger adults against its older participants, so it does not establish that both sexes become less anabolically sensitive with age. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • Premisecitation

    Older women become less anabolically sensitive than their older male counterparts.

    “as both men and women get older they become less anabolically sensitive than their younger counterparts; however, in addition, older women become less anabolically sensitive than their older male counterparts (Smith et al. 2008).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Smith et al. 2008 source
  • May combine two claims. 12
  • Classified as probably not a substantial claim. 1
  • May combine two claims.

    Premisecitation

    Oestrogen supplementation increases plasma free fatty acid concentrations and lowers muscle glycogen content.

    “Additionally, oestrogen supplementation has been found to increase plasma FFA concentrations (Ruby et al. 1997) and lower muscle glycogen content (Devries et al. 2005).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites Ruby et al. 1997 source
    • cites Devries et al. 2005 source
  • May combine two claims.

    Premisecitation

    High-intensity interval training (HIIT) increases aerobic capacity in both men and women, but its ability to enhance insulin sensitivity appears to be blunted in women.

    “while high-intensity interval training (HIIT; for the purpose of this review including both sprint-and high-intensity interval training) increases aerobic capacity in both men and women, its ability to enhance insulin sensitivity appears to be blunted in women (Metcalfe et al. 2012;Gillen et al. 2013).”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites Metcalfe et al. 2012 source

      The Results and Discussion report that REHIT increased aerobic capacity in both sexes, while insulin sensitivity improved in men but not women. The claim extends this finding to HIIT generally; the Discussion notes that a previous study of classic HIT did not find a sex difference, and says larger studies are needed to confirm the REHIT observation. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
    • cites Gillen et al. 2013 source

      The Exercise responses and training data section reports increased VO₂peak in the women studied. The Low-volume HIT and markers of insulin sensitivity section reports no improvement in those women and cites a study suggesting improvements in men but not women. This paper does not establish the claim that HIIT increases aerobic capacity in men. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Compared with an optimal dose per meal of 0.24 g/kg in young men, a dose of 0.4 g/kg is required to optimize muscle protein synthesis in older men, which equals 1.2 g/kg/day when translated over three meals per day.

    “work from Moore et al. (2015) found that compared with an optimal dose per meal of 0.24 g kg -1 in young men, a dose of 0.4 g kg -1 is required to optimize muscle protein synthesis in older men, which equals 1.2 g kg -1 day -1 when translated over three meals per day.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Moore et al. 2015 source
  • May combine two claims.

    Premisecitation

    Whether muscle glycogen stores are spared during END in women is contentious; some studies find no effect of sex on muscle glycogen utilization during cycling END, while others find women utilize less muscle glycogen during running or Wingate sprint exercise.

    “Whether muscle glycogen stores are spared during END in women is contentious.Some studies have found no effect of sex on muscle glycogen utilization during cycling END (Tarnopolsky et al. 1995;Roepstorff et al. 2002;Zehnder et al. 2005), whereas others have found, using a running (Tarnopolsky et al. 1990) as opposed to cycling, or a Wingate protocol (30 s high-intensity bike sprint; Esbjörnsson-Li”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Tarnopolsky et al. 1995 source
    • cites Tarnopolsky et al. 1990 source
    • cites Esbjörnsson-Liljedahl et al. 1999 source
  • May combine two claims.

    Interpretationreasoning

    In the fasted state, premenopausal women rely to a greater extent on fat sources and to a lesser extent on carbohydrate and protein sources during endurance exercise than men.

    “Taken together, the findings from sex comparative studies show that in the fasted state premenopausal women rely to a greater extent on fat sources and to a lesser extent on carbohydrate and protein sources during endurance exercise.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Oestrogen supplementation has no effect on whole-body lipolysis, measured as glycerol Ra and Rd, or on muscle glycogen utilization.

    “with no effect on whole-body lipolysis (measured as glycerol R a and R d ; Ruby et al. 1997;Carter et al. 2001a) or muscle glycogen utilization (Tarnopolsky et al. 2001a;Devries et al. 2005).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Ruby et al. 1997 source
    • cites Carter et al. 2001a

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Tarnopolsky et al. 2001a

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    After oestrogen treatment, leucine oxidation during endurance exercise is lower, with no change in protein synthesis or breakdown, resulting in a less negative state of negative protein balance during exercise compared with placebo.

    “after oestrogen treatment leucine oxidation during exercise was lower, with no change in protein synthesis or breakdown during exercise, which resulted overall in a less negative state of negative protein balance during exercise compared with placebo.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Hamadeh et al. 2005 source
  • May combine two claims.

    Interpretationcitation

    Progesterone acts on the muscle, but not the liver, to prevent glycogen sparing.

    “These findings suggest that progesterone acts on the muscle, but not the liver, to prevent glycogen sparing.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites D'Eon et al. 2002 source
  • May combine two claims.

    Premisecitation

    Fat-adaptation diets involve consumption of a high-fat, low-carbohydrate diet and result in increased rates of fat oxidation and decreased muscle glycogenolysis during END, which persist upon carbohydrate restoration.

    “Fat-adaptation diets involve consumption of a high-fat, low-carbohydrate diet and result in increased rates of fat oxidation and decreased muscle glycogenolysis during END, which persist upon carbohydrate restoration (Yeo et al. 2011).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Yeo et al. 2011 source
  • May combine two claims.

    Premisecitation

    Habitual dietary intake influences substrate utilization during exercise, with high-fat diets increasing fat oxidation and high-carbohydrate diets increasing carbohydrate oxidation.

    “habitual dietary intake influences substrate utilization during exercise, with high-fat diets increasing fat oxidation (Burke et al. 2002;Stellingwerff et al. 2006) and high-carbohydrate diets increasing carbohydrate oxidation (Tarnopolsky et al. 1995).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Burke et al. 2002 source
    • cites Stellingwerff et al. 2006 source
    • cites Tarnopolsky et al. 1995 source
  • May combine two claims.

    Premisecitation

    A traditional carbohydrate-loading regimen of 75% energy intake from carbohydrates increases muscle glycogen stores and enhances performance in men but not women.

    “using a traditional carbohydrate-loading regimen (75% energy intake from carbohydrates), Tarnopolsky et al. (1995) found an increase in muscle glycogen stores and enhanced performance in men but not women.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Tarnopolsky et al. 1995 source
  • May combine two claims.

    Premisecitation

    40% of older adults are not meeting the current protein RDA and 10% of older women are not even meeting the estimated average requirement for protein intake (0.66 g/kg/day).

    “40% of older adults are not meeting the current protein RDA and 10% of older women are not even meeting the estimated average requirement for protein intake (0.66 g kg -1 day -1 ; Houston et al. 2008).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Houston et al. 2008 source
  • Classified as probably not a substantial claim.

    Interpretationreasoning

    Given the inherent differences in substrate metabolism during END in the fasted state, the preferential fuel to enhance performance in women may be different from that in men.

    “given the inherent differences in substrate metabolism during END in the fasted state, the preferential fuel to enhance performance in women may be different from that in men and should be explored.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: There is a paucity of research examining the effects of exercise and nutritional regimens aimed to enhance performance and/or health in women.
13 of 13
  • The paper relies on this without support.

    The majority of research supporting strategies to enhance health or endurance exercise performance has been conducted in men.

    “the majority of the research that supports any given strategy to enhance health or endurance exercise (END) performance has been conducted in men.”
  • The paper relies on this without support.

    Studies frequently exclude women as participants because of the potential influence of fluctuating ovarian hormones throughout the menstrual cycle and the potential impact this might have on outcomes.

    “Studies M. C. Devries frequently exclude women as participants because of the potential influence of fluctuating ovarian hormones throughout the menstrual cycle and the potential impact this might have on the outcomes of interest.”
  • The paper relies on this without support.

    There is a paucity of research examining the effects of exercise and nutritional regimens aimed to enhance performance and/or health in women.

    “there is a paucity of research examining the effects of exercise and nutritional regimens aimed to enhance performance and/or health in women.”
  • The paper relies on this without support.

    The evidence that does exist is suggestive of discordance in the effectiveness of nutritional and exercise regimens between the sexes.

    “the evidence that does exist is suggestive of discordance in the effectiveness of nutritional and exercise regimens between the sexes.”
  • The paper relies on this without support.

    Older women appear to be at increased risk for insulin resistance.

    “older women appear to be at an increased risk for insulin resistance.”
  • The paper relies on this without support.

    The optimal dose per meal to support muscle protein synthesis in older women has not been determined.

    “the optimal dose per meal to support muscle protein synthesis in older women has not been determined.”
  • The paper relies on this without support.

    No studies have examined the role of progesterone alone on endurance exercise substrate selection.

    “no studies have examined the role of progesterone alone on endurance exercise substrate selection.”
  • The paper relies on this without support.

    It has not been determined whether lower liver carbohydrate reliance in women is due to lower liver glycogenolysis, gluconeogenesis or both.

    “although it has not been determined whether this is a result of lower liver glycogenolysis, gluconeogenesis or both.”
  • The paper relies on this without support.

    The source of increased glycerol during END remains unknown.

    “the source [plasma free fatty acids (FFA) and/or intramyocellular lipid (IMCL)] of the increased glycerol (reflecting lipolysis) during END remains unknown.”
9 of 9

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?

  • These results are in line with literature outlining larger carbohydrate utilization in men by approximately 4-5%.

    “These results are in line with the literature on the topic outlining larger carbohydrate utilization in men by approximately 4–5% (Tarnopolsky 2000; Devries 2016).”

    From Analysis of sex-based differences in energy substrate utilization during moderate-intensity aerobic exercise (2022) · cites this paper as Devries 2016

    The section ‘Sex-based differences in metabolism during exercise’ says that women rely less on whole-body carbohydrate oxidation than men during moderate-intensity endurance exercise, supporting the direction of the comparison. It does not give an approximately 4–5% difference in carbohydrate utilization; the magnitude attributed to this source is unsupported. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Experimental evidence is inconclusive on whether women have greater capacity to use intramyocellular lipids.

    “Indeed, while women display significantly larger storages of IMCL than men (Roepstorff et al. 2002; Devries et al. 2007), experimental evidence is inconclusive on whether they also have greater capacity to use this substrate.”
  • Women have a greater percentage of IMCL in direct contact with mitochondria after a bout of endurance exercise compared with men, which suggests they may have a greater capacity to use IMCL and a metabolic advantage for endurance when exercising at matched relative intensities.

    “However, women have a greater percentage of IMCL in direct contact with mitochondria after a bout of endurance exercise compared with men, which suggests that they may have a greater capacity to use IMCL (Devries 2016) and, thus, a metabolic advantage for endurance when exercising at matched relative intensities (Boschmann et al. 2002; Tarnopolsky et al. 2007).”
  • Methodological inconsistencies and training status differences between participants within a trial might contribute to observed discrepancies in IMCL utilization.

    “It has been suggested that methodological inconsistencies and training status differences, between participants within a trial, might contribute to these observed discrepancies (Devries 2016).”
  • Both experimental and knowledge-synthesis works demonstrated a significantly lower RER in women, indicating higher whole-body fat oxidation.

    “Both experimental (Friedlander et al. 1998; Horton et al. 1998; Devries et al. 2007; Henderson et al. 2007; Tarnopolsky et al. 1990; 2007) and knowledge-synthesis works (Tarnopolsky 2000; Devries 2016) demonstrated a significantly lower RER in women, indicating higher whole-body fat oxidation.”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Devries, M. C.
Affiliations
McMaster University (CA)
Corresponding author
Devries, Michaela C.
Venue
Experimental Physiology
Publisher
Wiley
Published
2015-11-14
Volume
101
Issue
2
Pages
243-249
ISSN
  • 0958-0670 (ISSN-L)
  • 1469-445X
OpenAlex
W1960002717
Cited by
151
References
42
Citations by year
2026: 13 · 2025: 13 · 2024: 20 · 2023: 22 · 2022: 18 · 2021: 24 · 2020: 9 · 2019: 7 · 2018: 13 · 2017: 5 · 2016: 6
FWCI
0.80
Type
journal article
Language
en
Open access
Locations
  • Experimental Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
sex differences, endurance exercise, exercise metabolism, carbohydrate oxidation, fat oxidation, respiratory exchange ratio, muscle glycogen, liver glycogen, intramyocellular lipid, estrogen, training effects, nutritional strategies, women's health, exercise performance
MeSH terms
Energy Metabolism, Female, Humans, Physical Endurance, Sex Characteristics, Exercise, Muscle, Skeletal

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-11.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-11.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review