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Related Experiment Video

Updated: Mar 28, 2026

Measurement of Insulin- and Contraction-Stimulated Glucose Uptake in Isolated and Incubated Mature Skeletal Muscle from Mice
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Glucose Ingestion Does Not Improve Maximal Isokinetic Force.

Timothy J Fairchild1, Paul Dillon, Caroline Curtis

  • 11School of Psychology and Exercise Science, Murdoch University, Murdoch, Australia;2School of Health Professions, Murdoch University, Murdoch, Australia; and3Kinesiology and Physical Education program, College of Education and Human Development, The University of Maine, Orono, Maine.

Journal of Strength and Conditioning Research
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PubMed
Summary

Glucose ingestion does not enhance maximal isokinetic leg extension force in recreationally active young adults. This study found no significant performance benefits from carbohydrate intake, suggesting it

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Area of Science:

  • Exercise Physiology
  • Nutritional Science
  • Sports Performance

Background:

  • Carbohydrate ingestion is often considered for performance enhancement in athletes.
  • The ergogenic effects of glucose on maximal strength and power output require further investigation, particularly in non-fatigued states.
  • Understanding the time course of potential performance changes after glucose intake is crucial for practical application.

Purpose of the Study:

  • To evaluate the impact of glucose ingestion on maximal isokinetic leg extension force.
  • To determine if any observed performance changes are time-dependent after carbohydrate consumption.
  • To assess the relationship between blood glucose levels and muscular force production.

Main Methods:

  • Double-blinded, placebo-controlled crossover study with 17 recreationally active young adults.
  • Participants ingested either 75g glucose or a placebo drink.
  • Maximal isokinetic leg extension force and electromyography (EMG) were measured at various time points post-ingestion using a dynamometer.

Main Results:

  • Despite a significant increase in blood glucose levels, no significant changes in maximal or mean peak force were observed.
  • Electromyography (EMG) data also showed no significant alterations following glucose ingestion.
  • A small, non-significant reduction in mean force was noted at later time points, with no time-dependent ergogenic effect.

Conclusions:

  • Ingesting glucose does not improve maximal isokinetic leg extension performance in healthy, recreationally active young individuals.
  • Carbohydrate ingestion is unlikely to provide ergogenic benefits for resistance exercise when not in a fatigued state.
  • Further research may explore glucose's effects in different populations or exercise modalities.