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Related Experiment Video

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Randomized Controlled Trial to Study the Acute Effects of Strength Exercise on Insulin Sensitivity in Obese Adults

Randomized Controlled Trial to Study the Acute Effects of Strength Exercise on Insulin Sensitivity in Obese Adults

Published on: December 1, 2023

Glycemic index and endurance performance.

Carolyn M Donaldson¹, Tracy L Perry, Meredith C Rose

¹Dept. of Human Nutrition, University of Otago, Dunedin, New Zealand.

International Journal of Sport Nutrition and Exercise Metabolism

|May 19, 2010

Summary

The glycemic index (GI) of carbohydrates (CHO) does not consistently impact endurance performance. Athletes should prioritize CHO intake and consider individual responses to high-GI (HGI) or low-GI (LGI) options.

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Area of Science:

Sports Nutrition
Exercise Physiology
Metabolic Research

Background:

Athletes often consume low-glycemic index (LGI) carbohydrates before exercise based on limited evidence.
Research findings on the impact of carbohydrate (CHO) glycemic index (GI) on endurance performance are conflicting.
The role of GI in pre-exercise nutrition and its effect on athletic performance remains debated.

Purpose of the Study:

To synthesize current evidence on the relationship between glycemic index (GI) and endurance performance.
To evaluate the impact of pre-exercise, during-exercise, and post-exercise carbohydrate (CHO) GI on athletic outcomes.
To clarify the role of GI in sports nutrition and provide evidence-based recommendations.

Main Methods:

Systematic review of existing research on glycemic index (GI) and endurance performance.
Analysis of studies investigating carbohydrate (CHO) intake before, during, and after exercise.
Evaluation of evidence regarding the effects of high-GI (HGI) and LGI CHO on performance and recovery.

Main Results:

Evidence for LGI carbohydrate (CHO) recommendations before exercise is limited and contested.
The GI of CHO consumed during exercise has a minimal impact on endurance performance, though more research is needed.
High-GI (HGI) CHO intake post-exercise enhances muscle glycogen resynthesis, while LGI CHO may influence fat oxidation for subsequent exercise.

Conclusions:

There is no scientific consensus on whether varying carbohydrate (CHO) glycemic index (GI) impacts endurance performance.
Athletes should focus on adequate CHO intake and individualize their choices of high-GI (HGI) or LGI foods based on personal experience and practical considerations.
Further well-designed research is required to definitively establish the role of GI in optimizing athletic performance and recovery.