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Related Experiment Video

Updated: Jul 10, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running

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Published on: July 17, 2020

Effect of CHO loading patterns on running performance.

Y Chen¹, S H S Wong, X Xu

¹Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Hong Kong.

International Journal of Sports Medicine

|November 16, 2007

Summary

For endurance runners, the total amount of carbohydrates consumed during a 3-day loading period is more critical than the meal

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Last Updated: Jul 10, 2026

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Using Gold-standard Gait Analysis Methods to Assess Experience Effects on Lower-limb Mechanics During Moderate High-heeled Jogging and Running

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Published on: September 14, 2017

Area of Science:

Sports Science
Nutritional Physiology
Exercise Metabolism

Background:

Carbohydrate (CHO) loading is a common strategy to enhance endurance performance.
The glycemic index (GI) and glycemic load (GL) of consumed foods may influence metabolic responses and performance.
Optimizing CHO loading protocols requires understanding the impact of different meal characteristics.

Purpose of the Study:

To investigate the effects of 3-day isoenergetic carbohydrate loading with varying glycemic index (GI) and glycemic load (GL) meals on running performance.
To examine the metabolic responses associated with different CHO loading strategies.
To determine whether the amount or the nature of CHO consumed is a more significant factor in endurance performance.

Main Methods:

A randomized crossover study involving nine male runners.
Participants underwent 3-day dietary interventions with different CHO loading protocols (High GI/High GL, Low GI/Low GL, High GI/Low GL).
Performance was assessed via a 1-hour run at 70% VO2max followed by a 10-km time trial.

Main Results:

No significant difference in 10-km run time was observed between the two high-carbohydrate (High GI/High GL and Low GI/Low GL) trials.
Running performance was significantly improved in the Low GI/Low GL trial compared to the High GI/Low GL trial.
Metabolic responses were influenced by the different CHO loading strategies, though not explicitly detailed in the abstract.

Conclusions:

The total amount of carbohydrates consumed during a 3-day isoenergetic loading period appears to be a more critical factor than the specific GI or GL of the meals.
While CHO amount is paramount, the nature of the CHO (GI/GL) may still play a role in modulating performance, as suggested by the comparison between LL and HL trials.
Further research may be warranted to fully elucidate the interplay between CHO quantity, quality, and endurance performance.