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Effect of Glycogen Replenishment on Time Trial Performance Following a Glycogen Lowering Exercise

NCT03682861 · Status: UNKNOWN · Phase: NA · Type: INTERVENTIONAL · Enrollment: 15

Last updated 2018-12-05

No results posted yet for this study

Summary

Fifteen endurance-trained male/female will be randomly assigned to do four exercise and nutrition trials involving ingestion of four different concentrations of sweet corn derived starch (food component) in water (0, 1, 1.5 and 2 g. kg-1. h-1). Each trial will be separated by at least one week. During these four experimental trials athletes will be subjected to a glycogen-lowering cycling exercise protocol followed by a 4-h post-exercise recovery period (2h feeding then 2 hours of rest). At the end of 4-h period they will do a 20 kilometre time trial test on a stationary bike in a laboratory condition to measure the effect of different glycogen repletion rates on exercise performance.

Conditions

  • Carbohydrate Metabolism

Interventions

BEHAVIORAL

20 km time trial performance

20 km time trial cycling test will be conducted to measure the effect of different drinks on time

BEHAVIORAL

Glycogen lowering exercise

Glycogen will be lowered using a 10-min warm-up period at a workload of 50% max wattage power output (Wmax). Thereafter, participants will be instructed to cycle 2-min block periods at alternating workloads of 90% and 50% of Wmax, respectively. This will be continued until the participants are no longer able to complete the 2 min at 90% Wmax. That moment will be defined as the time at which the individual is unable to maintain cycling speed at 60 revolutions/min. At that moment the high-intensity block will be reduced to 80% Wmax. Again, athletes will cycle until they are unable to complete a 2-min block at 80% Wmax, after which the high-intensity block will be reduced to 70% Wmax. Finally, participants will be allowed to stop when pedalling speed could not be maintained at 70% Wmax.

Sponsors & Collaborators

  • Western University, Canada

    lead OTHER

Principal Investigators

  • Peter Lemon, PhD · Western University

Study Design

Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
40 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2018-09-30
Primary Completion
2019-09-30
Completion
2019-09-30

Countries

  • Canada

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03682861 on ClinicalTrials.gov