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Determining the Contribution of the Energy Systems During Exercise

Determining the Contribution of the Energy Systems During Exercise

Published on: March 20, 2012

An approach to estimating gross efficiency during high-intensity exercise.

Jos J de Koning¹, Dionne A Noordhof, Tom P Uitslag

¹Research Inst MOVE, VU-University, Amsterdam, The Netherlands.

International Journal of Sports Physiology and Performance

|September 26, 2012

Summary

This study introduces a back-extrapolation method to estimate gross efficiency (GE) during high-intensity exercise. This technique provides valuable insights into GE when direct measurement is challenging.

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Area of Science:

Sports Science
Exercise Physiology
Biomechanics

Background:

Gross efficiency (GE) is crucial for performance in endurance sports.
Traditionally, GE measurement requires VO(2) assessment during submaximal exercise.
Estimating GE during high-intensity exercise presents a significant challenge.

Purpose of the Study:

To propose and evaluate a novel method for estimating gross efficiency (GE) during high-intensity exercise.
To assess the feasibility of back-extrapolating GE data from submaximal efforts to infer GE during intense exercise bouts.

Main Methods:

Nineteen subjects underwent maximal incremental and Gross Efficiency (GE) tests.
The GE test involved cycling at 50% peak power output (PPO), interspersed with high-intensity (100% PPO) and low-intensity (25 W) intervals.
Linear regression was used to back-extrapolate GE from the second 50% PPO segment to the end of the 100% PPO bout.

Main Results:

Back-extrapolation yielded a calculated GE of 15.8% ± 1.7% at the end of the 100% PPO bout.
This contrasts with the 18.3% ± 1.3% GE measured during the initial 50% PPO phase.
The findings suggest a decrease in GE during the high-intensity interval.

Conclusions:

Back-extrapolation of GE data appears to be a valuable method for understanding efficiency during high-intensity exercise.
This technique offers a potential solution for assessing GE in scenarios where direct measurement is impractical.
Further research can refine this method for broader application in sports science.