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VLamax Correlates Strongly With Glycolytic Performance
Boris Clark1, Paul W Macdermid2
1Cycling New Zealand.
Research Quarterly for Exercise and Sport
|April 18, 2025
Summary
The maximal glycolytic rate (MGR) is a relevant indicator for athletes, but power output during a 15-second isokinetic test is a more practical measure. This study found MGR lacks scientific validation for accurately estimating glycolytic rate.
Area of Science:
- Exercise Physiology
- Sports Science
- Biochemistry
Background:
- Maximal glycolytic rate (MGR) is a key physiological metric for assessing anaerobic capacity in athletes.
- Accurate estimation of MGR is crucial for optimizing training and performance in glycolytically demanding sports.
- Existing methods for MGR assessment require further validation and practical application in field settings.
Purpose of the Study:
- To investigate the relationship between maximal glycolytic rate (MGR) and power output during high-glycolytic cycle ergometry efforts.
- To determine the influence of MGR and other physiological markers on the respiratory compensation point.
- To assess the validity of MGR as an indicator of maximal glycolytic rate in endurance cyclists.
Main Methods:
- Eleven elite endurance cyclists performed a 15-second isokinetic test with lactate measurements to determine MGR.
- Participants also completed a 1-minute maximal effort test and a ramp test to exhaustion on a cycle ergometer.
- Data analysis involved correlating MGR with power output from different efforts and examining its effect on respiratory compensation point.
Main Results:
- Strong correlations were observed between MGR and mean absolute (r=0.83) and relative (r=0.88) power during the lactic interval of the 15-second isokinetic test.
- These relationships weakened significantly when comparing MGR with power output from a 1-minute maximal effort test.
- Combined MGR and other physiological data positively influenced the estimation of the respiratory compensation point.
Conclusions:
- Maximal glycolytic rate (MGR) is a relevant indicator of glycolytic capacity but lacks current scientific validation for precise estimation.
- Power output from a 15-second isokinetic test provides comparable information to MGR for assessing maximal glycolytic rate.
- Practitioners can effectively gauge athletes' maximal glycolytic rate by measuring power output during glycolytically demanding efforts.
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