CMJ
Countermovement jump. A common jump test used to monitor lower-body power, fatigue, and neuromuscular readiness.
Glossary
Glossary of performance terms
A practical reference for the testing, physiology, GPS, recovery, and reporting terms used across Metraxon workflows.
Performance testing
2
Reactive strength index
A jump metric that relates jump height to ground contact time. It helps evaluate fast stretch-shortening cycle qualities.
Physiology
3
VO2max
The maximum amount of oxygen an athlete can use during intense exercise. It is a key marker of aerobic capacity.
VLaMax
An estimate of the athlete's maximum lactate production rate. It helps explain anaerobic contribution, sprint capacity, and pacing behavior.
Lactate threshold
The exercise intensity where lactate begins to accumulate faster than it can be cleared. It is often used to guide endurance training zones.
Training load
3
Training load
A summary of how much work an athlete performed. It can combine duration, intensity, session type, GPS data, or subjective effort.
Acute:chronic workload ratio
A comparison between recent workload and longer-term workload. It is used as one context signal, not as a standalone injury prediction.
RPE
Rate of perceived exertion. It captures how hard a session felt to the athlete and can be combined with duration for session load.
GPS & tracking
4
Sprint count
The number of efforts that pass a defined sprint speed threshold. Thresholds should be configured consistently for valid comparisons.
High-intensity distance
Distance covered above a configured speed zone. It is useful for tracking repeated high-speed work in training or matches.
Acceleration
How quickly an athlete increases speed. GPS systems often summarize acceleration events by count, intensity, and distance.
Deceleration
How quickly an athlete reduces speed. Frequent high-intensity decelerations can add meaningful mechanical load.
Recovery & health
2
HRV
Heart rate variability measures the variation between heartbeats. Trends can help contextualize recovery, stress, and readiness.
Resting heart rate
The athlete's heart rate while at rest. Changes can reflect fitness, fatigue, illness, or recovery state.
Reports & analytics
3
Percentile
A position within a comparison group. For example, the 75th percentile means the athlete is above 75% of the reference group for that metric.
Z-score
A standardized score showing how far a value is from the reference average, measured in standard deviations.
Derived metric
A value calculated from one or more raw measurements. Derived metrics should always keep their source context visible.
Built for Metraxon context
Definitions are written for coaches, medical staff, analysts, and administrators using athlete data in Metraxon. Scientific terminology can vary by provider, device, and testing protocol.
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