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The Missing Layer in Long-Term Athlete Development

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Long-term athlete development is usually framed around building physical and technical qualities over time:

• Strength
• Speed
• Power
• Skill
• Coordination
• Technical proficiency
• Psychological resilience

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Those qualities remain essential.

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But development also requires another question:

• Can the athlete continue to access, adapt, and rebuild those qualities as demands change over time?

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That is where performance durability becomes relevant.

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Development Is More Than Building Capacity

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Traditional assessments are effective at identifying what an athlete can produce:

• Maximum strength. Peak power. Sprint speed. Jump height.

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These measurements establish capability.

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Long-term development, however, is not simply a sequence of higher test scores.

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Athletes move through changing training loads, competition demands, technical challenges, interruptions, recovery periods, and different stages of their careers.

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The developmental question therefore becomes broader:

• How does established performance behave as those demands change?

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A Developmental Continuum

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Within EVZ™, athlete development can be viewed through four interconnected priorities:

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Retention → Transfer → Output → Re-attainment

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Retention

• Establish stable, repeatable performance.

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Before continually increasing demand, athletes benefit from developing qualities that can be expressed with sufficient consistency.

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Transfer

• Carry established performance across changing demands.

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As athletes mature, the challenge becomes applying developed capacity across different loads, tasks, environments, and sport-specific constraints.

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Output

• Develop repeatable, higher performance.

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Greater strength, speed, or power remains important, but higher output becomes more useful when it can be integrated into an already stable developmental profile.

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Re-attainment

• Restore previously established performance.

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Development is rarely uninterrupted.

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Training phases change. Competition intervenes. Injuries, layoffs, reduced exposure, and changing priorities occur.

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The ability to return toward previously established performance is therefore part of long-term development—not simply an exception to it.

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Durability Is the Outcome, Not a Separate Stage

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Performance durability is not another phase added to athlete development.

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It is what emerges when performance becomes increasingly capable of being:

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• retained, transferred, developed, and re-attained over time.

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This perspective is useful across an athlete’s lifespan.

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Early in development, durability may mean consistently reproducing basic movement skills.

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Later, it may mean carrying physical gains into increasingly complex sport demands.

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At higher levels, it may mean sustaining high performance through demanding training and competition schedules.

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Beyond competitive sport, durability can mean maintaining meaningful strength, power, coordination, and physical capability as training exposure and age change.

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Why Longitudinal Evidence Matters

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Athletes rarely improve in a perfectly straight line.

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Performance may:

• improve → stabilize → fluctuate → decline → recover

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Training-load research and athlete-monitoring literature reinforce the importance of interpreting performance within context rather than relying on isolated measurements alone.

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The coaching challenge is not simply identifying that something changed.

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It is determining whether that change represents normal adaptation, a developmental opportunity, or a need to alter the current emphasis.

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Where EVZ Fits

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EVZ does not replace existing LTAD models.

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It adds a structured way to interpret how performance is developing within them.

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Evidence can come from:

• Observation | Technology | Hybrid

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RPI™ can provide a retention/repeatability signal where appropriate.

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EVZ Wave™ can examine how established performance behaves across changing demands and whether that performance can subsequently be re-attained.

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Longitudinal tracking then helps coaches determine whether the athlete’s developmental profile is actually changing over time.

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The objective is not simply more measurement.

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It is better developmental interpretation.

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The Bigger Idea

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Long-term athlete development should not only ask:

• How strong, fast, powerful, or skilled can this athlete become?

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It should also ask:

• How reliably can those qualities be retained, transferred, developed further, and restored across the athlete’s journey?

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Capability matters.

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So does what happens to that capability over time.

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That is the missing layer performance durability can add to long-term athlete development.

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References

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Allen, D. G., Lamb, G. D., & Westerblad, H. (2008). Skeletal muscle fatigue: Cellular mechanisms. Physiological Reviews, 88(1), 287–332.

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Bishop, D., Girard, O., & Mendez-Villanueva, A. (2011). Repeated-sprint ability—Part II: Recommendations for training. Sports Medicine, 41(9), 741–756.

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Impellizzeri, F. M., Marcora, S. M., & Coutts, A. J. (2019). Internal and external training load: 15 years on. International Journal of Sports Physiology and Performance, 14(2), 270–273.

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Maunder, E., Seiler, S., & Mildenhall, B. (2021). The durability of endurance performance: Physiological characteristics and implications. European Journal of Applied Physiology.

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McGuigan, M. R. (2017). Monitoring Training and Performance in Athletes. Human Kinetics.

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Seiler, S. (2010). What is best practice for training intensity and duration distribution in endurance athletes? International Journal of Sports Physiology and Performance, 5(3), 276–291.

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