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Why Peak Testing Doesn’t Tell the Whole Story: A Golf Case Study

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Peak testing is an essential part of athletic evaluation.

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It tells us how much force, velocity, or power an athlete can produce under ideal conditions.

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But peak performance answers only one question.

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What can this athlete produce?

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It does not answer another equally important question:

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How well can they reproduce it?

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That distinction became clear while evaluating a professional golfer using the Evans Velo Zone™ methodology.

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A Different Kind of Performance Profile

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The golfer demonstrated excellent physical capacity.

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His club head speed averaged 118 mph, with a maximum speed of 124 mph.

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Traditional testing suggested a highly capable athlete.

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Peak outputs across multiple movement patterns appeared well balanced.

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At first glance, there was little reason to expect a performance limitation.

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Repeated-performance analysis told a different story.

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Looking Beyond Peak Output

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Rather than evaluating only the highest output in each movement pattern, repeated exposures were examined across several directions of force production.

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These included:

• Vertical
• Horizontal
• Rotational
• Lateral

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Most movement patterns demonstrated stable performance across repeated efforts.

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Lateral output did not.

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Although the athlete produced strong initial lateral performance, that output became less consistent when the movement was repeated.

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The limitation was not capacity.

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It was retention.

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Why That Matters in Golf

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Golf is commonly described as a rotational sport.

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In reality, efficient rotation depends on much more than rotational speed.

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The golf swing requires athletes to:

• Shift force laterally
• Stabilize through the lead side
• Decelerate efficiently
• Reproduce high-quality movement throughout an entire round

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If lateral output deteriorates across repeated swings, the athlete may experience:

• Less consistent ground-force interaction
• Reduced movement efficiency
• Greater technical variability
• Difficulty maintaining performance late in competition

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These changes may not appear during peak testing.

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They often become visible only when performance is evaluated across repeated exposures.

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The Missing Layer

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Traditional testing remains extremely valuable.

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It identifies an athlete’s capacity.

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Repeated-performance analysis explains how that capacity behaves.

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Both perspectives matter.

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One tells coaches what is possible.

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The other tells them what is dependable.

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Measuring Directional Performance

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Within the EVZ methodology, repeated performance is evaluated using the Retainable Power Index (RPI™).

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RPI can be applied across different movement patterns to compare how well performance is retained in each direction.

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Instead of asking:

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“Which direction produces the greatest output?”

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Coaches can also ask:

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“Which direction maintains its output most effectively?”

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This provides a far more complete understanding of athletic performance.

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Coaching Implications

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Once the lateral retention deficit became apparent, programming shifted away from increasing maximum output.

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Instead, training emphasized:

• Repeated lateral force production
• Consistent movement quality
• Stability under repeated demand
• Improved retention across successive exposures

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The objective was not producing higher peaks.

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The objective was making existing performance more reliable.

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A Broader Coaching Principle

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This case illustrates an important lesson.

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Two athletes may demonstrate nearly identical peak testing results.

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Yet their repeated-performance profiles may differ substantially.

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One athlete consistently reproduces high-quality output.

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The other experiences progressive decline.

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Traditional testing identifies their similarities.

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Repeated-performance analysis reveals their differences.

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The EVZ Perspective

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Peak performance should never be ignored.

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But it should not stand alone.

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Understanding how performance behaves across repeated exposures provides coaches with another layer of information that isolated testing cannot offer.

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Within the EVZ methodology, this information supports:

• More individualized programming
• Better fatigue management
• Improved performance durability
• More informed coaching decisions

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Ultimately, the goal is not simply producing exceptional output.

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It is producing output that remains available throughout competition.

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Because in sport, athletes are rarely judged by what they can produce once.

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They are judged by what they can repeatedly sustain.