Stretch Reflex
The stretch reflex is an involuntary muscle contraction in response to rapid stretching, exploited in plyometric exercises to generate more force.
Definition
A stretch reflex is a neural response to muscle stretch involving sensory input from muscle spindles and spinal and longer-latency pathways. Its size and timing depend on task, background activation and how the stretch is applied.
Limits and application
The laboratory tendon jerk is not identical to every response during voluntary movement. Stretch-reflex physiology alone does not prove that a drill improves power, prevents injury or transfers to HYROX®, and it does not justify one universal stretching or plyometric prescription.
FAQ
Is there one correct load or dose?
No. Select it from the goal, equipment, experience and response.
Does it guarantee HYROX® performance?
No. Training relevance does not establish individual race transfer.
What if it hurts?
Stop for sharp, persistent or worsening pain and seek qualified assessment.
Plyometric drills like depth jumps (stepping off a box and immediately jumping) specifically train the stretch reflex by requiring rapid eccentric-to-concentric transitions.[^3] Start with low box heights (20-30 cm) and progress gradually. Use Repz to compare wall ball and burpee broad jump station times before and after a plyometric training block to assess the impact.
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