Is Stryd critical power a meaningful parameter for runners?

Area of Science:

• Exercise Physiology
• Sports Technology
• Running Biomechanics

Background:

• Running power estimation is crucial for training optimization.
• Stryd is a wearable device that measures running power.
• Critical Power (CP) is a key physiological metric for endurance performance.

Purpose of the Study:

• To evaluate the effectiveness of Stryd's website-generated Critical Power (CPSTRYD) for runners.
• To determine the relationship between CPSTRYD and established physiological markers and running performance.
• To assess the predictive validity of Stryd's ground contact time (GCT) for performance.

Main Methods:

• Twenty runners trained with Stryd for at least six weeks to establish CPSTRYD.
• Laboratory graded exercise tests and outdoor 1500m/5000m time trials were conducted.
• CPSTRYD was compared to second ventilatory threshold (VT2) and onset of blood lactate accumulation (OBLA).

Main Results:

• CPSTRYD closely aligned with VT2 and OBLA, demonstrating physiological relevance.
• CPSTRYD proved highly predictive of running performance across various distances.
• Stryd's GCT was a significant predictor of performance at submaximal treadmill speeds.

Conclusions:

• Stryd's CP estimation is a meaningful and realistic metric for runners.
• CPSTRYD is comparable to established CP models derived from laboratory testing.
• Coaches and runners should consider potential variances in CP estimation methods.