Wearable Assessment of Level and Uphill Running at Critical Intensity
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Purpose
We used commercially available wearable devices that measure running power (foot-vs. wrist-based) and muscle oxygenation to investigate time-to-exhaustion during level and uphill running at critical intensity.
Methods
14 healthy recreational runners participated in this study. They first ran a 3-minute all-out test to derive their critical running intensity. They then performed two time-to-exhaustion trials (TTEs) at this intensity at separate slopes to assess time-to-exhaustion, muscle oxygenation, and rating of perceived exertion.
Results
We observed a shorter time-to-exhaustion (539 ± 160 vs. 936 ± 336 s), a faster decline in muscle oxygenation over time (−2.48 ± 1.32 vs. -1.62 ± 2.11 %·min -1 ), a higher rating of perceived exertion at matched time points, and a higher estimated metabolic rate (19.51 ± 1.99 vs. 17.82 ± 1.62 W·kg -1 ) for the level time-to-exhaustion test (TTE Level ) compared to the uphill time-to-exhaustion test (TTE Incline ) at a 2.86° (5%) slope.
Conclusion
Our data suggests that athletes should be careful when using running power at critical intensity to guide their racing and training in non-level conditions.
