Author

Casey Austin

Date of Award

5-2018

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Kinesiology

First Advisor

James Hokanson, Ph.D.

Second Advisor

Peter M. McGinnis, Ph.D.

Third Advisor

Steve Patrick, M.S.

Abstract

A novel running wearable called the Stryd Summit footpod attaches to a runner’s right or left shoe and measures running power output. The developers of the product purport that the footpod’s power and form power measures may correlate with metabolic data gathered in a lab. PURPOSE: Explore the relationship between power output and running economy at threshold pace. METHODS: Seventeen well-trained distance runners, 9 males and 8 females, completed a running protocol at threshold pace. Participants ran two discontinuous four-minute stages: one with their self-selected cadence (SS), and one with cadence lowered by 10% (LC). Metabolic data, power, and form power output were recorded for each cadence condition. RESULTS: Average self-selected cadence was 179.60 strides·min-1 (±8.43), while lowered cadence was 172.54 strides·min-1 (±9.46). Average change in cadence from SS to LC was 3.93%. The average running economy expressed in terms of oxygen cost (±SD) at self-selected cadence was 201.58 ml·kg-1·km-1 (±12.80), and at lowered cadence was 204.48 ml·kg-1·km-1 (±11.48). Average caloric unit cost at SS was 1.05 kcal·kg-1·km-1 (±0.07), and at LC was 1.06 kcal·kg-1·km-1 (±0.06). Average power at SS was 4.37 W·kg-1 (±0.48), and at LC was 4.42 W·kg-1 (±0.49). Average form power at SS was 1.07 W·kg-1 (±0.09), and at LC was 1.13 W·kg-1 (±0.10). CONCLUSIONS: The present findings show that measures of running economy expressed in terms of oxygen cost and caloric unit cost are positively correlated with Stryd’s power and form power measures.

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