How Does Power During Running Change when Measured at Different Time Intervals?

Abstract

This study aimed to examine how the power output changes while running at a continuous comfortable velocity on a motorized treadmill by comparing running power averaged during different time intervals. Forty-nine endurance runners performed a running protocol on a treadmill at self-selected comfortable velocity. Power output (W) was estimated with the Stryd™ power meter, and it was examined over six recording intervals within the 3-min recording period: 0–10 s, 0–20 s, 0–30 s, 0–60 s, 0–120 s and 0–180 s. The ANOVAs showed no significant differences in the magnitude of the power output between the recording intervals (p=0.276, F=1.614, partial Eta 2 =0.155). An almost perfect association was also observed in the magnitude of the power output between the recording intervals (ICC≥0.999). Bland-Altman plots revealed no heteroscedasticity of error for the power output in any of the between-intervals comparisons (r 2<0.1), although longer recording intervals yield smaller systematic bias, random errors, and narrower limits of agreement for power output. The results show that power data during running, as measured through the Stryd™ system, is a stable metric with negligible differences, in practical terms, between shorter (i. e., 10, 20, 30, 60 or 120 s) and longer recording intervals (i. e., 180 s).

Mechanical Power in Endurance Running: A Scoping Review on Sensors for Power Output Estimation during Running

“…Table 1 shows a summary of 12 studies using wearable sensors with the capacity of measuring power during different running exercises. Whereas three of those studies [ 11 , 27 , 28 ] examine the PW kinetics during different running protocols, the other four studies [ 15 , 25 , 26 , 29 ] investigate the relationship between PW and physiological parameters such as oxygen consumption (VO 2 ) at different intensities. Additionally, two further works [ 30 , 31 ] analyse the application of mathematical models, based on power laws, to predict running performance, whereas a recent study [ 32 ] assesses the agreement level between two mathematical models and five power meter devices through different running conditions.…”

“…Furthermore, the Stryd reliability for PW during treadmill running at a self-selected constant speed with a slope gradient at 0% was proved to be a stable data between short and long intervals (i.e., 10–120 s and 180 s, respectively) [ 28 ]. No significant differences were found in the amount of power production between the different spans of times acquired ( p = 0.276, partial ETA 2 = 0.155) and an almost perfect association in the previously mentioned amount of power production recorded over the intervals (ICC ≥ 0.999).…”

“…No significant differences were found in the amount of power production between the different spans of times acquired ( p = 0.276, partial ETA 2 = 0.155) and an almost perfect association in the previously mentioned amount of power production recorded over the intervals (ICC ≥ 0.999). As the authors mentioned, the conditions in which the study was performed may influence the stability of running power over time and these findings should not be taken for granted when transferred to over-ground running [ 28 ]. The findings reported here seem to be very advantageous for clinicians and practitioners since, if compared to other physiological parameters such as heart rate or VO 2 , PW tend to stabilise over time earlier than others traditionally used.…”

Estimating Functional Threshold Power in Endurance Running from Shorter Time Trials Using a 6-Axis Inertial Measurement Sensor

“…To compare 4 power meter devices in terms of repeatability and concurrent validity between P data and oxygen consumption (VO 2 ). [12] Stryd (foot pod)…”

Influence of the Shod Condition on Running Power Output: An Analysis in Recreationally Active Endurance Runners

“…While several studies have already analysed power output in running [18,19] and others have investigated the relation between VO2max and power production [16,20], to the best of the authors' knowledge, there are no studies assessing the difference in power output between shod and barefoot running. In order to bridge this gap, this study aims to identify the effect of footwear on power output in endurance runners.…”