Fig 1.
Hypothetical models to evaluate the effect of speed on the relation between stride frequency and heart rate.
The dashed line (V90%), dash-dot (V100%) and solid line (V110%) respectively represent three increasing speed conditions.
Table 1.
Significance of the model parameters.
Fig 2.
The relation between SF and HR for each speed series based on Model 1.
From bottom to top V90%, V100%, V110%. The central line in the boxplot represents the median, the edges of the box are the 25th and 75th percentiles, and the whiskers extend to ±1.5 of the interquartile range. The outliers (+) beyond this range belong to a single participant. An optimum of 83 strides·min-1 was calculated using the parameters of Model 1.
Fig 3.
Average error scores calculated from the observed stride frequency (SF) relative to the imposed SF.
The asterisk denotes the average self-selected SF.