Limb kinematics
A high-speed video camera (Casio Exilim Pro Ex-F1) recorded sagittal plane images at 100 Hz during the final 10 seconds of each 10-minute submaximal running bout.
The 10-second video recordings were then downloaded and digitized using motion analysis software (Quintec Biomechanics 9.03 v14).
SL and SF during each running bout were determined from the method previously used by Braun and Dutto18 and
Chen et al.17 SL was calculated using the following formula: SL (m) ¼ velocity (m/s)/stride time (seconds).
SF was calculated as the number of full strides divided by the time between the first and last heel contacts