Procedures
Prior to testing, participants warmed up on a treadmill
(AlterG Anti-Gravity Treadmill PRO 200; AlterG Inc., Fremont,
CA, USA), and then the test speed was determined. This
was done by having participants self-select a running speed
that they felt could be maintained for 30 minutes. The treadmill
was set with no elevation gain, and the speed display was
hidden from view; no instructions were given to participants
regarding foot strike. Participants gave the researcher cues to
either increase or decrease speed until the desired speed was
reached. The self-selected speed was recorded, the treadmill
was stopped, and the process was repeated for a total of three
times. The test speed was the average of the three self-selected
speeds, with the group averaging 3.1 ± 0.6 m/s.