2.3. Materials and Testing
LSS
For descriptive purposes, body height (cm), body mass (kg), and body fat (% body weight) were determined using a precision stadiometer and a weighing scale (SECA 222 and 634, respectively, SECA Corp., Hamburg, Germany). All measurements were taken with the participants wearing underwear. Body mass index (BMI) was calculated from the subjects’ body mass and height (kg·mThe spatiotemporal variables of GCT, flight time (FT), DF, SF, VO, and SL; MPO (in W), power output normalized to body mass (nMPO), and LSS was estimated with the Stryd running powermeter (Stryd powermeter, Stryd Inc., Boulder, CO, USA).Stryd is a carbon fiber-reinforced foot pod based on a 6-axis inertial motion sensor (3-axis gyroscope, 3-axis accelerometer), which has been shown reliable (CV ≤ 3%, ICC ≥ 0.95) [The additional load (i.e., +5% and +10% of body weight) was added by using a weighted vest. This has a series of pockets on the front and back where 300 g bags can be added, allowing accurate control of the additional load and an even distribution of the extra load.