Eight camera motion capture system

Participants ran at 4.0 m/s ± 5%, striking a piezoelectric force platform (Kistler, Kistler Instruments Ltd) with their right (dominant) foot. Running velocity was monitored using infrared timing gates (Newtest, Oy Finland). The stance phase was delineated as the duration over which >20 N vertical force was applied to the force platform. Runners completed five successful trials in each footwear condition in a counterbalanced manner. Kinematic data was captured at 250 Hz via an eight camera motion capture system (Qualisys Medical AB, Goteburg, Sweden).
Lower extremity segments were modelled in 6 degrees of freedom using the calibrated anatomical systems technique (Cappozzo et al., 1995 ). Lower extremity segments were delineated in accordance with those of Sinclair (2014) . Static calibration trials were obtained in each footwear allowing the anatomical markers to be referenced in relation to the tracking markers/ clusters.

Anthropometric data from one healthy male subject (age: 26, mass: 70 kg, height:
178 cm) were acquired in the current study with the aim of setting the
musculoskeletal modelling background. The subject was initially equipped with 20
reflective skin markers attached to the pelvis, trunk, shoulder and right arm. The
position of the reflective markers was recorded using an eight-camera motion capture
system (Qualisys AS, Gothenburg, Sweden) at a sampling frequency of 100 Hz.
Kinematic data were analysed using the AnyBody Modelling System 6.1 (AMS) (AnyBody
Technology, Aalborg, Denmark), and a static trial was conducted in neutral position
as reference to scale the model to the subject.