Skyfarer: a mixed reality shoulder exercise game

Skyfarer is a mixed reality shoulder exercise game developed for prevention and treatment of shoulder pain for individuals aging with spinal cord injury. We are adapting a shoulder exercise protocol that has been evaluated in a randomized clinical trial [Mulroy et al. 2011]. This demonstration will showcase a second-generation integrated exercise hardware and software system. The system consists of an adjustable metal rig outfitted with GameTrak sensors that are attached to interchangeable Thera-Bands and free weights. The rig can accommodate individuals with various types of manual wheelchairs and can be adjusted for arm length. The GameTrak sensors provide three-dimensional movement data to the calibration and exercise software application that was developed in Unity Engine 3.5.

Skyfarer has emerged after iterating numerous prototypes that incorporated individual elements of a shoulder exercise protocol using a first-generation metal rig [Gotsis et al. 2012]. Skyfarer requires calibration of the game to the physical dimensions and muscle strength of individual players. Player profiles can be stored and the number of required repetitions per exercise can be manually adjusted before playing.

Skyfarer 0.5a incorporates the following parts of the exercise protocol: external rotation, rowing, diagonal pull-down and vertical lift exercises. This version has been evaluated in a biomechanical study conducted at Rancho Los Amigos National Rehabilitation Center. The virtual environment immerses players into an adventure inspired by Pre-Colombian mythology inspired by the landscapes of South America. With each exercise, players prepare, propel and lift their vessel into water or air, collecting energy that can be used during breaks between exercise sets. Skyfarer 0.5b includes Microsoft Kinect as input for free-form movement segments of the game, such as drawing and improved calibration, animation and movement cuing.