Specific Aim 1: Use the Force Shoes as a means to measure static loads on ARED.
Specific Aim 2: Use the Force Shoes to collect data during ARED exercises to aid in the ongoing evaluation of the Force Shoes to support Human Research Program (HRP) sponsored research.
Specific Aim 2a: Determine if the Force Shoes are suitable for intermittent or regular use during ARED exercise.
A minimum of two subjects (and up to four subjects) will be recruited for the hardware demonstration in order to collect two full static load data sets from 0 pounds to 500 pounds, perform selected ARED exercises, and complete the static load measures on the ISS second generation treadmill (T2).
1. Two subjects will perform one in-flight “calibration” session on T2, preferably prior to the subject’s first ARED Force Shoe Data Collection session. During the T2 session, two datasets of varying static loads configurations (preferably 2, 4, 6, 8, and 10 French clips) will be measured by the Force Shoes and the T2 force cells to correlate the measurements by a minimum of 2 subjects. During this session, the treadmill belt will be programmed to 0 mph and the subject will use the treadmill harness, bungees and French clips to provide a series of static load measurements on the treadmill per nominal operational procedures, adding clips and, thus, decreasing the pull-down load until the Force Shoes no longer contact the treadmill.
2. Up to four ARED sessions will be performed between by all subjects to collect two full datasets of static load measurements and dynamic exercise measurements. To complete each dataset, a crewmember will perform a series of load measurements from 0 pounds to 500 pounds on the ARED to obtain a sufficient number of data points in order to develop a load measurement characterization by the Force Shoes. During each ARED session, static and dynamic load data will be collected with the ARED in different configurations. A series of static loads will be collected with the ARED Main Exercise Bar in the low position, and a second series of static loads will be collected with the ARED Main Exercise Bar on the high position; static load data points will be collected in triplicate. Finally, dynamic load data will be collected by the subject performing two sets of three standard ARED exercises: squat, deadlift and bicep curl. The range of data collected per subject per session will be determined by the subjects’ ASCRS and the PI.
During flight, he subject will unstow hardware, install batteries, and configure hardware for warm-up. During warm-up, the subject will watch video, set up camcorder, and don the harness. After hardware warm-up is complete, the subject will perform the Force Shoes protocol using T2 and static loads will be adjusted by changing the bungee tension per current operational procedures by adding clips and reducing the pull-down load until the Force Shoes are not in contact with the treadmill belt. Measurements will simultaneously be recorded through the T2 force load cells and the Force Shoes software (Force Shoes data files are automatically saved to the SSC server or ASC by the software program). The T2 load cell measurement will be compared to that of the Force Shoes in an effort to validate the Force Shoes measurement. The subject will doff hardware and configure the Compact Flash (CF) card from the camcorder for downlinking. After downlinking is complete, the ground will direct the crew to delete video files per nominal procedure.
This study has concluded. Results will be available at a later date.