If the cables aren't a problem then you could use Phidgets with the following parts:
● MOT1101_0 - Spatial Phidget
x2 or x3
● HUB0000_0 - VINT Hub Phidget
● Phidget Cable
x2 or x3
● Mini-USB Cable
You would attach one MOT1101 to each hand, or whatever other points you would want to monitor the movement of. You could take the board out of the enclosure if you wanted it to be less bulky on the hands. Then the Phidget cables would run through the sleeves and out the back, where they would connect to the VINT Hub, which is the board that gathers and sends all of the data to your computer. Since this is a test environment, you could probably have a laptop computer on a nearby table to plug the VINT hub into. Then you would start your program and begin collecting data.
You'll need to know at least a little bit of programming to use Phidgets- or know someone who can write you a quick program. Probably all you'd need to do is modify our examples to output the data to a spreadsheet where you can process it later.
The difference between our Accelerometer Phidget and our Spatial Phidget is that the former has a 3-axis accelerometer, and the latter has a 3-axis accelerometer, gyroscope, and magnetometer. If you have the proper math, these extra two sensors will help paint a better picture of what movement is happening.