- Previous Studies of the PT system
- Tested the effects of a PT system on posture and discomfort (Rudakewych et al., 1994)
- Research Design: no control group
- Subjects received specialized training on the use of the PT system
- Results: PT system improved posture and reduced discomfort in the neck, back, arms and hands
- Limitations: Threats to validity due to history and maturation. Training versus design.