Study Protocol After determining eligibility, baseline ROM and PPT scores were taken by one blinded rater, and subjects completed an NPRS. The mobilization group was treated with non-thrust transverse vertebral pressures as described by Maitland. The patient lay prone with arms to the side and in a "forehead rest position". Pressures were applied to spinal levels T1 through T4. The spinous process of T1 was identified by first locating C6 using the cervical extension method17 and then counting caudally. The researcher stood at the level of the vertebra to be mobilized on one side of the subject. The pad of the researcher's non-dominant thumb was placed in contact with the lateral aspect of the spinous process of T1, while the dominant thumb was placed on the dorsal side of the other thumb. Pressure was applied to the spinous process to produce small amplitude, low velocity oscillation into resistance to the end-range of the vertebra (Grades IV to IV+). This procedure was performed for 30 seconds, then sequentially applied to the next caudal level through T4. The same pattern of application was used on the subject's contralateral side. The entire procedure was repeated once again for a total of 8 minutes. This was followed by a repeat of the outcome measurements. The control group received no treatment. Each control subject assumed the same prone position for 8 minutes as was used with the mobilization group and outcome measurements were repeated. The researcher performing the outcome measurements was blinded to group assignment. All subjects were clothed such that no localized residual evidence of thoracic manual contact was visible.