Deep pressure pain thresholds: Deep pressure pain thresholds will be determined with a pressure algometer (Wagner Instruments, Greenwich, CT) which is a hand held device with a 1cm2 rub¬ber tip capable of measuring applied pressures of 0-5 kg. The device is held at a 90o angle to the body surface being tested. The pressure is gradually increased by 1 kg/second until the subject reports that the stimulus is painful or a pressure of 4 kg/cm2 has been reached. In the upper extremity thresholds to pain will be determined at: 1)second costosternal joint; 2) acromioclavicular joint; 3) lateral epicondyle; 4) radial styloid; 5) ulnar styloid; 6) second metacarpal; 6) fifth metacarpal. In the lower extremity thresholds to pain will be determined at: 1) greater trochanter; 2) lateral femoral condyle; 3) tibial tubercle; 4) mid shin; 5) medial malleolus; 6) lateral malleolus; 7) first metatarsal; 8) fifth metatarsal.