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Official Journal of the American College of Sports Medicine There were no significant differences between actual steps taken and Yamax and Omron recorded steps (p>0.05). In addition, there were no significant differences between actual distance traveled and Yamax and Omron recorded distance (p>0.05). However, the BCF pedometer significantly underestimated step count (p
<strong>Thursday</strong>, May 30, 2013 S276 Vol. 45 No. 5 Supplement group. However, given the line equation between HR and PR in subjects with SPAH is significantly different compared to NPAH and MPAH, using PR in predicting HR may be inaccurate and misleading. This puts into question the utility of PR in predicting actual HR. To monitor intensity of exercise, HR should be measured by electrocardiography during the 6 minute walk test. 1441 Board #33 May 30, 3:30 PM - 5:00 PM Characterization of the Ventilatory drive in Patients with Pulmonary hypertension and Interstitial Lung disease Lisa M. K. Chin1 , Randall E. Keyser, FACSM2 , Joshua G. Woolstenhulme1 , Bart Drinkard1 , Gerilynn Connors3 , Steven D. Nathan3 , Leighton Chan1 . 1National Institutes of Health, Bethesda, MD. 2George Mason University, Fairfax, VA. 3Inova Fairfax Hospital, Falls Church, VA. (No relationships reported) Pulmonary hypertension (PH) and interstitial lung disease (ILD) are conditions that may develop without a known cause (idiopathic) or in association with other etiologies such as connective tissue disease. Both conditions result in exercise intolerance, yet the pathomechanisms by which these conditions limit cardiorespiratory function are likely different. PurPOsE: To characterize differences in pulmonary respiration and/or ventilatory function that may limit cardiorespiratory capacity among patients with PH and ILD. METhOds: Six patients with idiopathic PH (iPH), 20 patients with associative PH (aPH), 16 patients with ILD, and 14 healthy controls (HC) completed a symptomlimited treadmill cardiopulmonary exercise test (CPET) as part of the NIH Exercise Therapy for Advanced Lung Disease Trial. Patients with right or left heart failure or PH that was co-morbid with ILD were not included. Pulmonary gas exchange was measured breath-by-breath. Variables of interest included peak oxygen consumption (VO ), expired carbon dioxide volume (VCO ), expired ventilatory volume (Ve), tidal 2 2 volume (Vt), breathing frequency (f), ventilatory equivalent ratio for carbon dioxide (Ve/VCO ) and end tidal partial pressure of CO (PETCO ). 2 2 2 rEsuLTs:Age and BMI (52 ± 11 yrs; 30.7 ± 6.8 kg/m2 ) were similar across all groups. Diminished (P < 0.05) peak VO , VCO , Ve and Vt were observed in patients 2 2 with iPH, aPH and ILD compared to HC. Peak f was higher (P
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