Medicine & Science in Sports & Exercise:
D-28 Free Communication/Poster - Fitness Testing: MAY 28, 2009 1:00 PM - 6:00 PM ROOM: Hall 4F
UNC Charlotte, Charlotte, NC.
(No relationships reported)
PURPOSE: Elliptical cross-trainers (ECT) have become an increasingly popular exercise modality within the fitness industry. Cybex International, Inc. has recently manufactured a new exercise modality, the Cybex® Arc Trainer (ARC), that utilizes a low impact mechanical design. To determine differences in physiological responses and perceived discomfort during maximal and submaximal exercise with two common exercise modalities, the ECT and the ARC which undergoes an excursion of motion utilizing an arc pathway.
METHODS: Eighteen subjects (10 male and 8 female; age=24.7±2.6 yrs, ht=172.2±10.3 cm, mass=69.8±14.9 kg, %fat=22.5±8.1%; mean±SD) performed maximal exercise protocols on a treadmill (TML), the ECT, and ARC. Subjects also performed three 10-minute submaximal exercise bouts on the ECT and ARC at 55%, 65%, and 75% of TML VO2max where HR, VO2, VE, RER, hip, knee and low-back discomfort were monitored using a 1 - 10 scale, 1 indicating no pain and 10 suggesting extreme pain. All ECT and ARC tests were performed in a counterbalanced order.
RESULTS: VO2max was greater during TML exercise compared to ECT (P=0.007), but similar to the ARC. Both ECT and ARC elicited lower HRmax values compared to maximal TML exercise (P=0.0001). No difference was observed between ECT and ARC for VO2 during the submaximal exercise bouts (P>0.05). However, HR was greater during submaximal ECT exercise (P>0.05). Perception of discomfort was not different between ECT and ARC for knees (P>0.05) and lower back (P>0.05), but different for the hips (P=0.02).
CONCLUSIONS: Similar VO2max values were observed with ARC and TML modalities. Greater perceptions of discomfort were observed with ECT compared to ARC at similar submaximal exercise intensities suggesting individuals with, or at risk for, lower extremity joint pathology may benefit from exercise with modalities other than the ECT.
Equipment was provided by Cybex International, Inc.