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Annual Meeting Abstracts: C-35 – Free Communication/Poster: Respiratory and Acid-Base

Cardiopulmonary Requirements During Eccentric than Concentric Resistance Training When Performed at the Same Intensity

Vallejo, Alberto F.; Schroeder, E. Todd; Hawkins, Steve A.; Sattler, Fred R.

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Medicine & Science in Sports & Exercise: May 2004 - Volume 36 - Issue 5 - p S127
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It is known that eccentric contractions demonstrate lower electromyographic activation than concentric contractions at the same absolute workload. However, the energy cost of performing eccentric versus concentric contractions during a bout of resistance training (RT) have not been quantified. Lower cardiopulmonary requirements associated with eccentric RT may have implications for rehabilitation in populations with extreme weakness and or poor muscular endurance. PURPOSE: To determine the cardiopulmonary requirements of eccentric versus concentric contractions during a bout of resistance training in young men and women. METHODS: Seven (2 men; 5 women) volunteers, 21–30 years of age participated in the study. The subjects performed leg extension and leg flexion exercises on a KinCom dynamometer at 60°s and bi-lateral full squat exercises in a modified smith rack (adapted for eccentric or concentric only exercises). The protocol consisted of 3 sets of 10 repetitions at 65% of the concentric 1-repetition maximum strength for each exercise with 30 second (leg ext/flex) and 2 minute (squats) rest periods between sets. Cardiopulmonary parameters including VO2, VCO2, and heart rate were measured 5 min. before, during, and 5 min. post exercise using a metabolic cart. RESULTS: Eccentric RT resulted in VO2, VCO2, and heart rate measures that were significantly lower than during concentric RT. The table below shows a portion of the metabolic and cardiopulmonary data collected during the squat exercise. *Significantly different from Concentric RT, P<0.004 CONCLUSION: Our data suggests that a bout of eccentric resistance training can be performed with lower cardiopulmonary requirements compared to a bout of concentric resistance training at the same intensity.

©2004The American College of Sports Medicine