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Joshua M. Cortis1, Joshua E. Kneff1, Adam P. Grosskreutz1, Katelyn E. James1, Brian S. Snyder1. 1Truman State University, Kirksville, Missouri; e-mail: jmc1885@truman.edu

Sedentary behavior is prevalent in the population contributing to adverse health outcomes, thus it is important for individuals to engage in exercises they enjoy and which optimize their adherence to exercise recommendations. Knowledge regarding the metabolic response of differing exercise modalities can help users decide their best option. PURPOSE: The purpose of this study was to compare the oxygen cost, energy expenditure, and heart rate of treadmill running (TM), indoor rowing (R), burpees (B), and weighted sled pulls (S) at different exertion levels. METHODS: Twelve recreationally active males (Age 20.7 ± 1.8 years, WT 84.9 ± 11.8 kg, Body Comp 18.9 ± 4.3 % fat, VO2peak 55.7 ± 4.5 ml/kg/min) were recruited to participate in the study using a randomized, counterbalanced, crossover design, using a Latin-square. Participants first completed a VO2peak test to determine maximal aerobic capacity followed by familiarization to each modality until participants were sufficiently familiar with the exercise. Each participant then performed three exercise work rates in succession for each modality with 72 hours between modalities. Work rates one and two consisted of 7 minutes at an RPE of 11 or 14 with 3 minutes of rest between. Final work rate commenced after 6 minutes of rest burning 130 calories as quickly as possible. Oxygen uptake, energy expenditure, and heart rate were measured. RESULTS: Steady state oxygen cost was achieved at RPE 11 and 14. At RPE 11, there was no significant difference of modality on average oxygen cost or energy expenditure but HR was significantly different. At RPE 14, there was no significant difference of modality on average oxygen cost, HR, or energy expenditure. Treadmill running was numerically the fastest to burn 130 calories and resulted in the highest oxygen cost and was significantly different than other modalities. Time: [TM 7min 10.9s ± 55.5s, R 7min 42.9s ± 44.6s, B 7min 31.3s ± 30.1s, S 8min 46.2s ± 55.2s ] Oxygen cost: [TM 3.82± 0.57 , R 3.45± 0.35 , B 3.50± 0.32, S 3.06 ± 0.28]. CONCLUSION: Exercise modalities in this study were equivocal at lower RPEs but deviate in metabolic cost at maximal intensities.

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