WM Silvers


W. M. Silvers

Whitworth University, Spokane, WA

While many benefits have been ascribed to high-intensity exercise (HIE), some modes such as sprint running and burpees involve large ground reaction forces, which may increase injury risk or joint pain. A new mode of exercise that involves quadrupedal movements performed on a set of resistance rails introduces a novel opportunity to perform HIE with reduced GRFs. PURPOSE: The aim of this study was to compare cardiorespiratory and metabolic responses for three quadrupedal resistance rail exercises. METHODS: Fifteen healthy, moderately active participants (nmale = 9, nfemale = 6; 21.5 ± 1.7 y, 171.7 ± ± 5.31 cm, 69.8 ± 12.7 kg) volunteered for participation. A familiarization session was used to instruct participants how to perform three quadrupedal movements on the resistance rails: mountain climbers (MC), spidermans (SP), and beast mode (BM). In a separate testing session, participants performed continuous 5 min bouts of exercise for each of the three movements at self-selected intensities, separated by 10 min of active recovery. During each bout, metabolic and cardiorespiratory data were recorded with a chest strap heart rate monitor, metabolic cart, and blood lactate analyzer. A repeated measures ANOVA was used to compare mean data for each dependent variable between movements. RESULTS: Oxygen consumption (MC: 24.76 ± 6.02 ml/kg/min, SP: 24.94 ± 5.11 ml/kg/min, BM: 24.70 ± 4.99 ml/kg/min, p = 0.99) and heart rate (MC: 154.7 ± 18.2 bpm, SP: 166.1 ± 12.8 bpm, BM: 166.8 ± 10.8 bpm, p = 0.232) were not different between movements. Conversely, delta lactate, calculated as the difference between resting and post-bout levels (MC: 7.0 ± 0.6 mmol/L, SP: 7.9 ± 0.7 mmol/L, BM: 8.9 ± 1.1 mmol/L, p = 0.002), and total energy expenditure (TEE), estimated as the sum of aerobic and anaerobic expenditure (MC: 18.5 ± 2.6 kcal/min, SP: 22.1 ± 3.6 kcal/min, BM: 24.4 ± 3.0 kcal/min, p = 0.008), were significantly different between movements. CONCLUSION: All quadrupedal movements performed on the resistance rails elicited heart rates at least 78% of age-predicted maximum, which demonstrates feasibility of this mode as a HIE option. In addition, the anaerobic contribution of energy expenditure disproportionately increased from MC to SP to BM, which may explain why VO2 measurements were similar across movements, yet TEE was different.

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