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Abstract

International Journal of Exercise Science 10(3): 312-321, 2017. The purpose of this study was to examine the variation in oxidative, glycolytic, and post-exercise O2 kinetic contribution during two distinct high-intensity interval training (HIIT) protocols using a 1:1 work-to-rest ratio (30:30 sec) and a 2:1 work-to-rest ratio (30:15 sec). HIIT familiarized males (n =6) and females (n = 8) were recruited for this study. All subject underwent 3 testing session, an incremental maximal exertion treadmill test and 30:30 and 30:15 HIIT protocols in a counterbalanced order. Each HIIT protocol measured oxygen consumption (VO2), carbon dioxide production (VCO2), and respiratory exchange ratio (RER) to represent oxidative contribution. Capillary blood lactate was also analyzed to represent glycolytic contribution during both HIIT sessions. Repeated-measures ANOVA revealed a relative and absolute significant difference between the oxidative, glycolytic, and post-exercise oxygen kinetics between 30:30 and 30:15 HIIT session. 30:30 displayed a greater contribution from the oxidative system while the 30:15 displayed an increase contribution from the glycolytic system and displayed an increase in EE during the post-exercise oxygen kinetics phase. Results also revealed no significant findings between the two HIIT sessions in regards to absolute EE (30:30 = 258.2 + 43 kcals, 30:15 = 261 + 43.6 kcals). The addition of blood lactate following exercise did display a noteworthy contribution from the glycolytic system. In conclusion, utilizing pulmonary gas exchange in conjunction with blood lactate depicts an acceptable EE estimation during a bout of HIIT.

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