Abstract
Purpose: The aim of the present study was to compare the contributions of the anaerobic pathway as determined by two different methods and energy expenditure during a typical high-intensity intermittent exercise (HIIE) protocol.Methods: A descriptive research design was utilized in which thirteen physically active men performed six experimental sessions consisting of an incremental test (session 1), submaximal tests at 40, 50, 60, 70, 75, 80, 85, 90% of velocity associated with maximum oxygen uptake (vO2max) with two intensities per session (sessions 2–5), and the HIIE protocol (session 6; 10 efforts of 1 min at vO2max interspersed by 1 min of passive recovery). The estimation of anaerobic energy system contribution was calculated by: (a) the excess post-exercise oxygen consumption plus delta lactate method and (b) the accumulated oxygen deficit method using the difference between predicted oxygen demand from the submaximal tests of varying intensities and accumulated oxygen uptake during HIIE. Estimation of aerobic energy system contribution was calculated through the measurement of oxygen consumption during activity. Total EE during the entire HIIE protocol (efforts + recovery) and for the efforts only were calculated from each method.Results: For efforts + recovery and efforts only, anaerobic contribution was similar for both methods, and consequently total EE was also equivalent (p = 0.230 for both comparisons). During efforts + recovery, aerobic:anaerobic energy system contribution was (68 ± 4%: 32 ± 4%), while efforts only was (54 ± 5%: 46 ± 5%) with both situations demonstrating greater aerobic than anaerobic contribution (p < 0.001 for both).Conclusion: Anaerobic contribution seems to be relevant during HIIE and must to be taken into account during total EE estimation; however, the type of method employed did not change the anaerobic contribution or total EE estimates.
Highlights
High-intensity intermittent training is considered an efficient strategy to control or decrease fat mass (Trapp et al, 2008; Panissa et al, 2016) that may be superior to moderate-intensity continuous training
During sessions 2–5, the participants were submitted to submaximal intensities with 7 min of duration at each velocity (40, 50, 60, 70, 75, 80, 85, 90% of velocity corresponding to V O2max [vV O2max]) exercising at two intensities per session separated by 30 min of recovery, which used to estimate EE, and during session 6, they completed the highintensity intermittent exercise (HIIE) protocol (Figure 1)
From the two way analysis of variance, main effects for energy system contribution were found for the efforts + recovery when examining the absolute values (F1,12 = 187.7; p < 0.001; η2p = 0.918 [large]) and the percentage values (F1,12 = 219.81; p < 0.001; η2p = 0.948 [large]) with aerobic contribution being greater than anaerobic contribution in both cases
Summary
High-intensity intermittent training is considered an efficient strategy to control or decrease fat mass (Trapp et al, 2008; Panissa et al, 2016) that may be superior to moderate-intensity continuous training. The superior benefits of high-intensity intermittent training over moderate-intensity continuous training have included protocols matched for energy expenditure (EE) (Trapp et al, 2008) or mechanical work (Higgins et al, 2016), and even when high-intensity intermittent training is performed with lower volume (Tremblay et al, 1994). As EE is an important variable to consider from a weight management perspective (Keating et al, 2017), longitudinal studies aiming to investigate fat mass reduction during highintensity intermittent training have used oxygen uptake to estimate EE (Tjønna et al, 2008; Trapp et al, 2008; Hwang et al, 2016; Kong et al, 2016). If only the oxygen uptake measurement is considered to match EE between high- and moderate-intensity protocols, the results could be biased
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