Quantifying the effects of four weeks of low volume high intensity sprint interval training on VO2max through assessment of haemodynamics

Gordon, Dan and Swain, Patrick and Keiller, Don and Merzbach, Viviane and Gernigon, Marie and Chung, Henry (2020) Quantifying the effects of four weeks of low volume high intensity sprint interval training on VO2max through assessment of haemodynamics. Journal of Sports Medicine and Physical Fitness, 60 (1). pp. 53-61. ISSN 1827-1928

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Official URL: http://dx.doi.org/10.23736/S0022-4707.19.09912-2

Abstract

Background: Sprint interval training is a popular workout modality. Studies have eluded to a positive effect on maximal oxygen uptake, however little is known about the mechanistic basis of this adaptation. Therefore, the purpose of this study was to determine the effects of a short-term high-intensity sprint interval training (SIT) intervention on V ̇O2max through quantification of both the respiratory and haemodynamic responses. Participants: Thirty-seven physically active participants undertook 4-weeks of either cycling-based SIT (8 x 20 s at 170% P-V ̇O2max with 10 s recovery) or continuous exercise training (CET) (30 min at 70% P-V ̇O2max) 3 times per week. V ̇O2max, blood-based markers and haemodynamic responses were assessed pre and post the intervention period. V ̇O2max was assessed using breath-by-breath open circuit spirometry, while haemodynamic responses were monitored using thoracic impedance cardiography. Results: V ̇O2max exhibited a non-significant 4.1% increase (ES = 0.24) for SIT with 7.0% p = 0.007 (ES = 0.40) increase for CET. Haemodynamic responses (maximal cardiac output, maximal stroke volume) displayed non-significant responses for CET and SIT while a-vO2dif-max increased from 15.8 ± 4.8 to 18.3 ± 2.9 ml.100 ml-1) (p = 0.02) (ES = 0.63) in SIT. Conclusions: V ̇O2max is a function of maximal cardiac output and a-vO2dif-max, so for a meaningful change to occur in cardiorespiratory fitness, there must be a concomitant increase in O2 delivery. This study demonstrates that a low volume SIT intervention evokes peripherally mediated responses (a-vO2dif) and anaerobic substrate utilisation rather than O2 delivery components. Future works should address the time course of the responses and when assessing V ̇O2max-based responses that due attention be given to the haemodynamic responses as means of quantification of the response.

Item Type: Journal Article
Keywords: high intensity training, VO2max, haemodynamics, maximal oxygen uptake, cardiac output, high intensity training, anaerobic capacity
Faculty: Faculty of Science & Engineering
SWORD Depositor: Symplectic User
Depositing User: Symplectic User
Date Deposited: 12 Nov 2019 11:35
Last Modified: 03 Feb 2020 12:08
URI: http://arro.anglia.ac.uk/id/eprint/704956

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