Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2022) 21, 545 - 554   DOI: https://doi.org/10.52082/jssm.2022.545

Research article
The Effects of a Single Session of High Intensity Functional Training on Energy Expenditure, VO2, and Blood Lactate
Leslie E. Smith1, , Gary P. Van Guilder1, Lance C. Dalleck1, Nigel K. Harris2
Author Information
1 Department of Recreation, Exercise and Sport Science, Western Colorado University, Gunnison, CO, USA
2 Human Potential Centre, Auckland University of Technology, Auckland, New Zealand

Leslie E. Smith
✉ Department of Recreation, Exercise and Sport Science, Western Colorado University, Gunnison, CO, USA
Email: lesmith@western.edu
Publish Date
Received: 08-07-2022
Accepted: 09-10-2022
Published (online): 01-12-2022
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ABSTRACT

High intensity functional training (HIFT) provides a potential option to meet public exercise recommendations for both cardiorespiratory and strength outcomes in a time efficient manner. To better understand the potential for HIFT as an exercise approach, energy expenditure (EE) and relative intensity need quantifying. In thirteen sedentary men and women with metabolic syndrome (MetS), we used both indirect calorimetry and blood lactate levels to calculate EE of a single session of HIFT. The HIFT session included four, 6-minute sets of consecutive functional exercises. Examples of the exercises involved were squats, deadlifts, suspension rows, suspension chest press, and planks. Intensity is described relative to individual ventilatory thresholds. The total group EE was 270.3 ± 77.3 kcal with approximately 5% attributed anaerobic energy production. VO2 ranged between 88.8 ± 12.3% and 99 ± 12% of the second ventilatory threshold (VT2), indicating a vigorous effort. After each work interval, peak blood lactate ranged between 7.9 ± 1.9 and 9.3 ± 2.9 mmol, and rate of perceived exertion between 6.9 ± 1.0 and 8.7 ± 0.8 arbitrary units from 1-10. These were achieved in approximately 46 minutes of exercise per participant. In conclusion, HIFT elicits the energy expenditure and effort requisite to result in the adaptive responses to produce the known suite of benefits of exercise for individuals with MetS.

Key words: Acute exercise, ventilatory threshold, metabolic syndrome


           Key Points
  • Mean energy expenditure for a 46-minute session of high intensity functional training was 270 kcal.
  • VO2 during the work intervals fell at or very near to the second ventilatory threshold indicating a vigorous effort.
  • Peak blood lactate ranged between 7.9 and 9.3 mmol, contributing to approximately 5% of total energy expenditure.
 
 
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