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Acute Oxygen Consumption Response to Fast Start High-Intensity Intermittent Exercise
Payton Miller1, Noah Perez1, John W Farrell1
1Clinical Biomechanics and Exercise Physiology Laboratory, Texas State University, San Marcos, TX 78666, USA.
Sports (Basel, Switzerland)
|December 22, 2023
Summary
High-intensity interval exercise (HIIE) oxygen consumption is similar between fast start and steady power protocols when matched for W
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- High-intensity interval exercise (HIIE) is effective for improving cardiorespiratory fitness.
- Understanding the oxygen consumption (VO2) response to different HIIE protocols is crucial for optimizing training.
- W' (work capacity above critical power) is a key determinant of exercise tolerance during intense efforts.
Purpose of the Study:
- To compare the acute oxygen consumption (VO2) response between two HIIE protocols: fast start (FSHIIE) and steady power (SPHIIE).
- To determine if matching HIIE protocols for W' (work capacity above critical power) depletion affects the VO2 response.
- To investigate the time spent above 90% of VO2max (PT ≥ 90% VO2max) during matched HIIE protocols.
Main Methods:
- Eight cyclists performed incremental max and 3-minute all-out tests to establish VO2max, critical power (CP), and W'.
- Two HIIE protocols (FSHIIE and SPHIIE) were administered, each with 3 x 4-minute intervals and 3-minute active recovery.
- Both protocols aimed to deplete 60% of W' (W'target), with SPHIIE depleting it consistently and FSHIIE depleting it rapidly within the first minute.
Main Results:
- No significant differences were found in the percentage of training time spent above 90% VO2max (PT ≥ 90% VO2max) between SPHIIE (25.20%) and FSHIIE (26.07%).
- Peak VO2 differed between the first, second, and third minutes of the intervals, but not between the second and third minutes.
- VO2 response during HIIE is comparable when protocols are matched for W' expenditure.
Conclusions:
- When high-intensity interval exercise (HIIE) protocols are matched for W' depletion, the time spent at very high oxygen consumption (VO2) levels is similar.
- The specific pattern of W' depletion within intervals does not alter the overall VO2max utilization during HIIE.
- These findings suggest flexibility in designing HIIE protocols without compromising the physiological stimulus, provided W' expenditure is matched.
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