Acute Oxygen Consumption Response to Fast Start High-Intensity Intermittent Exercise

• Published in: Sports (Basel) Vol. 11; no. 12; p. 238
• Main Authors: Miller, Payton, Perez, Noah, Farrell, 3rd, John W
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.12.2023; MDPI
• Subjects: Blood; Cardiovascular disease; Consent; critical power; cycling; Exercise intensity; Fatigue; Fitness training programs; Heart rate; high-intensity intermittent exercise; Oxygen consumption; Physical fitness; Physiological aspects; Physiology; W prime; United States; United States > US; Finland; critical power; cycling; high-intensity intermittent exercise; W prime
• ISSN: 2075-4663; 2075-4663
• DOI: 10.3390/sports11120238

The current investigation compared the acute oxygen consumption (VO ) response of two high-intensity interval exercises (HIIE), fast start (FSHIIE), and steady power (SPHIIE), which matched w prime (W') depletion. Eight cyclists completed an incremental max test and a three-minute all-out test (3MT) to determine maximal oxygen consumption (VO ), critical power (CP), and W'. HIIE sessions consisted of 3 X 4 min intervals interspersed by 3 min of active recovery, with W' depleted by 60% (W'target) within each working interval. SPHIIE depleted the W'target consistently throughout the 3 min intervals, while FSHIIE depleted the W'target by 50% within the first minute, with the remaining 50% depleted evenly across the remainder of the interval. The paired samples -test revealed no differences in the percentage of training time spent above 90% of VO (PT ≥ 90% VO ) between SPHIIE and FSHIIE with an average of 25.20% and 26.07%, respectively. Pairwise comparisons indicated a difference between minute 1 peak VO , minute 2, and minute 3, while no differences were present between minutes 2 and 3. The results suggest that when HIIE formats are matched based on W' expenditure, there are no differences in PT ≥ 90% VO or peak VO during each interval.