Abstract
Purpose
Improvements in D′ (the fatigability constant for running) subsequent to training interventions remain elusive. High-intensity interval training (HIIT) within the severe intensity domain for short durations (< 2-min) have been theorized to improve D′. The purpose of the present study was to assess this in a group of moderately trained individuals.
Methods
Eighteen participants completed graded exercise testing (GXT), 40-m sprint testing and a 3-min all-out test (3MT) for running to determine key mechanistic and physiological parameters. Participants were randomly assigned into one of two groups based on intensity prescription (G140% = 140% of critical speed [CS]), or time intervals (G90-s = 90-s) to complete a twice-weekly training intervention for 6-weeks followed by re-assessment.
Results
No between-group differences were present either prior to or following the intervention. Substantial and meaningful improvements were detected during the post-intervention period for both groups for VO2max (G140%: + 7.60%; G90-s: + 11.67%), speed evoking VO2max (sVO2max; G140%: + 4.33%; G90-s: + 2.92%), gas exchange threshold (GET; G140%: + 12.02%; G90-s: + 20.52%), speed evoking GET (sGET; G140%: + 4.17%; G90-s: + 7.92%), CS (G140%: M = 0.62 m/s; G90-s: M = 0.46 m/s), D′ (G140%: M = − 56.34 m; G90-s: M = − 18.36 m), FI% (G140% M = − 6.75%; G90-s: M = − 4.38%) and maximal distance (G140%: M = 49.67 m; G90-s: M = 58.38 m).
Conclusions
The prescribed intensities and durations were insufficient to elicit improvements in D′. Improvements in D′ may be dependent on very short-duration intervals (i.e. < 60 to 90-s) at speeds exceeding 140% CS but below maximal sprint speed.
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MK conceived the study, performed the data analysis, and drafted and revised the manuscript. EJT completed data collection, contributed to data analysis and interpretation as well as drafting and revising the manuscript. RWP contributed to data interpretation and helped to draft and revise the manuscript. All authors have read and approved the final version of the manuscript and agree with the order of the presentation of the authors.
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Thomas, E.J., Pettitt, R.W. & Kramer, M. High-Intensity Interval Training Prescribed Within the Secondary Severe-Intensity Domain Improves Critical Speed But Not Finite Distance Capacity. J. of SCI. IN SPORT AND EXERCISE 2, 154–166 (2020). https://doi.org/10.1007/s42978-020-00053-6
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DOI: https://doi.org/10.1007/s42978-020-00053-6