In:
Medicine & Science in Sports & Exercise, Ovid Technologies (Wolters Kluwer Health), Vol. 54, No. 7 ( 2022-7), p. 1199-1209
Abstract:
To compare the metabolic, cardiorespiratory and perceptual responses to three isoenergetic high-intensity interval exercise (HIIE) protocols of different bout duration and an isoenergetic continuous exercise protocol. Methods Eleven healthy males (age, 28 ± 6 yr) performed four 20-min cycling trials of equal mean power output 1 wk apart. Participants cycled either continuously (CON) or intermittently with 10 s (HIIE10), 30 s (HIIE30), or 60 s (HIIE60) bouts at intensities corresponding to 49% (CON) or 100% of power at peak oxygen uptake (V̇O 2peak ). Recovery intervals during the HIIE trials were 15, 45, and 90 s, respectively. Results Average V̇O 2 was similar in the HIIE trials (2.29 ± 0.42, 2.20 ± 0.43, and 2.12 ± 0.45 L·min −1 , for HIIE10, HIIE30, and HIIE60, respectively), whereas in CON (2.02 ± 0.38 L·min −1 ), it was lower than HIIE10 ( P = 0.002) and HIIE30 ( P = 0.043). Average pulmonary ventilation (V E ) was higher in HIIE60 compared with HIIE10, HIIE30, and CON (75.8 ± 21.8 L·min −1 vs 64.1 ± 14.5 L·min −1 , 64.1 ± 16.2 L·min −1 , and 54.0 ± 12.5 L·min −1 , respectively, P 〈 0.001). The peak values and oscillations of V̇O 2 and V E in HIIE60 were higher compared with all other trials ( P 〈 0.001). Blood lactate concentration was higher in HIIE60 compared with HIIE10, HIIE30, and CON from the fifth minute onward, reaching 12.5 ± 3.5, 7.2 ± 2.1, 7.9 ± 2.9, and 4.9 ± 1.6 mmol·L −1 , respectively, at the end of exercise ( P 〈 0.001). RPE was higher and affective responses were lower in HIIE60 compared with all other trials toward the end of exercise ( P 〈 0.001). Conclusions These findings highlight the importance of bout duration in HIIE, since shorter bouts resulted in attenuated metabolic and cardiorespiratory responses, lower RPE and feelings of displeasure compared with a longer bout, despite equal total work, duration, and work-to-recovery ratio. These results may have implications for the prescription of HIIE in various populations.
Type of Medium:
Online Resource
ISSN:
1530-0315
,
0195-9131
DOI:
10.1249/MSS.0000000000002905
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2022
detail.hit.zdb_id:
2031167-9
SSG:
31
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