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High-intensity decreasing interval training (HIDIT) increases time above 90% $$\dot{V}$$O2peak

2020; Springer Science+Business Media; Volume: 120; Issue: 11 Linguagem: Inglês

10.1007/s00421-020-04463-w

1439-6327

Filippo Vaccari, Nicola Giovanelli, Stefano Lazzer,

Muscle activation and electromyography studies

Abstract Purpose Training near $$\dot{V}$$ V ˙ O 2 max is considered to be the most effective way to enhance $$\dot{V}$$ V ˙ O 2 max. High-intensity interval training (HIIT) is a well-known time-efficient training method for improving cardiorespiratory and metabolic function and $$\dot{V}$$ V ˙ O 2 max. While long HIIT bouts allow $$\dot{V}$$ V ˙ O 2 max to be achieved quickly, short HIIT bouts improve time to exhaustion (Tlim). The aim of this study was to evaluate the time spent above 90% $$\dot{V}$$ V ˙ O 2 peak ( T > 90% $$\dot{V}$$ V ˙ O 2 peak) during three different HIIT protocols. Methods Twelve cyclists performed three HIIT sessions. Each protocol had the same work and recovery power and ratio of work·recovery −1 . The protocols consisted of long-interval HIIT (LI HIIT , 3 min work—2 min recovery), short-interval HIIT (SI HIIT , 30 s work—20 s recovery), and high-intensity decreasing interval training (HIDIT, work from 3 min to 30 s and recovery from 2 min to 20 s). T > 90% $$\dot{V}$$ V ˙ O 2 peak, Tlim, blood lactate [La], and rate of perceived exertion (RPE) were measured at Tlim. Results T > 90% $$\dot{V}$$ V ˙ O 2 peak was greater in HIDIT (312 ± 207 s) than in SI HIIT (182 ± 225 s; P = 0.036) or LI HIIT (179 ± 145 s; P = 0.027). Tlim was not significantly different ( P > 0.05) between HIDIT (798 ± 185 s), SI HIIT (714 ± 265 s), and LI HIIT (664 ± 282). At Tlim, no differences in [La] and RPE were found between protocols ( P > 0.05). Conclusion HIDIT showed the highest T > 90% $$\dot{V}$$ V ˙ O 2 peak, suggesting that it may be a good strategy to increase time close to $$\dot{V}$$ V ˙ O 2 peak, despite similar Tlim, [La], and RPE at Tlim.