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- Title
Short-term interval training at both lower and higher intensities in the severe exercise domain result in improvements in V̇O₂ on-kinetics.
- Authors
Turnes, Tiago; Aguiar, Rafael; Cruz, Rogério; Lisbôa, Felipe; Pereira, Kayo; Caputo, Fabrizio; de Aguiar, Rafael Alves; de Oliveira Cruz, Rogério Santos; Lisbôa, Felipe Domingos; Pereira, Kayo Leonardo
- Abstract
<bold>Purpose: </bold>Although high-intensity interval training (HIT) seems to promote greater improvements in aerobic parameters than continuous training, the influence of exercise intensity on [Formula: see text] on-kinetics remains under investigation.<bold>Methods: </bold>After an incremental test, twenty-one recreationally trained cyclists performed several time-to-exhaustion tests to determine critical power (CP), and the highest intensity (I HIGH), and the lowest exercise duration (T LOW) at which [Formula: see text] is attained during constant exercise. Subjects also completed a series of step transitions to moderate- and heavy-intensity work rates to determine pulmonary [Formula: see text] on-kinetics. Surface electromyography (EMG) of vastus lateralis muscle and blood lactate accumulation (∆BLC) was measured during heavy exercise. Subjects were assigned to one of two 4-week work-matched training groups: the lower [105 % CP: n = 11; 4 × 5 min at 105 % CP (218 ± 39 W), 1 min recovery] or the upper [I HIGH: n = 10; 8 × 100 % I HIGH (355 ± 60 W), 1:2 work:recovery ratio] intensity of the severe exercise domain.<bold>Results: </bold>The two interventions were similarly effective in reducing the phase II [Formula: see text] time constant during moderate (105 % CP: 34 ± 13 to 25 ± 8 s; I HIGH: 31 ± 9 to 23 ± 6 s) and heavy exercise (105 % CP: 25 ± 7 to 18 ± 5 s; I HIGH: 27 ± 7 to 16 ± 5 s) and in reducing the amplitude of [Formula: see text] slow component, EMG amplitude, and ∆BLC during heavy exercise.<bold>Conclusion: </bold>In conclusion, the short-term adjustments in response to step transitions to moderate and heavy exercise were independent of training intensity within the severe exercise domain.
- Subjects
CONCURRENT training (Physical training &; conditioning); CYCLING training; ANAEROBIC threshold; EXERCISE tolerance; ELECTROMYOGRAPHY; FATIGUE (Physiology)
- Publication
European Journal of Applied Physiology, 2016, Vol 116, Issue 10, p1975
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-016-3449-0