17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 537
Session: [OP-PM23] Acute effects of HIT
Lecture room: West
Date & time: 06.07.2017 / -
Authors: Sousa, A.1,2, Fernandes, R.2, Vilas-Boas, J.P.2, Figueiredo, P.3
Institution: 1: Escola Superior de Desporto e Lazer , Instituto PolitÚcnico de Viana do Castelo , Melgašo, Portugal; 2: CIFI2D, Faculty of Sport, University of Porto, Portugal
Department: Exercise Physiology
Country: Portugal
Abstract text Introduction The time sustained at the exercise intensity corresponding to VO2max (Tlim) provides information on both aerobic and anaerobic fitness, helping monitoring the training effects and prescribing training loads. In fact, the use of a fraction of Tlim (e.g. 60%) has been used for stablishing high intensity interval training (HIIT) for endurance athletes (Hill and Rowel, 1996). Considering the similar values of Tlim among different exercises modes (Sousa et al., 2015), it is expected that a fraction of this intensity would be similar. However, the temporal aspects of the VO2 response of Tlim are poorly understood in different exercise modes, still being unanswered whether 60% (or other percentages) of Tlim would led to similar ventilatory responses. Methods Forty five highly trained competitive male swimmers (n=11), rowers (n=13), runners (n=10) and cyclists (n=11) (mean ▒ SD; age: 23.7 ▒ 3.1 yrs, height: 1.77 ▒ 0.05 m and body mass: 68.9 ▒ 3.4 kg) performed two protocols: (i) an intermittent incremental protocol until exhaustion for VO2max and corresponding velocity (vVO2max) or power (wVO2max) assessment, and (ii) a single square-wave transition exercise from rest to the previously determined vVO2max or wVO2max intensities until volitional exhaustion to assess Tlim. Cardiopulmonary parameters were assessed breath by breath (averaged 5s) using a portable and telemetric gas analyser (K4b2, Cosmed, Italy). The percentage of VO2max at 30 and 60 s time period (t30 and t60) and at 50, 60 and 70% of Tlim (t50%, t60% and t70%) were considered for analysis. Results VO2 responses during all square-wave transitions were not different in-between exercise modes for any of the temporal parameters considered (t30: ∼77%; t60: ∼90%; t60%: ∼97% and t70%: ∼100%), with the exception of t50% that was ~6% higher in rowing compared with cycling (97.70▒2.90 vs. 92.40▒5.69%, respectively: p=0.013, η2=0.23). Discussion Considering that an optimal improvement in cardiorespiratory fitness performance relays on training at intensities corresponding of 90-100% of VO2max, the current data support a physiological rationale for prescription of HITT at VO2max intensity for 50 ≤ Tlim ≤ 70% durations. Moreover, the similar ventilatory responses at 60 and 70% of Tlim found in-between exercise modes, suggests that these intensities could be used indifferently in each exercise mode. References Sousa, A., Figueiredo, P., Zamparo, P., Pyne, D. B., Vilas-Boas, J. P., & Fernandes, R. J. (2015). Exercise modality effect on bioenergetical performance at VO2max intensity. Med Sci Sports Exerc, 47(8), 1705-1713. Hill, D. W., & Rowell, A. L. (1996). Significance of time to exhaustion during exercise at the velocity associated with. European journal of applied physiology and occupational physiology, 72(4), 383-386. Contact a.catarina.sousa@esdl.ipvc.pt
Topic: Training and Testing
Keyword I: interval training
Keyword II: exercise modes
Keyword III: VO2max