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The Journal of Sports Medicine and Physical Fitness 2020 Oct 22

DOI: 10.23736/S0022-4707.20.11326-4


language: English

Backward extrapolation technique: analysis of different criteria after supramaximal exercise in cycling

Gabriel L. PEREIRA 1 , Carlos A. KALVA-FILHO 2, Ricardo A. BARBIERI 3, Vitor L. de ANDRADE 4, Danilo R. BERTUCCI 5, Ronaldo BUCKEN GOBBI 4, Marcelo PAPOTI 5, 6

1 Postgraduate Program in Physical Education and Sport, School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; 2 Faculty of Sciences, Sao Paulo State University (UNESP), Bauru, Brazil; 3 Centro Universitário Estácio de Ribeirão Preto, Ribeirão Preto, São Paulo, Brazil; 4 Centro Universitário UNIFAFIBE, Bebedouro, Brazil; 5 Institute of Biosciences and Postgraduate Program in Movement Sciences, Sao Paulo State University (UNESP), Rio Claro, Brazil; 6 School of Physical Education and Sports of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil


BACKGROUND: Backward extrapolation technique (BE) is used to estimate V̇ O2 from post-exercise measuring, eliminating oronasal mask (OM) during the efforts. Despite its advantage, literature presents discrepancy in applied methods. Thus, the aim of this study is to compare different mathematical criteria to estimate values of V̇ O2 during a supramaximal effort (V̇ O2PEAK). Secondly, we aim to verify the effects of OM on cycling performance.
METHODS: Twenty-four cyclists performed three days of tests, with at least 24 h of interval between each test. Firstly, a graded exercise test was applied to determine V̇ O2MAX and your correspondent intensity (iV̇ O2MAX). The second and the third day were destined to supramaximal efforts at 120% of iV̇ O2MAX, performed with (SupraMASK) and without (SupraBE) oronasal mask (OM) in a randomized order. After SupraBE, OM was coupled and BE was applied. Sixty-six values of V̇ O2 were obtained based on a linear regression fitting.
RESULTS: We found that V̇ O2PEAK can be estimated using different curve lengths. No significant differences, trivial effects sizes, high positive correlations and low systematic errors with consistent concordance were found in the selected criteria. Despite the inconvenient use of OM, the performance was not impaired and was similar in both condition (p = 0.84, ES = 0.04).
CONCLUSIONS: We conclude that it was possible to accurately estimate V̇ O2 values of a supramaximal effort without any respiratory apparatus with a time-efficient analysis. Therefore, we recommended the use of a 60 seconds V̇ O2 curve analysis with a negative extrapolation for 3 seconds.

KEY WORDS: Exercise test; Exercise tolerance; Oxygen consumption; Cardiorespiratory fitness; Regression analyses

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