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Effects of a prior exhausting exercise on peak O2 uptake, lactate and ventilatory thresholds during ramp exercise in men
Author(s) -
Esposito Fabio,
Vanni Rosalba,
Alfieri Paola,
Cè Emiliano,
Veicsteinas Arsenio
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.1175.13
Subject(s) - blood lactate , lactate threshold , chemistry , respiratory system , respiratory exchange ratio , vo2 max , anaerobic exercise , medicine , zoology , heart rate , physical therapy , blood pressure , biology
Aim of the study was to evaluate the effects of a prior exhausting exercise on maximum performance, lactate threshold (LaT) and first ( V̇ et 1 ) and the second ( V̇ et 2 ) ventilatory thresholds. Eight young males performed a maximum ramp (25 W·min −1 ) cycloergometric test before and 5 hours after an exhausting exercise. During tests, breath‐by‐breath measurements of gas exchange, power output and blood lactate concentration ([La − ]) were obtained. LaT together with V̇ et 1 , V̇ et 2 and the amplitude of the isocapnic buffering range of exercise ( V̇ et 2 − V̇ et 1 ) were then calculated. After exhaustion it resulted that: i) the peak power significantly decreased from 247±11 W to 234±12 W (P<0.05), and a lower V̇ o 2 peak (2.77±0.15 L·min −1 vs. 2.65±0.14 L·min −1 , P<0.05) was observed; ii) LaT occurred at higher V̇ o 2 (1.96±0.10 L·min −1 and 2.15±0.15 L·min −1 before and after exhaustion, respectively; P<0.05), whereas V̇ et 1 was similar in both tests; iii) V̇ et 2 appeared at lower V̇ o 2 (2.63±0.16 L·min −1 and 2.47±0.17 L·min −1 before and after exhaustion, respectively; P<0.05), and iv) V̇ et 2 − V̇ ET 1 decreased significantly by 21±4% (P<0.05). These results show that prior exhausting exercise affected the metabolic and respiratory response of a following exercise and are compatible with the hypothesis that prior exhausting exercise alters acid‐base status and the activity of the enzymes involved in CO 2 transport and buffering systems. The study was supported by a grant of Fondazione CARIPLO.