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Exercise mode affects the time to achieve VO2max without influencing maximal exercise time at the intensity associated with VO2max in.

Grant number: 07/00040-1
Support type:Regular Research Grants - Publications - Scientific article
Duration: March 01, 2007 - July 31, 2007
Field of knowledge:Biological Sciences - Physiology - Physiology of Effort
Principal Investigator:Benedito Sérgio Denadai
Grantee:Benedito Sérgio Denadai
Home Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil

Abstract

The objective of this study was to analyze in triathletes, the possible influence of the exercise mode (running x cycling) on time to fatigue (Tlim) and oxygen uptake (VO2) response during exercise performed at the intensity associated with the achievement of maximal oxygen uptake (IVO2max). Eleven male triathletes (21.8 + 3.8 yr) performed the following tests on different days on a motorized treadmill and on a cycle ergometer: 1) incremental tests in order to determine VO2max and IVO2max and; 2) constant work rate tests to exhaustion at IVO2max to determine Tlim and to describe VO2 response (time to achieve VO2max – TAVO2max, and time maintained at VO2max - TMVO2max). No differences were found in VO2max, Tlim and TMVO2max obtained on the treadmill tests (63.7 + 4.7 ml.kg-1.min-1; 324.6 + 109.1 s; 178.9 + 93.6 s) and cycle ergometer tests (61.4 + 4.5 ml.kg-1.min-1; 390.4 + 114.4 s; 213.5 + 102.4 s). However, TAVO2max was influenced by exercise mode (145.7 + 25.3 vs. 176.8 + 20.1 s; in treadmill and cycle ergometer, respectively; P = 0.006). It is concluded that exercise modality affects the TAVO2max, without influencing Tlim and TMVO2max during exercise at IVO2max in triathletes. (AU)