Relationships between percentage of maximal oxygen consumption (\documentclass[12pt]{minimal}
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\begin{document}\end{document}) and percentage of maximal heart rate reserve (\documentclass[12pt]{minimal}
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\begin{document}\end{document}) were compared during steady states of exercise (S), transitory states of exercise (T) and a 5-min recovery period (R). Male adults [mean age 27 (SD 10) years] were studied exercising on a treadmill (TR, \documentclass[12pt]{minimal}
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\begin{document}\end{document}), cycle ergometer (CE, \documentclass[12pt]{minimal}
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\begin{document}\end{document}) and arm traction bench (ATB, \documentclass[12pt]{minimal}
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\begin{document}\end{document}). The exercise intensity was adjusted according to the subjects in order to reach exhaustion in 4–5 steps of 2 min (ATB) or 3 min (TR, CE). The 1st min of each stage was considered as T and the last minute of each stage as S. The oxygen consumption (\documentclass[12pt]{minimal}
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\begin{document}\end{document}) and heart rate (\documentclass[12pt]{minimal}
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\begin{document}\end{document}) were recorded simultaneously. Significant correlations were observed for each type of exercise and for each state between \documentclass[12pt]{minimal}
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\begin{document}\end{document} and \documentclass[12pt]{minimal}
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\begin{document}\end{document} (\documentclass[12pt]{minimal}
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\begin{document}\end{document} range 0.87–1.00). During T and R, the \documentclass[12pt]{minimal}
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\begin{document}\end{document} versus \documentclass[12pt]{minimal}
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\begin{document}\end{document} relationships were laterally shifted, suggesting a resetting of \documentclass[12pt]{minimal}
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\begin{document}\end{document} control mechanisms. In S, the intercept was greater than in T and R; in T, the slope was greater than in S and R. The \documentclass[12pt]{minimal}
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\begin{document}\end{document} could be predicted from individual \documentclass[12pt]{minimal}
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\begin{document}\end{document} versus \documentclass[12pt]{minimal}
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\begin{document}\end{document} relationships during T and R as is usually done in S using specific equations. Taking into consideration the average relationships established on the three ergometers, the standard error of the predicted \documentclass[12pt]{minimal}
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\begin{document}\end{document} during S and T reached 10%–20% and 22%–38% in R. During exercise, the higher the intensity the better was the prediction of \documentclass[12pt]{minimal}
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\begin{document}\end{document} from \documentclass[12pt]{minimal}
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\begin{document}\end{document} (\documentclass[12pt]{minimal}
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\begin{document}\end{document} range 0.46–0.60, \documentclass[12pt]{minimal}
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\begin{document}\end{document}). Therefore except at high exercise intensities, it was found that individual relationships had to be used to obtain an accurate estimation of \documentclass[12pt]{minimal}
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