Technical feasibility of constant-load and high-intensity interval training for cardiopulmonary conditioning using a re-engineered dynamic leg press

Figures

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  Fig. 1. Exercise testing protocols. Ptarget: target work rate. a CLT protocol; b HIIT protocol

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  Fig. 2. Dynamic leg press augmented with work rate estimation and visual feedback. (adapted from [18])

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  Fig. 3. Original data records from participant 1. Left: CLT, Right: HIIT. (a,b) Oxygen uptake \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2}$\end{document}V˙O2. (c,d) Heart rate HR. (e,f) Respiratory exchange ratio (RER). (g,h) Target and measured work rates (Ptarget, P). Parts (a)–(d): the green line indicates the target values, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}1}$\end{document}V˙O2VT1 for the CLT and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}2}$\end{document}V˙O2VT2 for the HIIT (Table 2); the dashed black line indicates the measured mean value,…

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  Fig. 4. Original data records from participant 2. Left: CLT, Right: HIIT. (a,b) Oxygen uptake \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2}$\end{document}V˙O2. (c,d) Heart rate HR. (e,f) Respiratory exchange ratio (RER). (g,h) Target and measured work rates (Ptarget, P). Parts (a)–(d): the green line indicates the target values, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}1}$\end{document}V˙O2VT1 for the CLT and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}2}$\end{document}V˙O2VT2 for the HIIT (Table 2); the dashed black line indicates the measured mean value,…

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  Fig. 5. Original data records from participant 3. Left: CLT, Right: HIIT. (a,b) Oxygen uptake \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2}$\end{document}V˙O2. (c,d) Heart rate HR. (e,f) Respiratory exchange ratio (RER). (g,h) Target and measured work rates (Ptarget, P). Parts (a)–(d): the green line indicates the target values, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}1}$\end{document}V˙O2VT1 for the CLT and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}2}$\end{document}V˙O2VT2 for the HIIT (Table 2); the dashed black line indicates the measured mean value,…

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  Fig. 6. Original data records from participant 4. Left: CLT, Right: HIIT. (a,b) Oxygen uptake \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2}$\end{document}V˙O2. (c,d) Heart rate HR. (e,f) Respiratory exchange ratio (RER). (g,h) Target and measured work rates (Ptarget, P). Parts (a)–(d): the green line indicates the target values, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}1}$\end{document}V˙O2VT1 for the CLT and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}2}$\end{document}V˙O2VT2 for the HIIT (Table 2); the dashed black line indicates the measured mean value,…

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  Fig. 7. Original data records from participant 5. Left: CLT, Right: HIIT. (a,b) Oxygen uptake \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2}$\end{document}V˙O2. (c,d) Heart rate HR. (e,f) Respiratory exchange ratio (RER). (g,h) Target and measured work rates (Ptarget, P). Parts (a)–(d): the green line indicates the target values, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}1}$\end{document}V˙O2VT1 for the CLT and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\dot {V}\mathrm {O}_{2\text {VT}2}$\end{document}V˙O2VT2 for the HIIT (Table 2); the dashed black line indicates the measured mean value,…