Contextualizing the Norwegian standardized intensity zone framework in an international sample of endurance practitioners

Figures

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  Fig. 1. Alignment of the 3- and 5-zone scales anchored by two common lactate/ventilatory turn points (black dashed lines) defining a threshold region (yellow). The figure is adapted from Sitko et al.5 with permission. The original version can be found in Seiler2. HRmax = maximal heart rate; LT1 = lactate turn point 1; LT2 = lactate turn point 2; \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\dot{\text{V}}$$\end{document}˙O2max = maximal oxygen uptake; VT1 = ventilatory turn point 1; VT2 = ventilatory turn point 2.

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  Fig. 2. Frequency distribution of the number of intensity zones used in practice by the total sample (n = 710).

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  Fig. 3. Percentage distribution of the number of intensity zones used across geographic regions (n = 710). EU = other European countries; UK = United Kingdom; US = United States.

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  Fig. 4. Estimation of the lower limit of intensity Zones 1–5 (relative to maximum heart rate) organized by geographic region. Mean (markers) and standard deviation (error bars) are indicated. EU = other European countries; UK = United Kingdom; US = United States; %HRmax = percentage of maximum heart rate.

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  Fig. 5. Estimation of the lower limit of intensity Zones 1–5 (relative to maximum heart rate) organized by sport. Mean (markers) and standard deviation (error bars) are indicated. Cycling = road- and mountain cycling; Running = middle-, long-, and ultra-distance running; Skiing = cross-country skiing and biathlon; %HRmax = percentage of maximum heart rate.

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  Fig. 6. Kernel density estimation of the lower limit of intensity Zones 1–5 (relative to maximum heart rate) split by role; athlete vs. coach. Median (solid line) and upper and lower quartiles (dashed lines) are indicated. %HRmax = percentage of maximum heart rate.

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  Fig. 7. Kernel density estimation of the lower limit of intensity zones 1–5 (relative to maximum heart rate) split by level; low (Tiers 1–2) vs. high (Tiers 3–5). Median (solid line) and upper and lower quartiles (dashed lines) are indicated. %HRmax = percentage of maximum heart rate.