36 lines
1.0 KiB
TypeScript
36 lines
1.0 KiB
TypeScript
import { Interval } from "../ast";
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// Training Stress Score formula from Training and Racing with a Power Meter:
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//
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// TSS = (s * W * IF) / (FTP * 3600) * 100
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//
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// s - duration in seconds
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// W - power in watts
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// IF - intensity factor (power / FTP)
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const steadyTss = (duration: number, intensity: number): number => {
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return ((duration * intensity * intensity) / 3600) * 100;
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};
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const rangeTss = (duration: number, from: number, to: number): number => {
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let score = 0;
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const step = 1;
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for (let i = 0; i < duration; i += step) {
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const intensity = from + (to - from) * (i / duration);
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score += steadyTss(step, intensity);
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}
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return score;
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};
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const intervalTss = ({ duration, intensity }: Interval): number => {
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if (intensity.from === intensity.to) {
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return steadyTss(duration, intensity.from);
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} else {
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return rangeTss(duration, intensity.from, intensity.to);
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}
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};
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export const tss = (intervals: Interval[]): number => {
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return intervals.map(intervalTss).reduce((a, b) => a + b, 0);
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};
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