@nikkiselev/ipf/esm/wilks.js

Calculate relative scores in IPF powerlifting competitions.

import kg2lbs from './libs/kg2lbs';
import format from './libs/format';
import coefficient from './libs/coefficient';
/**
 * Coefficients for Wilks v.1 before 2020
 */
const paramsV1 = {
    m: [
        -1.291e-8,
        7.01863e-6,
        -0.00113732,
        -0.002388645,
        16.2606339,
        -216.0475144,
    ],
    f: [
        -9.054e-8,
        4.731582e-5,
        -0.00930733913,
        0.82112226871,
        -27.23842536447,
        594.31747775582,
    ],
};
/**
 * Coefficients for Wilks v.2 2020
 */
const paramsV2 = {
    m: [
        -1.20804336482315e-8,
        7.07665973070743e-6,
        -0.00139583381094385,
        0.073694103462609,
        8.47206137941125,
        47.4617885411949,
    ],
    f: [
        -2.3334613884954e-8,
        9.38773881462799e-6,
        -0.0010504000506583,
        -0.0330725063103405,
        13.7121941940668,
        -125.425539779509,
    ],
};
/**
 * Wilks v.2 - 2020
 */
export const wilks2 = (bodyWeight, liftedWeight, gender, unitType = 'kg', version = 2) => {
    if (unitType === 'lb') {
        bodyWeight = kg2lbs(bodyWeight);
        liftedWeight = kg2lbs(liftedWeight);
    }
    const params = version === 2 ? paramsV2[gender] : paramsV1[gender];
    const numerator = version === 2 ? 600 : 500;
    return format(liftedWeight * coefficient(bodyWeight, params, numerator));
};
/**
 * Wilks v.1 - before 2020
 */
export const wilks = (bodyWeight, liftedWeight, gender, unitType = 'kg') => wilks2(bodyWeight, liftedWeight, gender, unitType, 1);