@nathaliem/one-rep-max/dist/index.mjs

One Rep Max calculations

var __defProp = Object.defineProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};

// src/formulas.ts
var formulas_exports = {};
__export(formulas_exports, {
  brzycki: () => brzycki,
  epley: () => epley,
  landers: () => landers,
  lombardi: () => lombardi,
  mayhew: () => mayhew,
  oconner: () => oconner,
  wathan: () => wathan
});
function epley(weight, reps) {
  return weight * (1 + reps / 30);
}
function brzycki(weight, reps) {
  return weight * (36 / (37 - reps));
}
function lombardi(weight, reps) {
  return weight * Math.pow(reps, 0.1);
}
function mayhew(weight, reps) {
  return 100 * weight / (52.2 + 41.9 * Math.exp(-0.055 * reps));
}
function oconner(weight, reps) {
  return weight * (1 + 0.025 * reps);
}
function wathan(weight, reps) {
  return 100 * weight / (48.8 + 53.8 * Math.exp(-0.075 * reps));
}
function landers(weight, reps) {
  return 100 * weight / (101.3 - 2.67123 * reps);
}

// src/index.ts
function getOneRepMax(weight, reps, decimals = 2, formula) {
  if (!formula) {
    return parseFloat(averageOneRepMax(weight, reps).toFixed(decimals));
  }
  const fn = formulas_exports[formula];
  if (!fn) throw new Error("Unknown formula");
  return parseFloat(fn(weight, reps).toFixed(decimals));
}
function averageOneRepMax(weight, reps) {
  const formulas = [
    "epley",
    "brzycki",
    "lombardi",
    "mayhew",
    "oconner",
    "wathan",
    "landers"
  ];
  const estimates = formulas.map((f) => getOneRepMax(weight, reps, 2, f));
  return estimates.reduce((a, b) => a + b, 0) / estimates.length;
}
function getAllFormulas(weight, reps, decimals = 2) {
  return Object.fromEntries(
    Object.keys(formulas_exports).map((f) => [
      f,
      +formulas_exports[f](weight, reps).toFixed(decimals)
    ])
  );
}
export {
  averageOneRepMax,
  getAllFormulas,
  getOneRepMax
};