[Calories] Update formulas for less active inflation

apps/calories/ChangeLog

@@ -1 +1,2 @@
 0.01: Initial app based on #4092
+0.02: Adjust formula slightly and fix overestimated active calories by scaling based on max HR (#4286)

apps/calories/README.md

@@ -30,7 +30,8 @@ The app uses the algorithm below:
    **Not Set (avg):** `(-37.7495+(0.5390 x Heart Rate)+(0.0362 x Weight)+(0.1375 x Age))/4.184`
 
 4. Blends the two according to the steps taken (Higher steps per min --> steps weighted more due to potential HRM inaccuracy)
-5. Returns the total calories burned in that interval, active calories (calories actively burned), and BMR calories (calories passively burned)
+5. Uses Max HRM to interpolate between how much it should weight active calories (avoids overestimates)
+6. Returns the total calories burned in that interval, active calories (calories actively burned), and BMR calories (calories passively burned)
 
 ## Clock Info
 This app adds a set of ClockInfos in the `Health` list:

apps/calories/lib.js

@@ -93,6 +93,7 @@ exports.calcBMR = function (myProfile) {
   }
   return bmr / 1440;
 };
+
 // Main formula for calculating calories. Takes health data with duration in minutes, and a myprofile data set.
 exports.calcCalories = function (healthData, myProfile) {
   if (!healthData || !healthData.duration) return;
@@ -123,13 +124,16 @@ exports.calcCalories = function (healthData, myProfile) {
     print("Invalid or missing heart rate data");
     return;
   }
-
+
+  const lerp = (x, min, max) => Math.min(Math.max((x - min) / (max - min), 0), 1);
+
   let ageMultiplier = 1.0;
-
+  let activeCaloriesCoefficient=lerp(hr, myProfile.maxHrm*0.5, myProfile.maxHrm*0.6) // use hr extertion level between 50% and 60% of max HR to determine active calories.
+  print("lerp: "+activeCaloriesCoefficient)
+
   let stepsMet =
     (stepsPerMin < 5 ? 1.0 : 2.0 + 0.05 * stepsPerMin) * ageMultiplier; // More realistic scaling with age adjustment
-
-  // calculate calories using current HR (not HRR - that was causing inflation)
+  // calculate calories using current HR 
   if (myProfile.gender != undefined && myProfile.gender != 2 /*not set*/) {
     if (myProfile.gender == 0) {
       //male
@@ -145,37 +149,34 @@ exports.calcCalories = function (healthData, myProfile) {
     hrKcalMin =
       (-37.7495 + 0.539 * hr + 0.0362 * weight + 0.1375 * age) / 4.184;
   }
-
+  
   // extract active portion (subtract BMR)
-  hrKcalMin = Math.max(0, hrKcalMin - bmr); // formula adds BMR by default
-
+  hrKcalMin = Math.max(0, hrKcalMin - bmr) * activeCaloriesCoefficient; 
+  print("hrcal: "+hrKcalMin)
   let stepsKcalMin = (stepsMet * 3.5 * weight) / 200;
+  print("stepsCal: "+stepsKcalMin)
   // blend METs
   let finalActiveKcalMin = 0;
-  if (stepsPerMin > 120) {
+  print("stepsPerMin: "+stepsPerMin)
+  if (stepsPerMin > 180) {
     // strenuous activity
-    finalActiveKcalMin = hrKcalMin * 0.8 + stepsKcalMin * 0.2;
-  } else if (stepsPerMin >= 10) {
-    // moderate activity
     finalActiveKcalMin = hrKcalMin * 0.5 + stepsKcalMin * 0.5;
+  } else if (stepsPerMin >= 60) {
+    // moderate activity
+    finalActiveKcalMin = hrKcalMin * 0.8 + stepsKcalMin * 0.2;
   } else {
-    // sedentary or non-step activity (weights)
-    // For elderly, don't penalize as much - might be resistance training
-    if (age > 65) {
-      finalActiveKcalMin = hrKcalMin * 0.8;
-    } else {
-      finalActiveKcalMin = hrKcalMin;
-    }
+    finalActiveKcalMin = hrKcalMin*0.96+stepsKcalMin * 0.04;
   }
-
+  
   // ensure non-negative
   finalActiveKcalMin = Math.max(0, finalActiveKcalMin);
-
+  
   // final Outputs
   let activeTotal = finalActiveKcalMin * healthData.duration;
+  print("finalActive: "+activeTotal)
   // boot.js adds bmr separately
   return {
     activeCalories: Math.round(Math.max(0, activeTotal)),
     bmrCalories: Math.round(bmr * healthData.duration)
   };
-};
+};

apps/calories/metadata.json

@@ -3,7 +3,7 @@
   "name": "Calorie Tracker (BETA)",
   "shortName":"Calories",
   "icon": "icon.png",
-  "version":"0.01",
+  "version":"0.02",
   "description": "A health-integrated calorie tracker using `MyProfile`. Currently in Beta Testing - see README for more details.",
   "type":"app",    
   "tags": "health,clkinfo",