diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 2c0bf3b..9b84410 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -3,7 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="uk.org.openseizuredetector"
     android:versionCode="115"
-    android:versionName="4.1.3m">
+    android:versionName="4.1.3n">
     <!-- android:allowBackup="false" -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdAlgHr.java b/app/src/main/java/uk/org/openseizuredetector/SdAlgHr.java
new file mode 100644
index 0000000..78083dd
--- /dev/null
+++ b/app/src/main/java/uk/org/openseizuredetector/SdAlgHr.java
@@ -0,0 +1,83 @@
+package uk.org.openseizuredetector;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Handler;
+import android.preference.PreferenceManager;
+import android.util.Log;
+
+public class SdAlgHr {
+    private final static String TAG = "SdAlgHr";
+    private Context mContext;
+    private OsdUtil mUtil;
+    private boolean mSimpleHrAlarmActive;
+    private double mSimpleHrAlarmThreshMin;
+    private double mSimpleHrAlarmThreshMax;
+
+    private boolean mAdaptiveHrAlarmActive;
+    private double mAdaptiveHrAlarmWindowSecs;
+    private int mAdaptiveHrAlarmWindowDp;
+    private double mAdaptiveHrAlarmThresh;
+    private boolean mAverageHrAlarmActive;
+    private double mAverageHrAlarmWindowSecs;
+    private int mAverageHrAlarmWindowDp;
+    private double mAverageHrAlarmThreshMin;
+    private double mAverageHrAlarmThreshMax;
+
+
+    public SdAlgHr(Context context) {
+        Log.d(TAG, "SdAlgHr Constructor");
+        mContext = context;
+        mUtil = new OsdUtil(mContext, new Handler());
+    }
+
+    public void close() {
+        Log.d(TAG, "close()");
+    }
+
+    public float getAlarmState(SdData sdData) {
+        return (0);
+    }
+
+    private double readDoublePref(SharedPreferences SP, String prefName, String defVal) {
+        String prefValStr;
+        double retVal = -1;
+        try {
+            prefValStr = SP.getString(prefName, defVal);
+            retVal = Double.parseDouble(prefValStr);
+        } catch (Exception ex) {
+            Log.v(TAG, "readDoublePref() - Problem with preference!");
+            mUtil.writeToSysLogFile(TAG+".readDoublePref() - Problem with  preference!");
+            mUtil.showToast(TAG+":"+mContext.getString(R.string.problem_parsing_preferences));
+        }
+        return retVal;
+    }
+
+    private void updatePrefs() {
+        /**
+         * updatePrefs() - update basic settings from the SharedPreferences
+         * - defined in res/xml/prefs.xml
+         */
+        Log.i(TAG, "updatePrefs()");
+        mUtil.writeToSysLogFile(TAG+".updatePrefs()");
+
+        SharedPreferences SP = PreferenceManager
+                .getDefaultSharedPreferences(mContext);
+        mSimpleHrAlarmActive = SP.getBoolean("HRAlarmActive", false);
+        mSimpleHrAlarmThreshMin = readDoublePref(SP, "HRThreshMin", "20");
+        mSimpleHrAlarmThreshMax = readDoublePref(SP, "HRThreshMax", "150");
+
+
+        mAdaptiveHrAlarmActive = SP.getBoolean("HRAdaptiveAlarmActive", false);
+        mAdaptiveHrAlarmWindowSecs = readDoublePref(SP, "HRAdaptiveAlarmWindowSecs", "30");
+        mAdaptiveHrAlarmWindowDp = (int)Math.round(mAdaptiveHrAlarmWindowSecs/5.0);
+        mAdaptiveHrAlarmThresh = readDoublePref(SP, "HRAdaptiveAlarmThresh", "20");
+
+        mAverageHrAlarmActive = SP.getBoolean("HRAverageAlarmActive", false);
+        mAverageHrAlarmWindowSecs = readDoublePref(SP, "HRAverageAlarmWindowSecs", "120");
+        mAverageHrAlarmWindowDp = (int)Math.round(mAverageHrAlarmWindowSecs/5.0);
+        mAverageHrAlarmThreshMin = readDoublePref(SP, "HRAverageAlarmThreshMin", "40");
+        mAverageHrAlarmThreshMax = readDoublePref(SP, "HRAverageAlarmThreshMax", "120");
+
+    }
+}
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 7a249db..eb2f096 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -488,4 +488,17 @@
     <string name="no_button_title">NO</string>
     <string name="privacy_policy_button_title">Privacy Policy</string>
     <string name="data_sharing_button_title">Data Sharing</string>
+    <string name="HRAdaptiveAlarmEnabledTitle">Enable Adaptive Threshold Heart Rate Alarm</string>
+    <string name="HRAdaptiveAlarmWindowTitle">Moving Average Time Window (seconds)</string>
+    <string name="HRAdaptiveAlarmWindowSummary">Window must be a multiple of 5 seconds</string>
+    <string name="HRAdaptiveThreshTitle">Adaptive Threshold Offset (bpm)</string>
+    <string name="HRAdaptiveThreshSummary">The alarm threshold offset from the average measured Heart Rate (bpm)</string>
+    <string name="HRAverageAlarmEnabledTitle">Enable Alarm based on rolling average heart rate</string>
+    <string name="HRAverageAlarmEnabledSummary" />
+    <string name="HRAverageThreshMinSummary">Lower Heart Rate Threshold for Average Heart Rate Alarm</string>
+    <string name="HRAverageThreshMinTitle">Lower Threshold for Average Heart Rate Alarm</string>
+    <string name="HRAverageThreshMaxSummary">Upper Heart Rate Threshold for Average Heart Rate Alarm</string>
+    <string name="HRAverageThreshMaxTitle">Upper Threshold for Average Heart Rate Alarm</string>
+    <string name="HRAverageAlarmWindowTitle">Window size (in seconds) for Average Heart Rate Calculation</string>
+    <string name="HRAverageAlarmWindowSummary">Window size (in seconds) for Average Heart Rate Calculation - must be a factor of 5 seconds.</string>
 </resources>
diff --git a/app/src/main/res/xml/seizure_detector_prefs.xml b/app/src/main/res/xml/seizure_detector_prefs.xml
index bd8d12c..fc64e98 100644
--- a/app/src/main/res/xml/seizure_detector_prefs.xml
+++ b/app/src/main/res/xml/seizure_detector_prefs.xml
@@ -90,6 +90,43 @@
             android:key="HRThreshMax"
             android:summary="@string/HRThreshMaxSummary"
             android:title="@string/HRThreshMaxTitle" />
+
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="HRAdaptiveAlarmActive"
+            android:summary="@string/HRAlarmEnabledSummary"
+            android:title="@string/HRAdaptiveAlarmEnabledTitle" />
+        <EditTextPreference
+            android:defaultValue="30"
+            android:key="HRAdaptiveAlarmWindowSecs"
+            android:summary="@string/HRAdaptiveAlarmWindowSummary"
+            android:title="@string/HRAdaptiveAlarmWindowTitle" />
+        <EditTextPreference
+            android:defaultValue="20"
+            android:key="HRAdaptiveAlarmThresh"
+            android:summary="@string/HRAdaptiveThreshSummary"
+            android:title="@string/HRAdaptiveThreshTitle" />
+
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="HRAverageAlarmActive"
+            android:summary="@string/HRAverageAlarmEnabledSummary"
+            android:title="@string/HRAverageAlarmEnabledTitle" />
+        <EditTextPreference
+            android:defaultValue="40"
+            android:key="HRAverageAlarmThreshMin"
+            android:summary="@string/HRAverageThreshMinSummary"
+            android:title="@string/HRAverageThreshMinTitle" />
+        <EditTextPreference
+            android:defaultValue="120"
+            android:key="HRAverageAlarmThreshMax"
+            android:summary="@string/HRAverageThreshMaxSummary"
+            android:title="@string/HRAverageThreshMaxTitle" />
+        <EditTextPreference
+            android:defaultValue="120"
+            android:key="HRAverageAlarmWindowSecs"
+            android:summary="@string/HRAverageAlarmWindowSummary"
+            android:title="@string/HRAverageAlarmWindowTitle" />
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/O2SatSettingsTitle">