diff --git a/src/DBAccess.cpp b/src/DBAccess.cpp
index 6a52a7c70..b2cd7ef58 100644
--- a/src/DBAccess.cpp
+++ b/src/DBAccess.cpp
@@ -71,8 +71,9 @@
 // 50  29  Oct 2013 Mark Liversedge    Added percentage time in heartrate zone
 // 51  05  Nov 2013 Mark Liversedge    Added average aPower
 // 52  05  Nov 2013 Mark Liversedge    Added EOA - Effect of Altitude
+// 53  18  Dec 2013 Mark Liversedge    Added Fatigue Index (for power)
 
-int DBSchemaVersion = 52;
+int DBSchemaVersion = 53;
 
 DBAccess::DBAccess(Context* context) : context(context), db(NULL)
 {
diff --git a/src/PeakPower.cpp b/src/PeakPower.cpp
index 8ab2eb173..2e37ec376 100644
--- a/src/PeakPower.cpp
+++ b/src/PeakPower.cpp
@@ -22,6 +22,46 @@
 #include <math.h>
 #include <QApplication>
 
+class FatigueIndex : public RideMetric {
+    Q_DECLARE_TR_FUNCTIONS(FatigueIndex)
+    double maxp;
+    double minp;
+
+    public:
+
+    FatigueIndex() : maxp(0.0), minp(10000)
+    {
+        setType(RideMetric::Average);
+        setSymbol("power_fatigue_index");
+        setInternalName("Fatigue Index");
+        setName(tr("Fatigue Index"));
+        setMetricUnits(tr("%"));
+        setPrecision(1); // e.g. 99.9%
+        setImperialUnits(tr("%"));
+
+    }
+    void compute(const RideFile *ride, const Zones *, int,
+                 const HrZones *, int,
+                 const QHash<QString,RideMetric*> &,
+                 const Context *) {
+
+        if (ride->dataPoints().isEmpty() || !ride->areDataPresent()->watts) {
+            // no data
+            setValue(0.0);
+
+        } else {
+            foreach(const RideFilePoint *point, ride->dataPoints()) {
+                if (point->watts < minp && point->watts != 0) minp = point->watts;
+                if (point->watts > maxp && point->watts != 0) maxp = point->watts;
+            }
+
+            if (minp > maxp) setValue(0.00); // minp wasn't changed, all zeroes?
+            else setValue(100 * ((maxp-minp)/maxp)); // as a percentage
+        }
+    }
+    RideMetric *clone() const { return new FatigueIndex(*this); }
+};
+
 class PeakPower : public RideMetric {
     Q_DECLARE_TR_FUNCTIONS(PeakPower)
     double watts;
@@ -474,6 +514,8 @@ class PeakPowerHr60m : public PeakPowerHr {
 };
 
 static bool addAllPeaks() {
+    RideMetricFactory::instance().addMetric(FatigueIndex()); // added here instead of new function
+
     RideMetricFactory::instance().addMetric(PeakPower1s());
     RideMetricFactory::instance().addMetric(PeakPower5s());
     RideMetricFactory::instance().addMetric(PeakPower10s());