diff --git a/YD_AllHeartRates.Api/Services/Impl/HeartRateReportHelper.cs b/YD_AllHeartRates.Api/Services/Impl/HeartRateReportHelper.cs
index c186424..8bd810e 100644
--- a/YD_AllHeartRates.Api/Services/Impl/HeartRateReportHelper.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/HeartRateReportHelper.cs
@@ -34,7 +34,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
             for (int hour = minHour; hour <= maxHour; hour++)
             {
                 chart.AxisX.Add($"{hour:00}:00");
-                chart.AxisY.Add(hourlyAvg.TryGetValue(hour, out int val) ? val : 0);
+                chart.AxisY.Add(hourlyAvg.TryGetValue(hour, out int val) ? val : 80);
             }
 
             return chart;