Methods and devices for determining exercise compliance diagnostics
First Claim
1. In an implantable cardiac device, a method of determining a duration of activity for a patient, said method comprising:
- obtaining an activity threshold based on historical patient heart-rate data and historical patient activity data measured by the implantable cardiac device;
obtaining a plurality of heart rate measurements measured by the implantable cardiac device;
obtaining a plurality of activity level measurements measured by the implantable cardiac device;
determining with the implantable cardiac device a plurality of activity correlation values (CORRcurrent) using the formula;
CORRcurrent=HRR×
(ACTcurrent−
ACToffset),wherein;
CORRcurrent is a current activity correlation value, HRR is heart rate reserve, ACTcurrent is an activity measurement output by an activity sensor of the implantable cardiac device, and ACToffset is an activity offset parameter; and
monitoring with the implantable cardiac device the amount of time correlation values exceed the activity threshold to determine the duration of activity.
1 Assignment
0 Petitions
Accused Products
Abstract
One or more sensors sense patient heart rate and patient activity and provide related signals to a processor. The processor is responsive to sensor signals and obtains an activity threshold based on historical patient heart-rate signals and historical patient activity signals. The processor periodically derives a correlation value from current patient heart-rate signals and current patient activity signals and compares the correlation values to the activity threshold. A start of activity is noted when a correlation value exceeds the activity threshold; while an end of activity is noted when a correlation value fails to exceed the activity threshold. Activity is identified as exercise when correlation values continue to exceed the activity threshold for a predetermine amount of time, while an end of exercise is noted when correlation values fall below the activity threshold for a predetermined amount of time.
74 Citations
20 Claims
-
1. In an implantable cardiac device, a method of determining a duration of activity for a patient, said method comprising:
-
obtaining an activity threshold based on historical patient heart-rate data and historical patient activity data measured by the implantable cardiac device; obtaining a plurality of heart rate measurements measured by the implantable cardiac device; obtaining a plurality of activity level measurements measured by the implantable cardiac device; determining with the implantable cardiac device a plurality of activity correlation values (CORRcurrent) using the formula;
CORRcurrent=HRR×
(ACTcurrent−
ACToffset),wherein;
CORRcurrent is a current activity correlation value, HRR is heart rate reserve, ACTcurrent is an activity measurement output by an activity sensor of the implantable cardiac device, and ACToffset is an activity offset parameter; andmonitoring with the implantable cardiac device the amount of time correlation values exceed the activity threshold to determine the duration of activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A device comprising:
-
one or more sensors for sensing patient heart rate and patient activity and providing related signals; and a processor responsive to the signals from the one or more sensors and operative to; obtain an activity threshold based on historical patient heart-rate signals and historical patient activity signals; periodically derive correlation values from current patient heart-rate signals and current patient activity signals using the formula;
CORRcurrent=HRR×
(ACTcurrent−
ACToffset),wherein;
CORRcurrent is a current activity correlations value, HRR is heart rate reserve, ACTcurrent is an activity measurement output by an activity sensor of the implantable cardiac device, and ACToffset is an activity offset parameter; andcompare the correlation values to the activity threshold to identify periods of activity. - View Dependent Claims (14, 15)
-
-
16. A system for determining a duration of activity for a patient, said system comprising:
-
means for obtaining an activity threshold based on historical patient heart-rate data and historical patient activity data; means for periodically deriving a correlation value from current patient heart-rate signals and current patient activity signals; and means for identifying a start and an end of activity based on the correlation values and the activity threshold. - View Dependent Claims (17, 18, 19, 20)
-
Specification