Methods and apparatus for monitoring physiological responses to steady state activity
First Claim
1. A machine-assisted method comprising:
- detecting a physical activity signal, using an implantable medical device, from a human or animal subject;
detecting a different other physiological signal, from the subject, using the implantable medical device;
processing the physical activity signal to define a first time period associated with a first steady-state physical activity level of the subject, including identifying for the first time period a first beginning time at which the physical activity of the subject is deemed to be at steady state at the first steady-state physical activity level, and a first ending time at which the subject leaves the first steady-state physical activity level;
obtaining a first indicator by combining data from the other physiological signal obtained during the first time period;
processing the physical activity signal to define a second time period associated with a second steady-state physical activity level of the subject, including identifying for the second time period a second beginning time at which the physical activity of the subject is deemed to be at steady state at the second steady-state physical activity level, and a second ending time at which the subject leaves the second steady-state physical activity level;
obtaining a second indicator by combining data from the other physiological signal obtained during the second time period; and
using the first and second indicators to provide a diagnostic indicator.
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Abstract
This document discusses, among other things, methods of monitoring physiological responses to steady state activity. In an example, a physical activity signal is detected from a human or animal subject using an implantable medical device. A different, other physiological signal is also detected from the subject using the implantable medical device. The physical activity signal is processed to define first and second time periods associated with first and second steady-state physical activity levels of the subject. A first indicator is obtained by combining data from the other physiological signal obtained during the first time period. A second indicator is obtained by combining data from the other physiological signal obtained during the second time period. The first and second indicators are used provide a diagnostic indicator.
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Citations
25 Claims
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1. A machine-assisted method comprising:
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detecting a physical activity signal, using an implantable medical device, from a human or animal subject;
detecting a different other physiological signal, from the subject, using the implantable medical device;
processing the physical activity signal to define a first time period associated with a first steady-state physical activity level of the subject, including identifying for the first time period a first beginning time at which the physical activity of the subject is deemed to be at steady state at the first steady-state physical activity level, and a first ending time at which the subject leaves the first steady-state physical activity level;
obtaining a first indicator by combining data from the other physiological signal obtained during the first time period;
processing the physical activity signal to define a second time period associated with a second steady-state physical activity level of the subject, including identifying for the second time period a second beginning time at which the physical activity of the subject is deemed to be at steady state at the second steady-state physical activity level, and a second ending time at which the subject leaves the second steady-state physical activity level;
obtaining a second indicator by combining data from the other physiological signal obtained during the second time period; and
using the first and second indicators to provide a diagnostic indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A machine-assisted method comprising:
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detecting a physical activity signal, using an implantable medical device, from a human or animal subject, the physical activity signal falling within an activity range divided into activity bins;
contemporaneously detecting a different other physiological signal, from the subject, using the implantable medical device;
processing the physical activity signal to define a first time period associated with a first steady-state physical activity level of the subject, including identifying for the first time period a first beginning time at which the physical activity of the subject is deemed to be at steady state at the first steady-state physical activity level, and a first ending time at which the subject leaves the first steady-state physical activity level, the first steady-state physical activity level corresponding to an activity bin;
processing the physical activity signal to define a second time period associated with a second steady-state physical activity level of the subject, the second steady-state physical activity level of the subject corresponding to the same activity bin as the first steady-state physical activity level of the subject, including identifying for the second time period a second beginning time at which the physical activity of the subject is deemed to be at steady state at the second steady-state physical activity level, and a second ending time at which the subject leaves the second steady-state physical activity level;
combining data from the other physiological signal also obtained during the first and second time periods; and
using the combined data from the other physiological signal to provide a diagnostic indicator. - View Dependent Claims (15, 16, 17, 18)
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19. A method comprising:
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detecting a plurality of activity levels using an accelerometer;
determining for a candidate activity level an activity level bin value corresponding to a range of activity level values;
determining whether the candidate activity level was at steady state using bin values from activity levels detected before and after the candidate activity level;
if the candidate activity level was at steady state, adding to one or more sum registers physiological data detected contemporaneously with the candidate activity level using an implantable medical device, and incrementing one or more counters;
if the candidate activity level was not at steady state and a previous activity level was at steady state;
averaging the physiological data using the one or more sum registers and one or more counters;
aggregating the averaged physiological data with previous physiological data detected at an activity level corresponding to the same bin value; and
storing aggregated physiological data averages. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification