System method and device for determining the risk of dehydration
Inventors
Assignees
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Publication Number
US-9220444-B2
Publication Date
2015-12-29
Expiration Date
Abstract
A system, device and method of determining the probability of dehydration of a person is provided. In one embodiment, the method comprises receiving data of a heart rate of the person; receiving data of a posture of the person; determining that a first posture of the person satisfies first posture criteria for a first predetermined time period; determining a first heart rate for the person during the first predetermined time period; subsequent to determining that the first posture of the person satisfies first posture criteria for a first predetermined time period, determining that a second posture of the person satisfies second posture criteria for at least a second predetermined period; determining a second heart rate for the person during the second predetermined time period; determining a change in heart rate as the second heart rate minus the first average heart rate; determining a first probability of dehydration based, at least in part, on the change in heart rate; and outputting the first probability of dehydration.
Core Innovation
A method receives heart rate data associated with a heart rate of a person from a first sensor configured to be worn externally on a body of the person, and receives posture data associated with a posture of the person from a second sensor. The method determines that a first posture of the person satisfies a first posture criteria for a first predetermined time period and determines a first heart rate associated with the first predetermined time period.
The method determines that the posture transitions from the first posture to a second posture within a second time period after the first predetermined time period, and, when the length of the second time period is within a predetermined time period, determines that the second posture satisfies a second posture criteria for a third time period. The method determines a second heart rate associated with the third time period and determines a change in heart rate based on a difference between the second heart rate and the first heart rate.
Based on the change in heart rate, the method determines a probability of dehydration. Dependent functionality further includes determining probability using a baseline-normalized change in heart rate and outputting an alert configured to alert the person when the probability of dehydration exceeds a dehydration risk threshold, optionally conditioned on posture-related timing and additional context.
Claims Coverage
The independent claims cover a posture-transition based dehydration-risk determination using externally sourced heart-rate sensor data, with probability estimation from heart-rate change and threshold-based alerting. Across the independent claims, there are 6 main inventive features.
Externally worn heart-rate data with posture data reception
Receiving heart rate data associated with a heart rate of a person from a first sensor configured to be worn externally on a body of the person, and receiving posture data associated with a posture of the person from a second sensor.
Posture criteria satisfaction and posture transition within time periods
Determining that a first posture of the person satisfies a first posture criteria for a first predetermined time period; determining that the posture of the person transitions from the first posture to a second posture within a second time period after the first predetermined time period; and, when the length of the second time period is within a predetermined time period, determining that the second posture satisfies a second posture criteria for a third time period.
First and second heart rate determination for time periods
Determining a first heart rate for the person based on the heart rate data, the first heart rate associated with the first predetermined time period, and determining a second heart rate for the person based on the heart rate data, the second heart rate associated with the third time period.
Heart-rate change from difference between time-period heart rates
Determining a change in heart rate based on a difference between the second heart rate and the first heart rate.
Probability of dehydration based on heart-rate change
Determining a probability of dehydration based, at least in part, on the change in heart rate.
Alert output based on dehydration probability threshold and optional activity level
Output an alert configured to alert the person of the probability of dehydration when the probability of dehydration exceeds a dehydration risk threshold and when the activity level of the person associated with the third time period is below an activity threshold.
The independent claims focus on determining dehydration probability from posture-stability and transition timing paired with externally worn sensor heart-rate data. They further support threshold-based alerting in which dehydration probability is compared to a dehydration risk threshold, optionally gated by an activity threshold.
Stated Advantages
Documented Applications
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