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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
Special considerations while measuring pulse01:13

Special considerations while measuring pulse

Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:

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Related Experiment Video

Updated: Jul 3, 2026

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
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Heart rate detection from an electronic weighing scale.

R González-Landaeta1, O Casas, R Pallàs-Areny

  • 1Instrumentation, Sensors and Interfaces Group, EPSC, Universitat Politècnica de Catalunya, Barcelona, Spain. rgonzalez@eel.upc.edu

Physiological Measurement
|July 22, 2008
PubMed
Summary

This study introduces a new method for detecting heart rate using a regular electronic weighing scale to measure ballistocardiographic (BCG) signals. This non-contact technique accurately estimates heart rate by sensing subtle force variations from blood flow.

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Area of Science:

  • Biomedical Engineering
  • Physiological Monitoring
  • Signal Processing

Background:

  • Traditional heart rate monitoring often requires wearable sensors.
  • Ballistocardiography (BCG) measures body vibrations caused by cardiac activity.
  • Existing BCG methods may require specialized equipment or body-attached sensors.

Purpose of the Study:

  • To develop and validate a novel, non-contact method for beat-to-beat heart rate detection.
  • To utilize the ballistocardiographic (BCG) force signal obtained from a standard electronic weighing scale.
  • To assess the feasibility of using load cells in weighing scales for physiological monitoring.

Main Methods:

  • Characterized the sensitivity and frequency response of three commercial weighing scales for BCG signal detection.
  • Designed an electronic pulse detection system using off-the-shelf integrated circuits.
  • Recorded BCG signals from subjects standing on the weighing scale.
  • Compared RR time intervals derived from BCG and electrocardiography (ECG) using Bland-Altman analysis.

Main Results:

  • Weighing scales demonstrated adequate sensitivity (490–1670 nV V⁻¹ N⁻¹) and frequency response for heart rate estimation.
  • The system detected heart-beat-related force variations of approximately 0.24 N with a signal-to-noise ratio exceeding 30 dB.
  • Bland-Altman analysis showed a mean error of +/-21 ms between BCG and ECG derived RR intervals in 17 volunteers.

Conclusions:

  • A novel, non-contact heart rate detection technique based on weighing scale BCG signals is feasible.
  • The proposed method is accurate enough for short-term heart rate monitoring.
  • This approach offers a convenient and accessible alternative to traditional heart rate monitoring methods.