Estimation of heat production from heart-rate measurements in cattle

Estimation of heat production from heart-rate measurements in cattle.

1. Heat production and heart rate of seven steers were measured simultaneously using either a calorimetric chamber or head-cage. 2. The relationship between heat production and heart rate for each animal was best described by linear regression. 3. Differences between individual animals made separate 'calibration equations' necessary for each animal. 4. Accuracy of prediction of heat production ...

Dynamic heart rate measurements from video sequences.

This paper shows how dynamic heart rate measurements that are typically obtained from sensors mounted near to the heart can also be obtained from video sequences. In this study, two experiments are carried out where a video camera captures the facial images of the seven subjects. The first experiment involves the measurement of subjects' increasing heart rates (79 to 150 beats per minute (BPM))...

Rapid estimation of sunflower leaf area from linear measurements

Unsupervised Heart Rate Variability Estimation from Ballistocardiograms

We propose and evaluate an unsupervised method for the estimation of heart rate variability (HRV) indices from ballistocardiograms (BCGs) recorded by a bed-mounted, electromechanical film (EMFi) sensor during sleep. After estimating the beat-to-beat intervals from the BCGs, short-term timeand frequency-domain HRV indices are computed and compared to an ECG reference. We evaluated signals record...

Heart Beat Rate Estimation from Video

The thesis describes an implementation of a method estimating the heart beat rate based on an analysis of the color changes measured in a video of a human face. We use a 3D facial landmark tracker that allows to extract a stable region on a face needed to acquire a robust measurement of the color changes. A simple model is proposed to approximate a linear projection of the color signal by sinus...