scholarly journals Estimation of heat production from heart-rate measurements in cattle

1979 ◽  
Vol 42 (3) ◽  
pp. 507-513 ◽  
Author(s):  
S. Yamamoto ◽  
J. A. McLean ◽  
A. J. Downie
Keyword(s):  
Heart Rate ◽  
Linear Regression ◽  
Heat Production ◽  
Practical Method ◽  
Accuracy Of Prediction ◽  
The Relationship ◽  
Calibration Equations ◽  
Separate Calibration ◽  
Frequent Measurement ◽  
Better Than

1. Heat production and heart rate of seven steers were measured simultaneously using either a calori- metric 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 from heart rate was better than ±10% in all instances.5. It is concluded that frequent measurement of heart rate appears to offer a practical method for esti- mation of heat production of free-range animals.

scholarly journals Effects of Feed Intake and Behavior on the Relationship between Heart Rate and Heat Production, and the Evaluation of Energy Balance in Holstein Heifers

1993 ◽  
Vol 64 (4) ◽  
pp. 403-410 ◽  
Author(s):  
Takaaki MATSUMOTO ◽  
B. P. PURWANTO ◽  
Fumio NAKAMASU ◽  
Toshio ITO ◽  
Sadaki YAMAMOTO
Keyword(s):  
Heart Rate ◽  
Energy Balance ◽  
Heat Production ◽  
Feed Intake ◽  
And Behavior ◽  
The Relationship

The Relationship Between Prey Size and Handling Time and Prey Size and Capture Success in 3 Sympatric Species of Dasyurid Marsupials

1988 ◽  
Vol 15 (6) ◽  
pp. 615 ◽  
Author(s):  
MC Calver ◽  
JS Bradley ◽  
DR King
Keyword(s):  
Linear Regression ◽  
Prey Size ◽  
Handling Time ◽  
Prey Type ◽  
Sympatric Species ◽  
Niche Separation ◽  
Simple Linear Regression ◽  
Predator Species ◽  
The Relationship ◽  
Better Than

Regressions of handling time on prey weight were determined for the dasyurids Srninthopsis hirtipes, S. ooldea and Ningaui spp. preying on grasshoppers and cockroaches in the laboratory. In all cases, a simple linear regression fitted the relationships better than logarithmic models. The slopes of the regression lines were steeper for grasshopper prey than for cockroach prey in all species, and for each prey type the slopes for the predators were ranked in order of predator weight. Capture efficiency, defined as the proportion of successful attacks, did not vary significantly between predator species and prey types, and all predators showed declining capture efficiencies with increasing prey size. Niche separation in these dasyurids does not appear to be based on different optimal prey sizes for each species.

scholarly journals Corneal Elevation Asymmetry Vector as a Predictor of One-year-averaged Orthokeratology Lens Decentration in Low Astigmats

2021 ◽  
Author(s):  
Qiong Xu ◽  
Kai Wang ◽  
Yan Li ◽  
Jia Qu ◽  
Mingwei Zhao
Keyword(s):  
Linear Regression ◽  
Prospective Study ◽  
Predictive Ability ◽  
Practical Method ◽  
Common Type ◽  
Objective Method ◽  
One Year ◽  
The Relationship

Abstract Significance: This study establishes a novel and practical method for locating orthokeratology lens decentration. The general lens decentration over a one-year period could be partially predicted using the corneal elevation asymmetry vector.Purpose: The predictive ability of the pretreatment corneal elevation asymmetry vector for the average orthokeratology lens decentration in Chinese myopic adolescents with low astigmatism was explored.Methods: Thirty-five myopic participants (35 eyes) were enrolled in this prospective study. The follow-up time was up to one year. Various pretreatment corneal parameters were analyzed to identify potential candidates for lens decentration prediction. An accurate and objective method was developed in MATLAB to calculate the corneal asymmetry vector, which was defined as the sum of the elevation vector at the boundary between the reverse curve and the alignment curve. The program also locates a precise lens decentration vector. The relationship between pretreatment corneal parameters and lens decentration was analyzed using linear regression.Results: Lens decentration stabilized after 1 month. The averaged lens decentration vector was calculated to indicate the general decentration situation after stabilization. The magnitude of the averaged decentration varied from 0.07 mm to 1.35 mm, with 91% measuring less than 1.0 mm. Inferotemporal decentration was the most common type (66%). Among all the pretreatment parameters, only the corneal asymmetry vector significantly correlated with the averaged lens decentration in horizontal coordinates (R=0.374, p=.027). The vertical asymmetry vector was close to significance when correlated with the vertical averaged lens decentration vector (R=0.327, p=.055). The angle of the corneal elevation asymmetry vector significantly contributed to the averaged lens decentration angle (R= 0.344, p= .043).Conclusions: The association between pretreatment corneal elevation asymmetry vector and one-year-averaged orthokeratology lens decentration may assist in fitting and understanding the performance of orthokeratology lenses.

scholarly journals The Relationship between Heart Rate and Heat Production of Dairy Cows in Prepartum and Postpartum

1983 ◽  
Vol 54 (9) ◽  
pp. 497-501 ◽  
Author(s):  
Koki FUKUHARA ◽  
Toshiaki SAWAI ◽  
Sadaki YAMAMOTO
Keyword(s):  
Heart Rate ◽  
Dairy Cows ◽  
Heat Production ◽  
The Relationship

Can the Point of Deflection from Linearity of Heart Rate Determine Ventilatory Threshold in Children?

1991 ◽  
Vol 3 (3) ◽  
pp. 256-262 ◽  
Author(s):  
Anthony D. Mahon ◽  
Paul Vaccaro
Keyword(s):  
Heart Rate ◽  
Regression Analysis ◽  
Linear Regression ◽  
Ventilatory Threshold ◽  
Linear Regression Analysis ◽  
Accurate Predictor ◽  
Graded Exercise Test ◽  
Significant Difference ◽  
Graded Exercise ◽  
The Relationship

Whether the point of deflection from linearity of heart rate (HRD) coincides with ventilatory threshold (VT) has not been extensively examined in children. The purpose of this study was to assess the relationship between the VO2 measured at VT and the VO2 measured at HRD. Twenty-two boys with a mean age of 10.7 years (±1.0) performed a graded exercise test to determine VT, HRD, and VO2max. There was no significant difference between mean VO2 (ml/kg/min) at VT and at HRD (33.5±3.5 vs. 34.1±4.4; p>0.05). Linear regression analysis revealed a correlation of r = 0.76 (p<0.01) between the VO2 measured at VT and the VO2 measured at HRD. These results indicate that HRD may be an accurate predictor of VT in most but not all children, and caution should be used when interpreting the significance of HRD.

scholarly journals Studies on the Relationship between Heart Rate and Heat Production of Dairy Steers, as Compared with the Results of Dairy Bull Calves

1977 ◽  
Vol 48 (3) ◽  
pp. 138-143
Author(s):  
Sadaki YAMAMOTO ◽  
Kunihiro MATSUOKA ◽  
Hidetoshi YAMADA ◽  
Ko MIMURA
Keyword(s):  
Heart Rate ◽  
Heat Production ◽  
Bull Calves ◽  
Dairy Bull ◽  
The Relationship

scholarly journals The Relationship between Heart Rate and Heat Production of Growing Pigs

1984 ◽  
Vol 55 (6) ◽  
pp. 394-398
Author(s):  
Koki FUKUHARA ◽  
Sadaki YAMAMOTO
Keyword(s):  
Heart Rate ◽  
Heat Production ◽  
Growing Pigs ◽  
The Relationship
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