Functional Data Analysis of Core Body Temperature in Response to Environmental Heat Stress

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Vicki Hertzberg* ◽  
Lisa Elon ◽  
Valerie Mac ◽  
Abby Mutic ◽  
Katherine Peterman ◽  
...  
Keyword(s):  
Heat Stress ◽  
Data Analysis ◽  
Body Temperature ◽  
Functional Data Analysis ◽  
Functional Data ◽  
Core Body Temperature ◽  
Core Body

scholarly journals Genetic parameters for hair characteristics and core body temperature in a multibreed Brahman–Angus herd1

2019 ◽  
Vol 97 (8) ◽  
pp. 3246-3252 ◽  
Author(s):  
Kaitlyn M Sarlo Davila ◽  
Heather Hamblen ◽  
Peter J Hansen ◽  
Serdal Dikmen ◽  
Pascal A Oltenacu ◽  
...  
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Genetic Parameters ◽  
Core Body Temperature ◽  
Cattle Breed ◽  
Measuring Device ◽  
Hair Samples ◽  
Diameter Core ◽  
Humidity Index ◽  
Core Body

Abstract Thermal stress in hot humid conditions limits cattle production. The objectives for this study were to estimate genetic parameters for hair characteristics and core body temperature under low and high temperature humidity index (THI) conditions. Hair samples were collected and measured for length and diameter. Core body temperature was measured as vaginal temperature every 15 min over a 5-d period using an iButton temperature measuring device implanted in a blank CIDR in 336 heifers from the University of Florida multibreed herd (ranging from 100% Angus to 100% Brahman). Restricted maximum likelihood procedures were used to estimate heritabilities from multiple bivariate animal models using the WOMBAT program. Estimates of heritability for hair diameter, undercoat length, topcoat length, body temperature under low THI conditions, and body temperature under high THI conditions were 0.50, 0.67, 0.42, 0.32, and 0.26, respectively. The genetic parameters estimated in this study indicate a large, exploitable genetic variance which can be selected upon to improve tolerance in cattle. Breed effects for differing compositions of Brahman and Angus were also estimated. As Brahman breed composition increased by 25% undercoat length, topcoat length, body temperature under low THI conditions, and body temperature under high THI conditions decreased by 1.32 mm, 2.94 mm, 0.11 °C, and 0.14 °C, respectively. Under both low and high THI conditions, cattle with 25% Brahman breed composition or greater maintained a significantly lower body temperature than the 100% Angus breed group. The incorporation of Brahman germplasm is recommended for herds that often experience heat stress conditions in order to increase resilience to heat stress.

scholarly journals Novel Analytic Methods Needed for Real-Time Continuous Core Body Temperature Data

2016 ◽  
Vol 39 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Vicki Hertzberg ◽  
Valerie Mac ◽  
Lisa Elon ◽  
Nathan Mutic ◽  
Abby Mutic ◽  
...  
Keyword(s):  
Data Analysis ◽  
Body Temperature ◽  
Real Time ◽  
Time Course ◽  
Core Body Temperature ◽  
Heat Exposure ◽  
Threshold Limit Value ◽  
Limit Value ◽  
Novel Approach ◽  
Core Body

Affordable measurement of core body temperature (Tc) in a continuous, real-time fashion is now possible. With this advance comes a new data analysis paradigm for occupational epidemiology. We characterize issues arising after obtaining Tc data over 188 workdays for 83 participating farmworkers, a population vulnerable to effects of rising temperatures due to climate change. We describe a novel approach to these data using smoothing and functional data analysis. This approach highlights different data aspects compared with describing Tc at a single time point or summaries of the time course into an indicator function (e.g., did Tc ever exceed 38 °C, the threshold limit value for occupational heat exposure). Participants working in ferneries had significantly higher Tc at some point during the workday compared with those working in nurseries, despite a shorter workday for fernery participants. Our results typify the challenges and opportunities in analyzing Big Data streams from real-time physiologic monitoring.

The effects of heat stress on cognition in persons with multiple sclerosis

2011 ◽  
Vol 18 (4) ◽  
pp. 489-497 ◽  
Author(s):  
P Hämäläinen ◽  
A Ikonen ◽  
A Romberg ◽  
H Helenius ◽  
J Ruutiainen
Keyword(s):  
Multiple Sclerosis ◽  
Heat Stress ◽  
Body Temperature ◽  
Cognitive Functioning ◽  
Cognitive Deficits ◽  
Core Body Temperature ◽  
Heat Exposure ◽  
Heat Sensitivity ◽  
Serial Addition ◽  
Core Body

Background: Heat sensitivity and cognitive deficits are typical manifestations of multiple sclerosis (MS). Although cognitive deficits are quite well characterized, practically no data exist on the effects of heat on cognitive performances in MS. Objective: To assess the effects of short-term heat stress on cognitive functioning in subjects with MS. Methods: A total of 23 heat-sensitive MS and 19 healthy control (HC) subjects participated. Moderate heat exposure took place in a Finnish sauna. Cognitive functioning was measured with tests of sustained attention and processing speed, the Paced Auditory Serial Addition Test (PASAT 3” and 2”) and the computerized visual vigilance test, before, during and after heat exposure. Results: During the heat exposure, the core body temperature of the MS group rose significantly more ( p = 0.002) than that of the HC group. The heat stress worsened the performance of the MS group in the PASAT 3” ( p = 0.025) but not in the other cognitive measures. The performance in the PASAT 3” was reversed almost to the baseline level only 1- h after the heat exposure. Conclusions: A significant increase in core body temperature during heat stress is associated with a mild and reversible worsening of the PASAT 3” performance, while visual vigilance performance seems to remain almost unaffected.

Sign in / Sign up

Export Citation Format

Share Document