Multi Regression Analysis of Skin Temperature Variation During Cycling Exercise

2017 ◽  
pp. 962-969
Author(s):  
Jose Ignacio Priego Quesada ◽  
Rosario Salvador Palmer ◽  
Pedro Pérez-Soriano ◽  
Joan Izaguirre ◽  
Rosa Mª Cibrián Ortiz de Anda
Keyword(s):  
Regression Analysis ◽  
Skin Temperature ◽  
Temperature Variation ◽  
Cycling Exercise

Reflex regulation of sweat rate by skin temperature in exercising humans

1984 ◽  
Vol 56 (5) ◽  
pp. 1283-1288 ◽  
Author(s):  
J. M. Johnson ◽  
D. S. O'Leary ◽  
W. F. Taylor ◽  
M. K. Park
Keyword(s):  
Blood Flow ◽  
Regression Analysis ◽  
Linear Regression ◽  
Skin Temperature ◽  
Sweat Rate ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Esophageal Temperature ◽  
Reflex Regulation ◽  
Forearm Skin

To find whether sweat rate (SR) and forearm skin blood flow ( SkBF ) were reflexly affected by skin temperature (Tsk) we used water-perfused suits to rapidly elevate Tsk during exercise. With this elevation in Tsk, there was a period of little net change in esophageal temperature (Tes) but marked responses in SR and SkBF . During this period a rise in Tsk of 4.2 +/- 0.3 degrees C was associated with an increase in SR of 0.44 +/- 0.09 mg X cm-2 X min-1 and an increase in SkBF of 3.27 +/- 0.42 ml X 100 ml-1 X min-1. Multiple linear regression analysis as well as comparison with control studies in which Tsk was kept cool also reveal a consistent role for Tsk in the reflex regulation of SR and SkBF . Responses in SR and FBF were much more marked at levels of Tsk below 33 degrees C. Below a Tsk of 33 degrees C, SR rose 0.30 +/- 0.06 mg X cm-2 X min-1 per degrees C rise in Tsk, whereas above 33 degrees SR rose only 0.05 +/- 0.01 mg X cm2 X min per degrees C. FBF rose 2.81 +/- 0.60 and 0.77 +/- 0.18 ml X 100 ml-1 X min-1 per degrees C rise in Tsk at the lower and upper ranges of Tsk, respectively.

scholarly journals Occupational Risk Evaluation through Infrared Thermography: Development and Proposal of a Rapid Screening Tool for Risk Assessment Arising from Repetitive Actions of the Upper Limbs

2020 ◽  
Vol 17 (10) ◽  
pp. 3390
Author(s):  
André Luiz Soares ◽  
Antonio Augusto de Paula Xavier ◽  
Ariel Orlei Michaloski
Keyword(s):  
Risk Analysis ◽  
Skin Temperature ◽  
Temperature Variation ◽  
Musculoskeletal Disorders ◽  
Screening Tool ◽  
Risk Level ◽  
Upper Limbs ◽  
Work Related ◽  
Work Related Musculoskeletal Disorders ◽  
Forearm Skin

Risk analysis is one of the main tools for preventing the occurrence of Work-Related Musculoskeletal Disorders. New methods of risk analysis should seek to be more agile and simplified, encouraging them to be widely applied in work environments. This paper aimed to develop a rapid tool for assessing the risk of developing Work-Related Musculoskeletal Disorders (WMSDs) arising from repetitive actions of the upper limbs, while using a thermographic camera to measure skin temperature variation. A workstation was developed in an environmentally controlled laboratory, representing the five levels of risk presented by the Occupational Repetitive Actions Index (OCRA) Index, which were performed by 32 participants for 20 min. each level. There was a significant change in forearm skin temperature at all risk levels (p < 0.001), with a positive linear correlation (r = 0.658 and p < 0.001), which led the authors to perform linear regression analysis for the forearm region. The Predicted OCRA Index calculation equation was successfully developed (R = 0.767 and R² = 0.588), while using as independent variables: air temperature and temperature variation of the forearm skin. The Predicted OCRA Index can be applied as a screening tool for large numbers of workers in the same company or sector, due to its speed of application and the determination of risk level, but it does not replace the original OCRA Index.

Monitoring intraoperative effectiveness of caudal analgesia through skin temperature variation

2003 ◽  
Vol 38 (3) ◽  
pp. 386-389 ◽  
Author(s):  
P.F. Ehrlich ◽  
G. Vedulla ◽  
N. Cottrell ◽  
P.A. Seidman
Keyword(s):  
Skin Temperature ◽  
Temperature Variation ◽  
Caudal Analgesia

scholarly journals Plantar Pressure and Foot Temperature Responses to Acute Barefoot and Shod Running

2015 ◽  
Vol 16 (3) ◽  
Author(s):  
Jose Ignacio Priego Quesada ◽  
Marcos R. Kunzler ◽  
Emmanuel S. da Rocha ◽  
Álvaro S. Machado ◽  
Felipe P. Carpes
Keyword(s):  
Skin Temperature ◽  
Skin Friction ◽  
Temperature Variation ◽  
Plantar Pressure ◽  
Barefoot Running ◽  
Pressure Mapping ◽  
Mapping System ◽  
Higher Temperature ◽  
Recreational Runners ◽  
Temperature Responses

AbstractPurpose. Increased contact pressure and skin friction may lead to higher skin temperature. Here, we hypothesized a relationship between plantar pressure and foot temperature. To elicit different conditions of stress to the foot, participants performed running trials of barefoot and shod running. Methods. Eighteen male recreational runners ran shod and barefoot at a self-selected speed for 15 min over different days. Before and immediately after running, plantar pressure during standing (via a pressure mapping system) and skin temperature (using thermography) were recorded. Results. No significant changes were found in plantar pressure after barefoot or shod conditions (p > 0.9). Shod running elicited higher temperatures in the forefoot (by 0.5-2.2°C or 0.1-1.2% compared with the whole foot, p < 0.01) and midfoot (by 0.9-2.4°C, p < 0.01). Barefoot running resulted in higher temperature variation in the rearfoot (0.1-10.4%, p = 0.04). Correlations between skin temperature and plantar pressure were not significant (r < 0.5 and r > -0.5, p > 0.05). Conclusions. The increase in temperature after the shod condition was most likely the result of footwear insulation. However, variation of the temperature in the rearfoot was higher after barefoot running, possible due to a higher contact load. Changes in temperature could not predict changes in plantar pressure and vice-versa.

Influence of Thermoregulatory Vasomotion and Ambient Temperature Variation on the Accuracy of Core-temperature Estimates by Cutaneous Liquid-crystal Thermometers

1997 ◽  
Vol 86 (3) ◽  
pp. 603-612 ◽  
Author(s):  
Takehiko Ikeda ◽  
Daniel I. Sessler ◽  
Danielle Marder ◽  
Junyu Xiong
Keyword(s):  
Liquid Crystal ◽  
Ambient Temperature ◽  
Skin Temperature ◽  
Temperature Variation ◽  
Core Temperature ◽  
Temperature Difference ◽  
Capillary Flow ◽  
The Core ◽  
Neck Temperature ◽  
Body Heat

Background Recently, liquid crystal skin-surface thermometers have become popular for intraoperative temperature monitoring. Three situations during which cutaneous liquid-crystal thermometry may poorly estimate core temperature were monitored: (1) anesthetic induction with consequent core-to-peripheral redistribution of body heat, (2) thermoregulatory vasomotion associated with sweating (precapillary dilation) and shivering (minimal capillary flow), and (3) ambient temperature variation over the clinical range from 18-26 degrees C. Methods The core-to-forehead and core-to-neck temperature difference was measured using liquid-crystal thermometers having an approximately 2 degrees C offset. Differences exceeding 0.5 degree C (a 1 degree C) temperature range) were a priori deemed potentially clinically important. Seven volunteers participated in each protocol. First, core-to-peripheral redistribution of body heat was produced by inducing propofol/desflurane anesthesia; anesthesia was then maintained for 1 h with desflurane. Second, vasodilation was produced by warming unanesthetized volunteers sufficiently to produce sweating; intense vasoconstriction was similarly produced by cooling the volunteers sufficiently to produce shivering. Third, a canopy was positioned to enclose the head, neck, and upper chest of unanesthetized volunteers. Air within the canopy was randomly set to 18, 20, 22, 24, and 26 degrees C. Results Redistribution of body heat accompanying induction of anesthesia had little effect on the core-to-forehead skin temperature difference. However, the core-to-neck skin temperature gradient decreased approximately 0.6 degree C in the hour after induction of anesthesia. Vasomotion associated with shivering and mild sweating altered the core-to-skin temperature difference only a few tenths of a degree centigrade. The absolute value of the core-to-forehead temperature difference exceeded 0.5 degree C during approximately 35% of the measurements, but the difference rarely exceeded 1 degree C. The core-to-neck temperature difference typically exceeded 0.5 degree C and frequently exceeded 1 degree C. Each 1 degree C increase in ambient temperature decreased the core-to-fore-head and core-to-neck skin temperature differences by less than 0.2 degree C. Conclusions Forehead skin temperatures were better than neck skin temperature at estimating core temperature. Core-to-neck temperature differences frequently exceeded 1 degree C (a 2 degrees C range), whereas two thirds of the core-to-forehead differences were within 0.5 degree C. The core-to-skin temperature differences were, however, only slightly altered by inducing anesthesia, vasomotor action, and typical intraoperative changes in ambient temperature.

scholarly journals Reliability of protonation constants of vildagliptin dimers by the regression analysis of pH-titration data

2013 ◽  
Vol 11 (7) ◽  
pp. 1101-1111 ◽  
Author(s):  
Milan Meloun ◽  
Zuzana Ferenčíková ◽  
Irena Niesnerová ◽  
Tomáš Pekárek
Keyword(s):  
Regression Analysis ◽  
Systematic Error ◽  
Temperature Variation ◽  
Goodness Of Fit ◽  
Formation Constants ◽  
Protonation Constants ◽  
Parameter Estimates ◽  
Regression Diagnostics ◽  
Ph Titration ◽  
Titration Data

AbstractProtonation constants of protonated monomers and dimers of the vildagliptin are determined potentiometrically. For the low concentration c L = 3.3 mmol dm−3 the monomers L and LH dominate, while for a higher concentration c L = 6.3 mmol dm−3 the dimers L2H2, L2H3, L2H4 and L2H are mainly present. The algorithm used has little influence on the precision of the formation constants in comparison with the reproducibility of the titration. The mixed protonation constants of vildagliptin dimers Lq Hr at various temperatures are determined using FBSTAC4 and HYPERQUAD regression analysis of the potentiometric titration data. The accuracy of the protonation constants log10 βqr depends on the accuracy of the group parameters. As two group parameters L 0, H T are ill conditioned in a model, their determination is therefore uncertain; both can significantly cause a systematic error in the estimated common parameters log10 βqr . Using various regression diagnostics the goodness-of-fit proves the reliability of all parameter estimates. A rough estimation of thermodynamic enthalpies ΔH 0 (kJ mol−1) and entropies ΔS 0 (J K−1 mol−1) is determined from the temperature variation of protonation constants. The enthalpy shows the protonation process is exothermic, and the entropy indicates that it is spontaneous.

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