Performance testing of an innovative telemetric temperature sensor in animals

Chapon, P.-A.; Bessot, Nicolas; Gauthier, Antoine; Besnard, S.; Moussay, Sébastien

doi:10.1016/j.jtherbio.2011.08.004

Cited by 9 publications

(9 citation statements)

References 12 publications

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“…This level of difference cannot be explained by technical reasons; thus extreme values might rather be explained by behavioral factors such as food or water intake, as shown previously. 23 The sensor location significantly affects the mean and median temperature values but the intra-sensor variability level was similar (standard previously reported. 24 Thus, temperature kinetics, and both maximal and minimal values reached were similar for the LH, RIF and Free sensors.…”

Section: Discussionsupporting

confidence: 84%

“…The other two were attached in the IP cavity with non-resorbable sutures, respectively in the left hypochondrium (LH capsule) and the right iliac fossa (RIF capsule). As previously described by Chapon et al, 23 isoflurane (3%, O 2 flow rate ¼2 L/min; maintained at 2%, O 2 flow rate ¼3 L/min) was used for the surgical procedure. For two days, each rat received a dose of proparacetamol (Perfalgan; Bristol-Myers Squibb Rueil-Malmaison, France) intraperitoneally (25 mg in 1 mL of saline solution) in order to decrease nociception caused by the laparotomy.…”

Section: Methodsmentioning

confidence: 99%

“…21,22 Furthermore, a mean absolute difference of AE0.17 C has previously been reported between nonattached sensors implanted intraperitoneally in rats. 23 The authors hypothesized that the rodents' activities such as food/water intake and locomotion/sleep could affect each sensor differently depending on its location. 23 To our knowledge, no study has focused on the possible impact of sensor location within rats' IP cavities on temperature values collected.…”

mentioning

confidence: 99%

“…23 The authors hypothesized that the rodents' activities such as food/water intake and locomotion/sleep could affect each sensor differently depending on its location. 23 To our knowledge, no study has focused on the possible impact of sensor location within rats' IP cavities on temperature values collected. In their studies, Green et al 21 and Deveney et al 22 have proposed IP device implantation without precisely indicating the fixation site used.…”

mentioning

confidence: 99%

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On the importance of telemetric temperature sensor location during intraperitoneal implantation in rats

et al. 2014

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This study aims to assess the thermal homogeneity of the intraperitoneal (IP) cavity and the relevance of using a fixed telemetric temperature sensor at a given location in studying rodents. Ten rats were intraperitoneally implanted with three Jonah® capsules each; after assessing the accuracy and reliability of the sensors. Two capsules were attached, one to the right iliac fossa (RIF) and the other to the left hypochondrium (LH), and another was placed between the intestines but not attached (Free). In the ex vivo condition, the differences between sensors and reference values remained in the range of ±0.1. In the in vivo condition, each sensor enabled the observation of temperature patterns. However, sensor location affected mean and median temperature values while the rats were moving freely. Indeed, temperature data collected in the LH were 0.1 significantly higher than those collected in the RIF and temperature data collected in the LH were 0.11 significantly higher than those collected with the Free capsules. In in vivo conditions, intra-sensor variability of temperature data was not affected by sensor location. Taking into account sensor accuracy, similar intra-sensor variability, and mean differences observed between the three locations, the impact of sensor location within the IP cavity could be considered negligible. In in vivo conditions, temperature differences between locations regularly exceeded ±0.2 and reached up to 2.5. These extreme values could be explained by behavioral factors such as food or water intake. Finally, considering the good thermal homogeneity of the IP cavity and possible adverse consequences of sensor attachment, it seems better to let sensors range free within the cavity.

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Section: Discussionsupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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On the importance of telemetric temperature sensor location during intraperitoneal implantation in rats

et al. 2014

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“…Previous studies show the capsules meet standard electrical thermometry performance requirements 8 and have yielded similar results when compared to existing implantable telemetry systems in rats. 9 Despite this, intestinal temperature profiles typically display slower responses to rapid body temperature changes in humans when compared to other measurement sites (i.e. pulmonary artery or esophagus) used in clinical settings.…”

Section: Introductionmentioning

confidence: 99%

Validation of an ingestible temperature data logging and telemetry system during exercise in the heat

et al. 2016

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Aim: Intestinal temperature telemetry systems are promising monitoring and research tools in athletes. However, the additional equipment that must be carried to continuously record temperature data limits their use to training. The purpose of this study was to assess the validity and reliability of a new gastrointestinal temperature data logging and telemetry system (e-Celsius™) during water bath experimentation and exercise trials. Materials and Methods: Temperature readings of 23 pairs of e-Celsius (TeC) and VitalSense (TVS) ingestible capsules were compared to rectal thermistor responses (Trec) at 35, 38.5 and 42°C in a water bath. Devices were also assessed in vivo during steady-state cycling (n = 11) and intermittent running (n = 11) in hot conditions. Results: The water bath experiment showed TVS and TeC under-reported Trec (P<0.001). This underestimation of Trec also occurred during both cycling (mean bias vs TVS: 0.21°C, ICC: 0.84, 95% CI: 0.66–0.91; mean bias vs. TeC: 0.44°C, ICC: 0.68, 95% CI: 0.07–0.86, P<0.05) and running trials (mean bias vs. TVS: 0.15°C, ICC: 0.92, 95% CI: 0.83–0.96; mean bias vs. TeC: 0.25, ICC: 0.86, 95% CI: 0.61–0.94, P<0.05). However, calibrating the devices attenuated this difference during cycling and eliminated it during running. During recovery following cycling exercise, TeC and TVS were significantly lower than Trec despite calibration (P<0.01). Conclusion: These results indicate that both TeC and TVS under-report Trec during steady-state and intermittent exercise in the heat, with TeC predicting Trec with the least accuracy of the telemetry devices. It is therefore recommended to calibrate these devices at multiple temperatures prior to use.

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Theoretical and Experimental Studies of Epidermal Heat Flux Sensors for Measurements of Core Body Temperature

Zhang

Webb

Luo

et al. 2015

Adv Healthcare Materials

106

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Long-term, continuous measurement of core body temperature is of high interest, due to the widespread use of this parameter as a key biomedical signal for clinical judgment and patient management. Traditional approaches rely on devices or instruments in rigid and planar forms, not readily amenable to intimate or conformable integration with soft, curvilinear, time-dynamic, surfaces of the skin. Here, materials and mechanics designs for differential temperature sensors are presented which can attach softly and reversibly onto the skin surface, and also sustain high levels of deformation (e.g., bending, twisting, and stretching). A theoretical approach, together with a modeling algorithm, yields core body temperature from multiple differential measurements from temperature sensors separated by different effective distances from the skin. The sensitivity, accuracy, and response time are analyzed by finite element analyses (FEA) to provide guidelines for relationships between sensor design and performance. Four sets of experiments on multiple devices with different dimensions and under different convection conditions illustrate the key features of the technology and the analysis approach. Finally, results indicate that thermally insulating materials with cellular structures offer advantages in reducing the response time and increasing the accuracy, while improving the mechanics and breathability.

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Performance testing of an innovative telemetric temperature sensor in animals

Cited by 9 publications

References 12 publications

On the importance of telemetric temperature sensor location during intraperitoneal implantation in rats

On the importance of telemetric temperature sensor location during intraperitoneal implantation in rats

Validation of an ingestible temperature data logging and telemetry system during exercise in the heat

Theoretical and Experimental Studies of Epidermal Heat Flux Sensors for Measurements of Core Body Temperature

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