Environmental impact on CBT measurements. The low outdoor temperature and the cold wind blow
ing against the runners may have had a dual impact on the CBT measurements. On the one hand, they may have caused a physiologic drop of tympanic CBT due to the cold blood flow from the face to the inner ear. Medical researchers have indeed studied the response of tympanic CBT to environmental temperature variations by artificially applying a cold stimulus on the face [25], [26] or by keeping subjects into cold or hot thermal chambers [23], and experienced CBT variations higher than 0.5◦C. On the other hand, despite the use of earbags to shield the inner ear, external airflow and wind may have generated temperature gradients inside the thermopile packaging. To better understand whether the CBT fluctuations were due to a physiological change in tympanic temperature, to a sensor inaccuracy, or to both, we have observed the CBT fluctuations at two specific points of the Marathon track and related them to the environmental temperature. In the first half of the Marathon, the runners were facing the cold wind coming from the coast. At half Marathon, the runners turned back and returned along the same path to the finish line without facing wind anymore. As soon as they passed the turning point, the environmental temperature suddenly rose, whereas CBT started to gradually increase in the following minutes, as can be seen in Fig. 6 (top). We conjecture that this increase in CBT is physiological, as it is gradual, and as it is likely that the absence of direct wind on the runners limited the body cooling and hence increased the CBT. We have also analysed the CBT of the runners while entering the 780 metre-long “Herren Tunnel” underneath the river Trave. Fig. 6 (bottom) shows that the fluctuations of CBT and environmental temperature while entering and exiting the tunnel are strongly correlated, possibly because of the airflow cooling down the runners’ body.
สิ่งแวดล้อมกับชุมชนวัด อุณหภูมิภายนอกต่ำและเป่าลมเย็นing against the runners may have had a dual impact on the CBT measurements. On the one hand, they may have caused a physiologic drop of tympanic CBT due to the cold blood flow from the face to the inner ear. Medical researchers have indeed studied the response of tympanic CBT to environmental temperature variations by artificially applying a cold stimulus on the face [25], [26] or by keeping subjects into cold or hot thermal chambers [23], and experienced CBT variations higher than 0.5◦C. On the other hand, despite the use of earbags to shield the inner ear, external airflow and wind may have generated temperature gradients inside the thermopile packaging. To better understand whether the CBT fluctuations were due to a physiological change in tympanic temperature, to a sensor inaccuracy, or to both, we have observed the CBT fluctuations at two specific points of the Marathon track and related them to the environmental temperature. In the first half of the Marathon, the runners were facing the cold wind coming from the coast. At half Marathon, the runners turned back and returned along the same path to the finish line without facing wind anymore. As soon as they passed the turning point, the environmental temperature suddenly rose, whereas CBT started to gradually increase in the following minutes, as can be seen in Fig. 6 (top). We conjecture that this increase in CBT is physiological, as it is gradual, and as it is likely that the absence of direct wind on the runners limited the body cooling and hence increased the CBT. We have also analysed the CBT of the runners while entering the 780 metre-long “Herren Tunnel” underneath the river Trave. Fig. 6 (bottom) shows that the fluctuations of CBT and environmental temperature while entering and exiting the tunnel are strongly correlated, possibly because of the airflow cooling down the runners’ body.
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