A Novel Model to Predict Cutaneous Finger Blood Flow via Finger and Rectal Temperatures

Carrillo, Andres E.; Cheung, Stephen S.; Flouris, Andreas D.

doi:10.1111/j.1549-8719.2011.00136.x

Cited by 12 publications

(15 citation statements)

References 19 publications

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“…Nevertheless, incorporating the change in iDISK allowed us to generate environment-independent equations, resulting in increased practicality. The present successful employment of lag data to correct for response delays in surface temperature measurements supports previous usage of this technique by our group (6,14). More importantly, having prediction equations with lag data does not add significant complexity to the proposed method (e.g., processing the data through a software package); …”

Section: Discussionsupporting

confidence: 78%

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Noninvasive assessment of muscle temperature during rest, exercise, and postexercise recovery in different environments

Flouris

Webb²,

Kenny

2015

Journal of Applied Physiology

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Flouris AD, Webb P, Kenny GP. Noninvasive assessment of muscle temperature during rest, exercise, and postexercise recovery in different environments. J Appl Physiol 118: 1310-1320, 2015. First published March 26, 2015 doi:10.1152/japplphysiol.00932.2014.-We introduced noninvasive and accurate techniques to estimate muscle temperature (Tm) of vastus lateralis (VL), triceps brachii (TB), and trapezius (TRAP) during rest, exercise, and postexercise recovery using the insulation disk (iDISK) technique. Thirty-six volunteers (24 men, 12 women; 73.0 Ϯ 12.2 kg; 1.75 Ϯ 0.07 m; 24.4 Ϯ 5.5 yr; 49.2 Ϯ 6.8 ml·kg Ϫ1 ·min Ϫ1 peak oxygen uptake) underwent periods of rest, cycling exercise at 40% of peak oxygen uptake, and postexercise recovery in three environments: Normal (24°C, 56% relative humidity), Hot-Humid (30°C, 60% relative humidity), and Hot-Dry (40°C, 24% relative humidity). Participants were randomly allocated into the "model" and the "validation" groups. Stepwise regression analysis generated models that accurately predicted Tm (predTm) of VL (R 2 ϭ 0.73-0.91), TB (R 2 ϭ 0.85-0.93), and TRAP (R 2 ϭ 0.84 -0.86) using iDISK and the difference between the current iDISK temperature and that recorded between 1 and 4 min before. Cross-validation analyses in the validation group demonstrated small differences (P Ͻ 0.05) of no physiological significance, small effect size of the differences, and strong associations (r ϭ 0.85-0.97; P Ͻ 0.001) between Tm and predTm. Moreover, narrow 95% limits of agreement and low percent coefficient of variation were observed between Tm and predTm. It is concluded that the developed noninvasive, practical, and inexpensive techniques provide accurate estimations of VL, TB, and TRAP Tm during rest, cycling exercise, and postexercise recovery. intramuscular; insulation disk; vastus lateralis; triceps brachii; trapezius DURING EXERCISE, LARGE AMOUNTS of heat are produced in the exercising muscles, leading to increased muscle temperature (Tm) (22). This occurs within the first few seconds of repeated muscle contraction, confirming that Tm is a robust indicator of muscle metabolism. In this light, the strong link between Tm and exercise performance is not surprising. Indeed, a number of studies have shown that Tm is the most important factor in determining the outcome of exercise performance, especially during short-term high-intensity exercise (36 -38, 41). In addition, a 2-5% variation (depending on the contraction type and velocity) in performance has been proposed as a consequence of a change in Tm by 1°C (41). Therefore, knowledge of Tm during work and exercise is crucial to attain performance enhancements. In addition, Tm data have both clinical [in terms of assessing and refining postexercise recovery interventions (39)] and physiological [in terms of improving the assessment of thermometrically derived mean body temperature (26)] value, representing a much-needed source of information in human physiology.At present, measurement of Tm is a time-consuming, invasive, and expensive techniq...

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Section: Discussionsupporting

confidence: 78%

“…These variables were also evaluated as potential valuable indicators and are henceforth referred to as "lag" (iDISK lag). This methodology was previously used by our group to derive accurate noninvasive estimations of finger blood flow from finger temperature (6,14).…”

Section: Data Preparationmentioning

confidence: 99%

Noninvasive assessment of muscle temperature during rest, exercise, and postexercise recovery in different environments

Flouris

Webb²,

Kenny

2015

Journal of Applied Physiology

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“…Finally, while the skin temperatures recorded may have been partly influenced by the cold water, the fact that a 14‐min period was necessary for MT sk to reach a nadir – which was 8–12 °C higher than the water temperature – confirms that the direct effect of water temperature was minimal. Moreover, recording skin temperature during CWI is a standardized technique that has been employed in a number of previous studies (Proulx et al., , ; Flouris & Cheung, ; Lemire et al., ; Carrillo et al., , ; Flouris et al., ).…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of cold water immersion for treating exertional heat stress when immediate response is not possible

Flouris

Friesen

Carlson

et al. 2015

Scandinavian Med Sci Sports

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Immediate treatment with cold water immersion (CWI)is the gold standard for exertional heatstroke. In the field, however, treatment is often delayed due to delayed paramedic response and/or inaccurate diagnosis. We examined the effect of treatment (reduction of rectal temperature to 37.5°C) delays of 5, 20, and 40 min on core cooling rates in eight exertionally heat-stressed (40.0°C rectal temperature) individuals. We found that rectal temperature was elevated above baseline (P < 0. We conclude that the effectiveness of 2°C CWI as a treatment for exertional heat stress remains high even when applied with a delay of 40 min. Therefore, our results support that CWI is the most appropriate treatment for exertional heatstroke as it is capable of quickly reversing hyperthermia even when treatment is commenced with a significant delay.

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“…Patients are considered to have cool extremities if all examined extremities are considered cool by the examiner or if only the lower extremities are cool despite warm upper extremities in the absence of peripheral vascular occlusive disease [15]. Similarly, fingertip temperature estimations correlated well with objective assessments of fingertip blood flow [17]. Similarly, fingertip temperature estimations correlated well with objective assessments of fingertip blood flow [17].…”

Section: Skin Temperaturementioning

confidence: 95%

Monitoring peripheral perfusion in critically ill patients at the bedside

Genderen

Bommel²,

Lima³

2012

Current Opinion in Critical Care

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A Novel Model to Predict Cutaneous Finger Blood Flow via Finger and Rectal Temperatures

Abstract: We provide a model that predicts BF(f) via two practical temperature indicators that can be implemented in both clinical and field settings.

Cited by 12 publications

References 19 publications

Noninvasive assessment of muscle temperature during rest, exercise, and postexercise recovery in different environments

Noninvasive assessment of muscle temperature during rest, exercise, and postexercise recovery in different environments

Effectiveness of cold water immersion for treating exertional heat stress when immediate response is not possible

Monitoring peripheral perfusion in critically ill patients at the bedside

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