Evaluation of Various Cooling Systems After Exercise-Induced Hyperthermia

Tan, Pearl Min Sze; Teo, Eunice Y. N.; Ali, Noreffendy Bin; Ang, Bryan Chin Hou; Iskandar, Iswady; Law, Lydia Yu Li; Lee, Jason

doi:10.4085/1062-6050-52.1.11

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…The cooling device is layered with a skin-friendly and dermatologically tested medical adhesive film and sticks onto the participant’s skin until removed. Before use, the cooling device was kept at 4 °C [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

Neck cooling induces blood pressure increase and peripheral vasoconstriction in healthy persons

et al. 2020

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Introduction Noninvasive temperature modulation by localized neck cooling might be desirable in the prehospital phase of acute hypoxic brain injuries. While combined head and neck cooling induces significant discomfort, peripheral vasoconstriction, and blood pressure increase, localized neck cooling more selectively targets blood vessels that supply the brain, spares thermal receptors of the face and skull, and might therefore cause less discomfort cardiovascular side effects compared to head- and neck cooling. The purpose of this study is to assess the effects of noninvasive selective neck cooling on cardiovascular parameters and cerebral blood flow velocity (CBFV). Methods Eleven healthy persons (6 women, mean age 42 ± 11 years) underwent 90 min of localized dorsal and frontal neck cooling (EMCOOLS Brain.Pad™) without sedation. Before and after cooling onset, and after every 10 min of cooling, we determined rectal, tympanic, and neck skin temperatures. Before and after cooling onset, after 60- and 90-min cooling, we monitored RR intervals (RRI), systolic, diastolic blood pressures (BPsys, BPdia), laser Doppler skin blood flow (SBF) at the index finger pulp, and CBFV at the proximal middle cerebral artery (MCA). We compared values before and during cooling by analysis of variance for repeated measurements with post hoc analysis (significance: p < 0.05). Results Neck skin temperature dropped significantly by 9.2 ± 4.5 °C (minimum after 40 min), while tympanic temperature decreased by only 0.8 ± 0.4 °C (minimum after 50 min), and rectal temperature by only 0.2 ± 0.3 °C (minimum after 60 min of cooling). Index finger SBF decreased (by 83.4 ± 126.0 PU), BPsys and BPdia increased (by 11.2 ± 13.1 mmHg and 8.0 ± 10.1 mmHg), and heart rate slowed significantly while MCA-CBFV remained unchanged during cooling. Conclusions While localized neck cooling prominently lowered neck skin temperature, it had little effect on tympanic temperature but significantly increased BP which may have detrimental effects in patients with acute brain injuries.

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Section: Methodsmentioning

confidence: 99%

Neck cooling induces blood pressure increase and peripheral vasoconstriction in healthy persons

et al. 2020

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“…There is a need to transform the paradigm of AC and the future solution is likely to shift towards targeted body surface cooling, as opposed to cooling the space in the room [96,262,263]. If successful, targeted body surface cooling can maintain thermal comfort and Tb, with significantly less energy required and possibly, with no carbon emission.…”

Section: Air and Body Coolingmentioning

confidence: 99%

“…Using the body cooling device extended work tolerance by 1.2-fold to 2-fold and maintained peak Tc at <39.5 • C during the three work cycles [103]. The need for PCD is even greater with the threats posed by global warming and there are ongoing efforts to advance PCD technologies to meet current and future needs [210,257,263,264,[266][267][268][269][270]. With technological advancements and the need to reduce carbon emission, it is conceivable that the concept of AC would shift from cooling the environment to cooling the body.…”

Section: Air and Body Coolingmentioning

confidence: 99%

Fundamental Concepts of Human Thermoregulation and Adaptation to Heat: A Review in the Context of Global Warming

Lim

2020

IJERPH

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The international community has recognized global warming as an impending catastrophe that poses significant threat to life on earth. In response, the signatories of the Paris Agreement (2015) have committed to limit the increase in global mean temperature to < 1.5 °C from pre-industry period, which is defined as 1950–1890. Considering that the protection of human life is a central focus in the Paris Agreement, the naturally endowed properties of the human body to protect itself from environmental extremes should form the core of an integrated and multifaceted solution against global warming. Scholars believe that heat and thermoregulation played important roles in the evolution of life and continue to be a central mechanism that allows humans to explore, labor and live in extreme conditions. However, the international effort against global warming has focused primarily on protecting the environment and on the reduction of greenhouse gases by changing human behavior, industrial practices and government policies, with limited consideration given to the nature and design of the human thermoregulatory system. Global warming is projected to challenge the limits of human thermoregulation, which can be enhanced by complementing innate human thermo-plasticity with the appropriate behavioral changes and technological innovations. Therefore, the primary aim of this review is to discuss the fundamental concepts and physiology of human thermoregulation as the underlying bases for human adaptation to global warming. Potential strategies to extend human tolerance against environmental heat through behavioral adaptations and technological innovations will also be discussed. An important behavioral adaptation postulated by this review is that sleep/wake cycles would gravitate towards a sub-nocturnal pattern, especially for outdoor activities, to avoid the heat in the day. Technologically, the current concept of air conditioning the space in the room would likely steer towards the concept of targeted body surface cooling. The current review was conducted using materials that were derived from PubMed search engine and the personal library of the author. The PubMed search was conducted using combinations of keywords that are related to the theme and topics in the respective sections of the review. The final set of articles selected were considered “state of the art,” based on their contributions to the strength of scientific evidence and novelty in the domain knowledge on human thermoregulation and global warming.

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Pilot Study—Portable Evaporative Cooling System for Exercise-Induced Hyperthermia

Tan

Lim²,

2021

17th International Conference on Biomedical Engineering

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Evaluation of Various Cooling Systems After Exercise-Induced Hyperthermia

Abstract: These findings provide objective evidence for selecting the most effective cooling system of those we evaluated for cooling individuals with exercise-induced hyperthermia. Nevertheless, factors other than cooling efficacy need to be considered when selecting an appropriate cooling system.

Cited by 11 publications

References 36 publications

Neck cooling induces blood pressure increase and peripheral vasoconstriction in healthy persons

Neck cooling induces blood pressure increase and peripheral vasoconstriction in healthy persons

Fundamental Concepts of Human Thermoregulation and Adaptation to Heat: A Review in the Context of Global Warming

Pilot Study—Portable Evaporative Cooling System for Exercise-Induced Hyperthermia

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