scholarly journals The Effects of Environmental Thermal Condition on Transitional Skin Temperature of Peripheral Parts of Human Hands and Feet during Exercise.

1994 ◽  
Vol 13 (6) ◽  
pp. 421-427 ◽  
Author(s):  
Miho AITA ◽  
Kunio YOSHIZUMI
Keyword(s):  
Skin Temperature ◽  
Thermal Condition ◽  
Hands And Feet ◽  
Human Hands

scholarly journals Introduction of a Portable and Non-invasive Technology for Hand and Foot Cooling: A Preclinical Feasibility Study

2021 ◽  
Author(s):  
Shirin Davarpanah Jazi ◽  
Johan Ralf ◽  
Mohammad FazelBakhsheshi
Keyword(s):  
Skin Temperature ◽  
Healthy Subjects ◽  
Cold Water ◽  
Healthy Individuals ◽  
Cooling Performance ◽  
Non Invasive ◽  
Reduced Dose ◽  
Before And After ◽  
Hands And Feet ◽  
Near Future

Abstract Purpose: Chemotherapy-induced peripheral neuropathy (CIPN) is caused by damage to neural structures in distal limbs. CIPN can lead to reduced dose or cessation of chemotherapy. Cooling the hands/feet has shown to be effective in reducing or preventing CIPN. However, when using ice bath or ice gloves/socks is no way to maintain the targeted temperature and prevent ice from melting. Also, patients have difficulty tolerating the freezing temperatures over long periods of chemotherapy. The aim of this study was to test the cooling performance of a recently developed non-invasive system that can ultimately replace current cooling methods.Methods: COOLPREVENT circulates cold water at tolerable temperatures into malleable gloves/socks. As well, COOLPREVENT does not require replacing of melted ice. We administered a cooling protocol via COOLPREVENT on three healthy subjects for 60 minutes. Immediately before and after cooling, skin temperature in the hands and feet were measured. Level of discomfort was also recorded during the cooling process.Results: Results showed that COOLPREVENT reduce skin temperature by 14.5±3.8°C and 10.7±1.7°C in the hands and feet, respectively within 60 minutes without significant discomfort.Conclusion: Although our study is limited by the small number of subjects and participation of healthy individuals, but we can conclude that COOLPREVENT can be a safe and appropriate method for hand and foot cooling. We hope that these preliminary findings can pave the way to designing clinical trials we plan to conduct in the near future.

Human hands and feet.

2013 ◽  
pp. 294-312
Author(s):  
Samuel R. Wells
Keyword(s):  
Hands And Feet ◽  
Human Hands

scholarly journals THE COEVOLUTION OF HUMAN HANDS AND FEET

Evolution ◽  
2010 ◽  
Vol 64 (6) ◽  
pp. 1558-1568 ◽  
Author(s):  
Campbell Rolian ◽  
Daniel E. Lieberman ◽  
Benedikt Hallgrímsson
Keyword(s):  
Hands And Feet ◽  
Human Hands

scholarly journals Water-induced finger wrinkles improve handling of wet objects

2013 ◽  
Vol 9 (2) ◽  
pp. 20120999 ◽  
Author(s):  
Kyriacos Kareklas ◽  
Daniel Nettle ◽  
Tom V. Smulders
Keyword(s):  
Nervous System ◽  
Autonomic Nervous System ◽  
Active Control ◽  
Glabrous Skin ◽  
Active Process ◽  
Autonomic Nervous ◽  
Submerged Objects ◽  
Hands And Feet ◽  
Human Hands

Upon continued submersion in water, the glabrous skin on human hands and feet forms wrinkles. The formation of these wrinkles is known to be an active process, controlled by the autonomic nervous system. Such an active control suggests that these wrinkles may have an important function, but this function has not been clear. In this study, we show that submerged objects are handled more quickly with wrinkled fingers than with unwrinkled fingers, whereas wrinkles make no difference to manipulating dry objects. These findings support the hypothesis that water-induced finger wrinkles improve handling submerged objects and suggest that they may be an adaptation for handling objects in wet conditions.

scholarly journals Introduction of a Portable and Non-Invasive Technology for Hand and Foot Cooling: a Preclinical Feasibility Study

2021 ◽  
Vol 6 (2) ◽  
Keyword(s):  
Skin Temperature ◽  
Cold Water ◽  
Healthy Individuals ◽  
Cooling Process ◽  
Non Invasive ◽  
Before And After ◽  
Uniform Manner ◽  
Hands And Feet ◽  
Near Future ◽  
Cooling Methods

Introduction: Chemotherapy-induced peripheral neuropathy (CIPN) is caused by damage to neural structures in distal limbs. CIPN can lead to reduced dose or cessation of chemotherapy. Cryotherapy has shown to be effective in reducing or preventing CIPN in the hands/feet. However, when using ice bath or ice gloves/socks there is no way to maintain the targeted temperature and prevent ice from melting. Also, patients have difficulty tolerating the freezing temperatures over long periods of chemotherapy. The aim of this study was to test the cooling performance of a recently developed non-invasive system that can ultimately replace current cooling methods. Materials and Methods: COOLPREVENT circulates cold water at tolerable temperatures into malleable gloves/socks that does not require replacing of melted ice. We administered a cooling protocol via COOLPREVENT on three healthy subjects for 60 minutes. Immediately before and after cooling, skin temperature in the hands and feet were measured. Level of discomfort was also recorded during the cooling process. Results: Results showed that COOLPREVENT reduces skin temperature by 14.5±3.8°C and 10.7±1.7°C in the hands and feet, respectively within 60 minutes without significant discomfort. Conclusion: Although our study is limited by the small number of subjects and participation of healthy individuals, but we can conclude that COOLPREVENT can be a safe and appropriate method for hand and foot cooling in a uniform manner. We hope that these preliminary findings can pave the way to designing clinical trials we plan to conduct in the near future.

Do chronic primary insomniacs have impaired heat loss when attempting sleep?

2006 ◽  
Vol 290 (4) ◽  
pp. R1115-R1121 ◽  
Author(s):  
Michael Gradisar ◽  
Leon Lack ◽  
Helen Wright ◽  
Jodie Harris ◽  
Amber Brooks
Keyword(s):  
Skin Temperature ◽  
Heat Loss ◽  
Core Body Temperature ◽  
Finger Skin Temperature ◽  
Finger Temperature ◽  
Temperature Changes ◽  
The Core ◽  
Hands And Feet ◽  
Core Body ◽  
Finger Skin

For good sleepers, distal skin temperatures (e.g., hands and feet) have been shown to increase when sleep is attempted. This process is said to reflect the body’s action to lose heat from the core via the periphery. However, little is known regarding whether the same process occurs for insomniacs. It would be expected that insomniacs would have restricted heat loss due to anxiety when attempting sleep. The present study compared the finger skin temperature changes when sleep was attempted for 11 chronic primary insomniacs [mean age = 40.0 years (SD 13.3)] and 8 good sleepers [mean age = 38.6 years (SD 13.2)] in a 26-h constant routine protocol with the inclusion of multiple-sleep latency tests. Contrary to predictions, insomniacs demonstrated increases in finger skin temperature when attempting sleep that were significantly greater than those in good sleepers ( P = 0.001), even though there was no significant differences in baseline finger temperature ( P = 0.25). These significant increases occurred despite insomniacs reporting significantly greater sleep anticipatory anxiety ( P < 0.0008). Interestingly, the core body temperature mesor of insomniacs (37.0 ± 0.2°C) was significantly higher than good sleepers (36.8 ± 0.2°C; P = 0.03). Whether insomniacs could have impaired heat loss that is masked by elevated heat production is discussed.

scholarly journals Skin Temperature in Relation to the Warmth of the Environment

1935 ◽  
Vol 35 (3) ◽  
pp. 307-317 ◽  
Author(s):  
T. Bedford
Keyword(s):  
Skin Temperature ◽  
Air Temperature ◽  
The Other ◽  
Cooling Power ◽  
Industrial Workers ◽  
Hands And Feet ◽  
Palm Of The Hand ◽  
Mean Square Errors ◽  
Average Skin ◽  
Skin Temperatures

The skin temperatures of industrial workers, mainly women and girls, engaged in very light occupations, have been correlated with environmental conditions. The temperatures of the forehead and of the palm of the hand were measured with a Moll radiation thermopile, and for the temperature of the foot a thermo-junction was used. Altogether 3085 sets of observations were made.Various measures of environmental warmth (dry-bulb air temperature, equivalent temperature, effective temperature, and dry kata cooling power) were correlated with skin temperature. The dry-bulb air temperature is about as good an index of skin temperature as any of the other measures used, while it appears that skin temperature may be slightly less closely associated with dry kata cooling power than with the other measures of warmth conditions.At an average air temperature of 18° C., the average skin temperatures observed were: on the forehead 34·25° C.; on the palm of the hand 29·2° C.; and on the foot 24·4° C. The average increases in skin temperature for a rise of 1° in air temperature were: on the forehead 0·139°; on the hand 0·465°; and on the foot 0·806° C.There was much variation in the skin temperatures recorded at any particular air temperature. The root-mean-square errors of estimation of skin temperature from air temperature were 0·81, 2·51, and 2·80° C., for the forehead, hands and feet respectively.Correlations between the temperatures of different areas of skin were rather lower than those between air and skin temperature.

An Active Distal Limb Warming Device for Insomnia Treatment

2017 ◽  
Author(s):  
Erik A. Zavrel ◽  
Matthew R. Ebben
Keyword(s):  
Skin Temperature ◽  
Heat Loss ◽  
Sleep Onset ◽  
Warm Water ◽  
Distal Limb ◽  
Falling Asleep ◽  
Insomnia Treatment ◽  
Hands And Feet ◽  
Body Heat ◽  
Warming Device

The defining characteristics of insomnia are widely recognized as difficulty falling asleep, difficulty staying asleep, and sleep that is non-restorative [1]. Insomnia is among the most common health complaints: about 10% of the adult population complains of a chronic insomnia problem [2]. With aging, increasingly disturbed sleep and less satisfaction with sleep quality are reported [3]. This common problem has wide ranging physiological, cognitive, and behavioral consequences including higher healthcare utilization [4–6]. Current major treatment options for insomnia (hypnotic medications and non-pharmacological behavioral interventions) suffer side effects and shortcomings. Thermoregulation plays a key role in promoting and maintaining sleep. At night, core body temperature (CBT) drops while distal skin temperature (DST) increases. It was previously believed that the nighttime drop in CBT was the most important promoter of sleep. However, recent research has shown that it is in fact the increase in DST (with net body heat loss owing to the large distal skin surface area) which is associated with an increase in sleepiness, whereas a decrease in DST (with resulting net body heat retention) is associated with a decrease in sleepiness [7]. The amount of distal vasodilation, as measured by the distal-proximal skin temperature gradient (DPG), is more predictive of sleep onset than subjective sleepiness ratings, CBT, or dim light melatonin onset. In fact, “the degree of dilation of blood vessels in the skin of the hands and feet, which increases heat loss at these extremities, is the best physiological predictor for the rapid onset of sleep” [8]. The link between distal skin warming and sleep propensity is further strengthened by the fact that warm water immersion of hands and feet has been found to decrease sleep onset latency (SOL) and pre-sleep warm baths have long been prescribed as an insomnia treatment. In a recent study, we used a multiple sleep latency test (MSLT) to perform multiple nap trials throughout the day, with the participants’ hands and feet immersed in warm water prior to each nap. We found that both mild and moderate warming of the hands and feet prior to a nap significantly reduced SOL compared to a baseline MSLT without warming [9]. We also previously conducted a trial of temperature biofeedback for insomnia treatment in which we demonstrated SOL reduction using muscle relaxation techniques to induce distal vasodilation, increase blood flow to the extremities, and modulate temperature of hands and feet [10]. Additionally, it has been shown that regardless of circadian variation throughout the day, finger temperature shows a rapid increase immediately before sleep onset [11]. Lastly, people with primary vascular dysregulation (a condition caused by abnormal vasoconstriction that results in cold hands and feet) exhibit significantly increased SOL and greater difficulty falling asleep following nocturnal arousal [12]. Thus, some presentations of insomnia may be secondary to distal vasodilation failure. The motivation for an active distal limb warming device as a treatment for insomnia is based on the established functional link between distal vasodilation and sleep induction [13]. Somewhat counterintuitively then, heating of hands and feet can induce distal vasodilation, promote net body heat loss, and facilitate sleep onset [14, 15].

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