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The multifaceted benefits of passive heat therapies for extending the healthspan: A comprehensive review with a focus on Finnish sauna 被动热疗对延长健康寿命的多方面益处:以芬兰桑拿为重点的全面回顾
Pub Date : 2024-02-25 DOI: 10.1080/23328940.2023.2300623
J. Laukkanen, S. Kunutsor
ABSTRACT Passive heat therapy is characterized by exposure to a high environmental temperature for a brief period. There are several types of passive heat therapy which include hot tubs, Waon therapy, hydrotherapy, sanarium, steam baths, infrared saunas and Finnish saunas. The most commonly used and widely studied till date are the Finnish saunas, which are characterized by high temperatures (ranging from 80–100°C) and dry air with relative humidity varying from 10–20%. The goal of this review is to provide a summary of the current evidence on the impact of passive heat therapies particularly Finnish saunas on various health outcomes, while acknowledging the potential of these therapies to contribute to the extension of healthspan, based on their demonstrated health benefits and disease prevention capabilities. The Finnish saunas have the most consistent and robust evidence regarding health benefits and they have been shown to decrease the risk of health outcomes such as hypertension, cardiovascular disease, thromboembolism, dementia, and respiratory conditions; may improve the severity of musculoskeletal disorders, COVID-19, headache and flu, while also improving mental well-being, sleep, and longevity. Finnish saunas may also augment the beneficial effects of other protective lifestyle factors such as physical activity. The beneficial effects of passive heat therapies may be linked to their anti-inflammatory, cytoprotective and anti-oxidant properties and synergistic effects on neuroendocrine, circulatory, cardiovascular and immune function. Passive heat therapies, notably Finnish saunas, are emerging as potentially powerful and holistic strategies to promoting health and extending the healthspan in all populations.
摘要 被动热疗的特点是短时间暴露在高温环境中。被动热疗有多种类型,包括热水浴、Waon疗法、水疗、Sanarium、蒸汽浴、红外线桑拿和芬兰桑拿。迄今为止,最常用和研究最广泛的是芬兰桑拿,其特点是温度高(80-100°C 不等),空气干燥,相对湿度在 10-20% 之间。这篇综述的目的是总结被动式热疗法,特别是芬兰桑拿对各种健康结果的影响的现有证据,同时承认这些疗法在促进健康和预防疾病方面的潜力。芬兰桑拿在健康益处方面拥有最一致、最有力的证据,它们已被证明可以降低高血压、心血管疾病、血栓栓塞症、痴呆症和呼吸系统疾病等健康风险;可以改善肌肉骨骼疾病、COVID-19、头痛和流感的严重程度,同时还能改善精神状态、睡眠和长寿。芬兰桑拿还可以增强体育锻炼等其他保护性生活方式的有益效果。被动热疗的有益效果可能与其抗炎、细胞保护和抗氧化特性以及对神经内分泌、循环系统、心血管和免疫功能的协同作用有关。被动热疗法,尤其是芬兰桑拿,正在成为促进所有人群健康和延长健康寿命的潜在强大综合策略。
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引用次数: 0
Thermoregulation in mice: The road to understanding torpor hypothermia and the shortcomings of a circuit for generating fever 小鼠的体温调节:了解麻木性体温过低和发热电路的缺点
Pub Date : 2022-01-02 DOI: 10.1080/23328940.2021.2021059
S. Morrison, Kazuhiro Nakamura, D. Tupone
In their review, “Genetic identification of preoptic neurons that regulate body in mice”, Machado and Saper [1] summarize and interpret the results of several recent studies in which the latest genetic and molecular approaches were employed to genetically specify populations of thermally responsive neurons in the preoptic area (POA) of mice and to observe the changes on core body temperature (Tc) evoked by stimulating or inhibiting their cell bodies or axon terminals. This review is a useful summary of many of the key findings related to POA thermoregulatory neurons that would need to be incorporated in functional models of the neural circuitry mediating mouse thermoregulatory responses, including not only cold- and warm-defense, but also fever and the hypothermia of cold-evoked torpor. In stark contrast to rats and humans, mice depend heavily on the cold-defense mechanisms of somatic activity thermogenesis and torpor, suggesting that there must be several aspects of the functional organiza-tion of their thermoregulatory circuitry, including that in the POA, that are unique to mice. Thus, it will be of particular interest to determine the wider applicability to other mammalian species of the new discoveries regarding central thermoregulatory circuits being made through genetic manipulation approaches in mice. However, despite several detailed studies on thermoregulatory neurons in mice, including those described in this review, many of the fundamental aspects of the neural circuits that function to explain even the most basic aspects of mouse thermoregulation, such as cold- or warm-defense, energy-conserving torpor hypothermia, and pathogen-combating fever, remain to be elucidated. The authors describe some of what is known of the considerable heterogeneity with regard to genetics, projection patterns, and receptor and neurotransmitter
Machado和Saper[1]在他们的综述“Genetic identification of preoptic neurons that regulatory body In mice”中,总结并解释了最近几项研究的结果,这些研究采用最新的遗传和分子方法,对小鼠的preoptic area (POA)的热反应神经元群体进行了遗传指定,并观察了刺激或抑制其细胞体或轴突末端所引起的核心体温(Tc)的变化。这篇综述对许多与POA热调节神经元相关的关键发现进行了有益的总结,这些发现需要纳入介导小鼠热调节反应的神经回路功能模型,不仅包括冷防御和热防御,还包括发烧和冷诱发的低体温。与大鼠和人类形成鲜明对比的是,小鼠在很大程度上依赖于躯体活动产热和麻木的冷防御机制,这表明它们的体温调节回路的功能组织中一定有几个方面是小鼠独有的,包括POA中的功能组织。因此,确定通过基因操作方法在小鼠身上获得的关于中枢体温调节回路的新发现对其他哺乳动物物种的更广泛适用性将是特别有趣的。然而,尽管对小鼠体温调节神经元进行了一些详细的研究,包括本综述中所述的研究,但神经回路的许多基本方面仍有待阐明,这些基本方面甚至可以解释小鼠体温调节的最基本方面,如冷防御或热防御、节能性冬眠低体温和对抗病原体的发热。作者描述了一些已知的遗传、投射模式、受体和神经递质方面的相当大的异质性
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引用次数: 1
Cooling vests alleviate perceptual heat strain perceived by COVID-19 nurses 降温背心可缓解COVID-19护士感知的感性热应激
Pub Date : 2021-01-20 DOI: 10.1080/23328940.2020.1868386
Johannus Q. de Korte, C. Bongers, M. Catoire, B. Kingma, T. Eijsvogels
ABSTRACT Cooling vests alleviate heat strain. We quantified the perceptual and physiological heat strain and assessed the effects of wearing a 21°C phase change material cooling vest on these measures during work shifts of COVID-19 nurses wearing personal protective equipment (PPE). Seventeen nurses were monitored on two working days, consisting of a control (PPE only) and a cooling vest day (PPE + cooling vest). Sub-PPE air temperature, gastrointestinal temperature (Tgi), and heart rate (HR) were measured continuously. Thermal comfort (2 [1–4] versus 1 [1–2], pcondtition < 0.001) and thermal sensation (5 [4–7] versus 4 [2–7], pcondition < 0.001) improved in the cooling vest versus control condition. Only 18% of nurses reported thermal discomfort and 36% a (slightly) warm thermal sensation in the cooling vest condition versus 81% and 94% in the control condition (OR (95%CI) 0.05 (0.01–0.29) and 0.04 (<0.01–0.35), respectively). Accordingly, perceptual strain index was lower in the cooling vest versus control condition (5.7 ± 1.5 versus 4.3 ± 1.7, pcondition < 0.001, respectively). No differences were observed for the physiological heat strain index Tgi and rating of perceived exertion across conditions. Average HR was slightly lower in the cooling vest versus the control condition (85 ± 12 versus 87 ± 11, pcondition = 0.025). Although the physiological heat strain among nurses using PPE was limited, substantial perceptual heat strain was experienced. A 21°C phase change material cooling vest can successfully alleviate the perceptual heat strain encountered by nurses wearing PPE.
冷却背心减轻热负荷。我们量化了穿着个人防护装备(PPE)的COVID-19护士在轮班期间的感知和生理热应变,并评估了穿着21°C相变材料冷却背心对这些措施的影响。对17名护士进行2个工作日的监测,包括对照组(仅PPE)和降温背心日(PPE +降温背心)。连续测量亚ppe温度、胃肠温度(Tgi)和心率(HR)。热舒适(2[1 - 4]对1[1 - 2],条件< 0.001)和热感觉(5[4 - 7]对4[2 - 7],条件< 0.001)在冷却背心与对照组相比有所改善。在降温背心条件下,只有18%的护士报告了热不适,36%的护士报告了(轻微)温暖的热感觉,而在对照组条件下,分别有81%和94% (OR (95%CI) 0.05(0.01-0.29)和0.04(< 0.01-0.35))。因此,与对照组相比,冷却背心组的感知应变指数更低(5.7±1.5比4.3±1.7,p条件< 0.001)。在不同条件下,生理热应变指数Tgi和感知劳累等级无差异。冷却背心组的平均心率略低于对照组(85±12比87±11,p条件= 0.025)。虽然使用防护用品的护士的生理性热应变有限,但存在大量的感性热应变。21°C相变材料冷却背心可以成功缓解护士佩戴PPE时遇到的感知热应变。
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引用次数: 13
Divers risk accelerated fatigue and core temperature rise during fully-immersed exercise in warmer water temperature extremes 在极端温暖的水温下,潜水员在完全浸入式的运动中有加速疲劳和核心温度上升的风险
Pub Date : 2019-04-03 DOI: 10.1080/23328940.2019.1599182
David P. Looney, E. T. Long, Adam W. Potter, Xiaojiang Xu, K. Friedl, R. Hoyt, Christopher R. Chalmers, M. Buller, J. Florian
ABSTRACT Physiological responses to work in cold water have been well studied but little is known about the effects of exercise in warm water; an overlooked but critical issue for certain military, scientific, recreational, and professional diving operations. This investigation examined core temperature responses to fatiguing, fully-immersed exercise in extremely warm waters. Twenty-one male U.S. Navy divers (body mass, 87.3 ± 12.3 kg) were monitored during rest and fatiguing exercise while fully-immersed in four different water temperatures (Tw): 34.4, 35.8, 37.2, and 38.6°C (Tw34.4, Tw35.8, Tw37.2, and Tw38.6 respectively). Participants exercised on an underwater cycle ergometer until volitional fatigue or core temperature limits were reached. Core body temperature and heart rate were monitored continuously. Trial performance time decreased significantly as water temperature increased (Tw34.4, 174 ± 12 min; Tw35.8, 115 ± 13 min; Tw37.2, 50 ± 13 min; Tw38.6, 34 ± 14 min). Peak core body temperature during work was significantly lower in Tw34.4 water (38.31 ± 0.49°C) than in warmer temperatures (Tw35.8, 38.60 ± 0.55°C; Tw37.2, 38.82 ± 0.76°C; Tw38.6, 38.97 ± 0.65°C). Core body temperature rate of change increased significantly with warmer water temperature (Tw34.4, 0.39 ± 0.28°C·h−1; Tw35.8, 0.80 ± 0.19°C·h−1; Tw37.2, 2.02 ± 0.31°C·h−1; Tw38.6, 3.54 ± 0.41°C·h−1). Physically active divers risk severe hyperthermia in warmer waters. Increases in water temperature drastically increase the rate of core body temperature rise during work in warm water. New predictive models for core temperature based on workload and duration of warm water exposure are needed to ensure warm water diving safety.
在冷水中工作的生理反应已经得到了很好的研究,但对在温水中运动的影响知之甚少;对于某些军事、科学、娱乐和专业潜水行动来说,这是一个被忽视但至关重要的问题。这项研究考察了在极度温暖的海水中进行疲劳、完全浸入式运动时的核心温度反应。21名美国海军男性潜水员(体重为87.3±12.3 kg)在休息和疲劳运动期间进行监测,同时完全浸入四种不同的水温(Tw): 34.4, 35.8, 37.2和38.6°C (Tw34.4, Tw35.8, Tw37.2和Tw38.6)。参与者在水下循环测力仪上进行锻炼,直到达到意志疲劳或核心温度极限。连续监测核心体温和心率。试验时间随水温升高而显著缩短(Tw34.4, 174±12 min;Tw35.8, 115±13 min;Tw37.2, 50±13 min;Tw38.6, 34±14 min)。工作时的峰值核心体温在Tw34.4水(38.31±0.49°C)显著低于较温暖温度(Tw35.8, 38.60±0.55°C;Tw37.2, 38.82±0.76℃;Tw38.6, 38.97±0.65°C)。随着水温升高,核心体温变化率显著增加(Tw34.4, 0.39±0.28°C·h−1;Tw35.8, 0.80±0.19°C·h−1;Tw37.2, 2.02±0.31°C·h−1;Tw38.6, 3.54±0.41°C·h−1)。身体活跃的潜水员在温暖的海水中有严重的体温过高的危险。在温水中工作时,水温的升高会大大增加核心体温的上升速度。为了保证温水潜水的安全,需要新的基于工作量和温水暴露时间的堆芯温度预测模型。
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引用次数: 9
Prolonged self-paced exercise in the heat – environmental factors affecting performance 长时间自定节奏的高温运动——影响运动表现的环境因素
Pub Date : 2016-08-15 DOI: 10.1080/23328940.2016.1216257
Nicklas Junge, Rasmus Jørgensen, A. Flouris, L. Nybo
ABSTRACT In this review we examine how self-paced performance is affected by environmental heat stress factors during cycling time trial performance as well as considering the effects of exercise mode and heat acclimatization. Mean power output during prolonged cycling time trials in the heat (≥30°C) was on average reduced by 15% in the 14 studies that fulfilled the inclusion criteria. Ambient temperature per se was a poor predictor of the integrated environmental heat stress and 2 of the prevailing heat stress indices (WBGT and UTCI) failed to predict the environmental influence on performance. The weighing of wind speed appears to be too low for predicting the effect for cycling in trained acclimatized subjects, where performance may be maintained in outdoor time trials at ambient temperatures as high as 36°C (36°C UTCI; 28°C WBGT). Power output during indoor trials may also be maintained with temperatures up to at least 27°C when humidity is modest and wind speed matches the movement speed generated during outdoor cycling, whereas marked reductions are observed when air movement is minimal. For running, representing an exercise mode with lower movement speed and higher heat production for a given metabolic rate, it appears that endurance is affected even at much lower ambient temperatures. On this basis we conclude that environmental heat stress impacts self-paced endurance performance. However, the effect is markedly modified by acclimatization status and exercise mode, as the wind generated by the exercise (movement speed) or the environment (natural or fan air movement) exerts a strong influence.
在这篇综述中,我们研究了在自行车计时赛中,环境热应激因素如何影响自定节奏的表现,并考虑了运动方式和热适应的影响。在符合纳入标准的14项研究中,在高温(≥30°C)长时间循环试验期间的平均功率输出平均降低了15%。环境温度本身不能很好地预测综合环境热应力,2个流行的热应力指数(WBGT和UTCI)不能预测环境对性能的影响。风速的权重似乎太低,无法预测训练有素的适应环境的受试者骑自行车的影响,在室外计时赛中,环境温度高达36°C(36°C UTCI;28°C WBGT)。当湿度适中且风速与室外循环时产生的运动速度相匹配时,室内试验期间的功率输出也可以保持在至少27°C的温度下,而当空气运动最小时,则观察到明显的减少。对于跑步来说,它代表了一种运动模式,在给定的代谢率下,运动速度较低,热量产生较高,即使在较低的环境温度下,耐力也会受到影响。在此基础上,我们得出了环境热应激对自定节奏耐力性能的影响。但由于运动产生的风(运动速度)或环境(自然或风扇气流)的影响较大,因此驯化状态和运动方式会明显改变这种效果。
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引用次数: 51
Hyperthermia during exercise – a double-edged sword 运动时的热疗是一把双刃剑
Pub Date : 2016-07-06 DOI: 10.1080/23328940.2016.1194954
M. Buono, P. Cabrales
AbstractPrevious studies have reported that various types of exercise cause a significant increase in blood viscosity. However, they did not account for the potential effect that exercise-induced hyperthermia might have on mitigating the change in blood viscosity. Our results suggest that hemoconcentration and hyperthermia counterbalance each other so there is no overall change in blood viscosity during prolonged exercise in the heat.
摘要以往的研究报道,各种类型的运动导致血液粘度显著增加。然而,他们没有考虑到运动引起的热疗可能对减轻血液粘度变化的潜在影响。我们的研究结果表明,血液浓缩和热疗相互抵消,因此在高温下长时间运动时,血液粘度没有总体变化。
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引用次数: 4
Why is it easier to run in the cold? 为什么在寒冷中跑步更容易?
Pub Date : 2016-06-17 DOI: 10.1080/23328940.2016.1201182
Y. Molkov, D. Zaretsky
Overheating is one of the main factors limiting physical activity. During running, thermoregulatory metabolism, which keeps core temperature steady at rest, is adjusted through a body temperature independent mechanism to compensate for the exertional heat generation. The colder the environment, the higher the metabolism at rest, and the more complete the compensation is. As a marathoner, one of us logged many miles of training which serve as an interesting dataset spanning several summer and winter seasons. Strikingly, the average pace during the winter months appears to be about 1 minute per mile faster than during the summer months, displaying a huge difference in performance. Besides, every long distance runner knows that it may take a noticeably longer time to start sweating when it is cold outside in spite of an often faster pace and warmer clothing. This raises the question why colder environment possibly leads to a slower temperature growth and to a potentially better performance. High body temperature is a major regulatory signal to limit the physical effort and, thus, to prevent the temperature from growing further. So, for the effort to remain at high level, the temperature should stay away from this threshold for as long as possible. The rate of temperature change is defined by a balance between 2 processes: heat produced vs. heat dissipated per unit of time. Importantly, both heat production and skin thermal conductance have lower limits: a certain level of metabolism is required to maintain basic functions, and the skin even with fully constricted vessels does not completely insulate the body. To maintain constant temperature, the production of heat must exactly compensate for the dissipation of heat. When possible, mammals keep their heat dissipation at minimum not to spend energy for regulatory thermogenesis. Physical activity is actuated by muscle contractions, which are not extremely efficient processes. In fact, more than 80% of the energy generated in the muscles is wasted in the form of additional heat. This heat depends on the exercise intensity only. It may look like the best way to limit the temperature growth is to increase heat dissipation, which in both humans and rodents occurs in major part through an increase in blood flow in the skin. However, greater cutaneous blood flow competes with blood supply to other organs including muscles. That may be a reason why during exercise cutaneous vasodilation does not kick in until the temperature reaches really high levels close to the fatigue threshold. Heat dissipation can be represented as the product of the difference of temperatures inside and outside of the body and the thermal conductance of skin. In this context, one may think that at colder ambient conditions heat dissipation naturally increases due to a greater difference between the body temperature and the temperature of the environment. However, this higher dissipation occurs before the exercise even starts and, henc
过热是限制身体活动的主要因素之一。在跑步过程中,体温调节代谢通过一种与体温无关的机制进行调节,以补偿运动产生的热量,从而保持静止时核心温度的稳定。环境越冷,静止时代谢越高,代偿越完全。作为一名马拉松运动员,我们中的一个人记录了许多英里的训练,这是一个有趣的数据集,跨越了几个夏天和冬天。引人注目的是,冬季的平均配速似乎比夏季的每英里快1分钟,表现出巨大的差异。此外,每一个长跑运动员都知道,尽管跑得更快,穿得更暖和,但当外面很冷的时候,他们开始出汗的时间可能会明显更长。这就提出了一个问题,为什么较冷的环境可能导致较慢的温度增长和潜在的更好的性能。高体温是限制体力活动的主要调节信号,从而防止体温进一步升高。因此,为了保持高水平,温度应该尽可能长时间地远离这个阈值。温度变化率由两个过程之间的平衡来定义:单位时间内产生的热量与散发的热量。重要的是,产热和皮肤导热都有下限:维持基本功能需要一定水平的新陈代谢,即使血管完全收缩,皮肤也不能完全隔绝身体。为了保持温度恒定,热量的产生必须精确地补偿热量的散失。在可能的情况下,哺乳动物会尽量减少散热,而不是将能量用于调节产热。身体活动是由肌肉收缩驱动的,这不是一个非常有效的过程。事实上,肌肉中产生的80%以上的能量都以额外热量的形式浪费掉了。这种热量只取决于运动强度。看起来限制温度升高的最好方法是增加散热,这在人类和啮齿动物中主要是通过增加皮肤中的血液流动来实现的。然而,更大的皮肤血流量与包括肌肉在内的其他器官的血液供应竞争。这可能就是为什么在运动过程中,皮肤血管扩张直到温度达到非常高的水平,接近疲劳阈值时才会开始。散热可以表示为人体内外温差与皮肤导热系数的乘积。在这种情况下,人们可能会认为,在较冷的环境条件下,由于体温和环境温度之间的较大差异,散热自然会增加。然而,这种更高的耗散发生在运动开始之前,因此,由热调节代谢产热来补偿。综上所述,除非与运动无关的代谢减少,否则寒冷环境不能通过降低核心体温来提供供氧优势。体温调节系统可能会关闭或
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引用次数: 3
Adaptive processes explain variations in human thermal sensation 适应性过程解释了人类热感觉的变化
Pub Date : 2016-06-17 DOI: 10.1080/23328940.2016.1200204
M. Schweiker
Models for human perception of thermal environments included in so-called thermal comfort standards are either based on principles of thermal heat balance, or on large empirical datasets that include human adaptations to different thermal environments (i.e. so-called adaptive approach). The framework for an adaptive thermal heat balance model (ATHB) combines these 2 approaches, improves the predictive performance and offers further potentials to explain variations in human thermal sensation as discussed below. At first, due to different foundations of both models it may seem illogical to combine the heat balance approach with the adaptive approach. One is based on a steady-state heat balance of the human body taking into account the indoor environmental parameters air temperature, mean radiant temperature, air velocity, and air humidity as well as the clothing level and metabolic rate of a person. The other established a theoretical framework including behavioral, physiological, and psychological adaptive processes and considers averaged floating outdoor conditions. The combination of the 2 approaches as described by the ATHB is realized by setting up simple exemplary equations for each of the 3 adaptive processes individually. These equations adapt the values for the clothing level and the metabolic rate used as input for the heat balance model equations. The equation related to behavioral adaptation is a linear function with the running mean outdoor temperature as independent and the clothing level as dependent variable. With increasing outdoor temperatures, people are wearing lighter clothing ensembles. Maximum and minimum clothing insulation values are specified. Related to physiological adaptation, a linear equation modifies the metabolic rate based on the running mean outdoor temperature. With increasing outdoor temperatures, metabolic rate decreases as we assumed that people’s thermo-regulative system adapts to warm conditions and gets more efficient. Psychological adaptive processes were assumed to alter metabolic rate, too. This can happen on the one hand in a variable form depending on an environmental stimulus, e.g. with higher indoor temperatures, perceived control was found to decrease, which let the metabolic rate increase. On the other hand, this can be a fixed offset in metabolic rate depending on the type of environment, e.g., a higher number of people in the same room increased metabolic rate due to psychological stress while a higher number of control opportunities decreased metabolic rate. Using data from experimental studies in our LOBSTER facility, a realistic office environment with a controllable thermal indoor environment and possibilities for subjects to interact with the outdoor environment through operable windows (Fig. 1A), we derived the corresponding coefficients for these equations through mixed effect regression analyses. Thereby, the magnitude of increase and decrease of the metabolic rate was inferred from measu
所谓的热舒适标准中包含的人类对热环境感知的模型要么基于热平衡原理,要么基于包括人类对不同热环境适应的大型经验数据集(即所谓的适应性方法)。自适应热平衡模型(ATHB)的框架结合了这两种方法,提高了预测性能,并提供了进一步解释人体热感觉变化的潜力,如下所述。首先,由于两种模型的基础不同,将热平衡方法与自适应方法结合起来似乎是不合逻辑的。一种是基于人体的稳态热平衡,考虑到室内环境参数——空气温度、平均辐射温度、空气速度和空气湿度,以及人的衣服水平和代谢率。另一个建立了一个理论框架,包括行为、生理和心理适应过程,并考虑了平均漂浮的室外条件。ATHB所描述的两种方法的结合是通过分别为3种自适应过程中的每一种建立简单的示例方程来实现的。这些方程适应了作为热平衡模型方程输入的服装水平和代谢率的值。行为适应方程是一个以室外平均温度为自变量,服装水平为因变量的线性函数。随着室外温度的升高,人们开始穿轻便的服装。规定了最大和最小服装绝缘值。与生理适应相关,一个基于室外平均温度的线性方程修正了代谢率。随着室外温度的升高,代谢率降低,因为我们假设人体的热调节系统适应了温暖的环境并变得更有效率。心理适应过程也被认为会改变代谢率。一方面,这可能以一种取决于环境刺激的可变形式发生,例如,在较高的室内温度下,感知控制被发现减少,这使得代谢率增加。另一方面,根据环境类型,这可能是代谢率的固定偏移,例如,由于心理压力,同一房间中人数较多会增加代谢率,而控制机会较多则会降低代谢率。利用我们在LOBSTER设施中进行的实验研究数据,我们通过混合效应回归分析得出了这些方程的相应系数,该设施是一个真实的办公环境,具有可控的室内热环境,并且受试者可以通过可操作的窗户与室外环境进行互动(图1A)。因此,代谢率的增加和减少的幅度是从心率的测量和相应的回归分析中推断出来的。迄今为止,个体或群体之间代谢率或适应程度的差异一直被忽视。但是,这种分析的结果可以纳入下文讨论的方法的未来进展。通过将该框架应用于Fanger的pmv模型,可以绘制出被视为中性的操作温度与运行平均室外温度之间的关系。包括所有三个自适应
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引用次数: 1
A cellular pathway controlling functional plasma membrane incorporation of the cold sensor TRPM8 控制冷传感器TRPM8功能质膜结合的细胞途径
Pub Date : 2016-06-17 DOI: 10.1080/23328940.2016.1200205
J. Vriens, T. Voets
The transient receptor potential melastatin 8 (TRPM8) plays a crucial part in cold detection by the somatosensory system. In heterologous expression systems, TRPM8 activity steeply increases upon cooling and in the presence of substances that are known to produce a cooling sensation, including menthol, and the ‘super-cooling agent’ icilin. TRPM8-deficient mice exhibited a striking deficit in avoiding cool temperatures (18–30 C). Moreover, whereas mild cooling can evoke analgesia in wild-type mice, cooling-induced analgesia was absent in TRPM8-deficient mice. Importantly, increased functional expression of TRPM8 contributes to pathological cold hypersensitivity and cold allodynia in various animal models of neuropathic and inflammatory pain. In recent years, important advances have been made in our knowledge about the biophysical properties of TRPM8. However, the knowledge about the trafficking mechanism that determine the abundance of TRPM8 at the plasma membrane is very sparse. Nevertheless, modulation of the number of active cold sensitive TRPM8 channels at the plasma membrane represents an important regulatory mechanism under normal and pathophysiological conditions. In this article we discuss our recent findings published in the article ’VAMP7 regulates constitutive membrane incorporation of the cold-activated channel’ in which we have uncovered a cellular pathway that controls functional plasma membrane incorporation of TRPM8, and thus regulates thermo-sensitivity in vivo. By the use of Total internal reflection fluorescence (TIRF) microscopy, in which only a thin layer of illumination above the interface is created and only fluorophores within this thin layer (»100–300 nm) in the sample are excited, we revealed that fluorescently tagged TRPM8 channels are located in a population of highly dynamic vesicular and tubular structures. By treatment of TRPM8-mCherry expressing cells with microtubuleor actindepolymerizing agents and additional TIRF Recovery after Photobleaching (TIRF-FRAP) experiments, we were able to show that TRPM8-positive structures use microtubules as principal track for rapid near-membrane intracellular movement. Further characterization of the mobile TRPM8-positive structures was done by co-expression of TRPM8-mCherry along with known markers of various cellular compartments tagged with GFP, and quantified by dual-color TIRFM to simultaneously monitor the movement of TRPM8-mCherry along with GFP-tagged marker proteins. These results showed strong dynamic co-localization of TRPM8 and the Lysosomal associated membrane protein 1 (LAMP1), which was also observed in neurites of TGN co-expressing TRPM8-mCherry and LAMP1-GFP (Fig. 1A). Although LAMP1 is typically associated with endo-lysosomal structures, additional TIR-FRAP experiments indicated that TRPM8and LAMP1-positive mobile vesicles transport TRPM8 from the cell center toward the plasma membrane via microtubules. The pool of mobile TRPM8-positive vesicles is a stable compar
瞬时受体电位褪黑抑素8 (TRPM8)在体感觉系统的冷检测中起着至关重要的作用。在异源表达系统中,TRPM8活性在冷却和已知产生冷却感觉的物质(包括薄荷醇和“过冷剂”icilin)存在时急剧增加。trpm8缺陷小鼠在避免低温(18-30℃)方面表现出明显的缺陷。此外,温和的冷却可以在野生型小鼠中引起镇痛,而在trpm8缺陷小鼠中没有冷却诱导的镇痛。重要的是,在各种神经性和炎症性疼痛的动物模型中,TRPM8功能表达的增加有助于病理性冷超敏反应和冷异常性痛。近年来,我们对TRPM8生物物理性质的认识取得了重要进展。然而,关于确定质膜上TRPM8丰度的转运机制的知识非常少。然而,在正常和病理生理条件下,质膜上活性冷敏感TRPM8通道数量的调节是一种重要的调节机制。在这篇文章中,我们讨论了我们最近发表在文章“VAMP7调节冷激活通道的组成膜结合”中的发现,我们发现了一种控制TRPM8功能性质膜结合的细胞途径,从而调节体内的热敏性。通过使用全内反射荧光(TIRF)显微镜,其中仅在界面上方创建一薄层照明,并且仅在样品中该薄层(»100-300 nm)内的荧光团被激发,我们发现荧光标记的TRPM8通道位于高度动态的泡状和管状结构中。通过微管或actindeo聚合剂处理TRPM8-mCherry表达细胞和额外的光漂白后TIRF恢复(TIRF- frap)实验,我们能够证明trpm8阳性结构使用微管作为快速近膜胞内运动的主要途径。通过将TRPM8-mCherry与GFP标记的各种细胞区室的已知标记共表达,进一步表征trpm8阳性结构,并通过双色TIRFM定量,同时监测TRPM8-mCherry与GFP标记的标记蛋白的运动。这些结果显示了TRPM8和溶酶体相关膜蛋白1 (LAMP1)的强烈动态共定位,这也在共表达TRPM8- mcherry和LAMP1- gfp的TGN的神经突中观察到(图1A)。虽然LAMP1通常与内溶酶体结构相关,但额外的TIR-FRAP实验表明,TRPM8和LAMP1阳性的移动囊泡通过微管将TRPM8从细胞中心运送到质膜。可移动的trpm8阳性囊泡池是一个稳定的隔室,而不是针对降解的溶酶体结构。在近膜区观察到的绝大多数TRPM8 -或lamp1阳性结构没有被溶酶体红或pHrodo红葡聚糖染色,这表明这些结构的腔内pH高于经典溶酶体(pH < 6)。进一步的共定位研究表明TRPM8与水泡SNARE蛋白VAMP7之间存在关联。VAMP7存在于lamp1阳性结构中,并介导它们与质膜的融合。TIR-FRAP实验显示VAMP7-GFP和TRPM8-mCherry在移动细胞中动态共定位
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引用次数: 0
Interactions in human performance: An individual and combined stressors approach 人类表现中的相互作用:个体和组合压力源方法
Pub Date : 2016-05-17 DOI: 10.1080/23328940.2016.1189991
Alex B. Lloyd, G. Havenith
In many clinical, ergonomic and sporting contexts, humans are exposed to environments that are suboptimal for physical and cognitive performance. This has prompted a substantial body research on the human response to heat, cold, hypoxia, noise, vibration, hypoand hyperbaria, as well as hyperand microgravity. However, working at environmental extremes can expose individuals to more than just a single stressor. Indeed, it is the combination of stressful factors which characterizes the ‘extreme’ nature of environments like high-altitude (e.g. hypobaric hypoxia, cold, solar radiation), deep-sea (e.g., hyperbaria, cold, inspiratory gas toxicity) and space (e.g. heat, cold, hypobaric normoxia, hyperand microgravity).
在许多临床、人体工程学和运动环境中,人类暴露在不利于身体和认知表现的环境中。这促使人们对人体对热、冷、缺氧、噪音、振动、低压和高压以及超重力和微重力的反应进行了大量的身体研究。然而,在极端环境下工作可能会使个人暴露于不止一种压力源。事实上,它是压力因素的组合,这些因素表征了环境的“极端”性质,如高海拔(例如,低压缺氧,寒冷,太阳辐射),深海(例如,高压,寒冷,吸入气体毒性)和空间(例如,热,冷,低压常氧,超和微重力)。
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引用次数: 33
期刊
Temperature: Multidisciplinary Biomedical Journal
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