Motor performance is preserved in healthy aged adults following severe whole-body hyperthermia

Brazaitis, Marius; Paulauskas, Henrikas; Eimantas, Nerijus; Daniusevičiūtė, Laura; Volungevičius, Gintautas; Skurvydas, Albertas

doi:10.1080/02656736.2018.1533650

Cited by 13 publications

(21 citation statements)

References 64 publications

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“…The required temperature (40°C) has to be reached within 1 min, considering the fact that the heating of joints at the beginning of movement takes approximately 5 min. After this time, the temperature in joints and muscles rises due to the physical activity and do not need external heating [20]. From the results presented in Figures 10 and 11, it can be seen that the temperature 40°C was reached within 1 min by applying 3 V for EFL1 specimen, 2.5 V for EFL2 and EFL3 specimens, and 1.5 V for EFH1, EFH2, and EFH3 specimens.…”

Section: Time-temperature (T-t) Characteristicsmentioning

confidence: 89%

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Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

Repon

Mikučionienė

Baltiņa

et al. 2021

Autex Research Journal

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This work deals with the electrically conductive textiles for heat generation in orthopedic compression supports. This study aimed to develop compression knitted structures with integrated electro-conductive yarns and investigate their heat generation characteristics and temperature changes during the time and under stretch which is required to generate compression. Combined half-Milano rib structured knitted fabrics were made by using silver (Ag) coated PA yarn of linear density of 66 tex and 235 tex, respectively. Six variants of specimens were developed by using different amount of electro-conductive yarns in a pattern repeat. It was found that stretch negatively influences temperature values as well as time in which the required temperature is reached. Therefore, the final wearing conditions have to be summed up during the designing of compression orthopedic heated supports.

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Section: Time-temperature (T-t) Characteristicsmentioning

confidence: 89%

“…Due to age-related loss of active muscle mass, the temperature of the skin and deep muscle decreases. Decrease in body temperature can profoundly change motor function and performance [20]. However, there is a lack of investigations in the fi eld of the heated compression supports used for orthopedic therapy in the literature.…”

Section: Introductionmentioning

confidence: 99%

Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

Repon

Mikučionienė

Baltiņa

et al. 2021

Autex Research Journal

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“…No local anesthesia was administered before insertion. After the first measurement, the insertion area was marked with a circle with a diameter of 0.5 cm to ensure that the same insertion point was used in later measurements (Brazaitis et al, 2019).…”

Section: Body Temperature Measurementsmentioning

confidence: 99%

Modulation of neuromuscular excitability in response to acute noxious heat exposure has no additional effects on central and peripheral fatigability

et al. 2022

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Background: Whole-body hyperthermia (WBH) has an adverse effect on the nervous system and neurophysiological performance. In the present study, we examined whether short-duration whole-body immersion in 45°C water (HWI-45°C), which produces a strong neural and temperature flux without inducing WBH, can increase or impair neurophysiological performance in humans.Methods: Fifteen men (aged 25 ± 6 years) were enrolled in this study and participated in three experiments: 1) a brief (5-min) immersion of the whole body in 37°C water (WI-37°C); 2) a brief (5-min) HWI-45°C; and 3) a control trial in a thermoneutral condition at an ambient temperature of 24°C and 60% relative humidity. Before and after the immersions, neuromuscular function (electromyographic activity, reflexes, electrically and voluntary induced torque production, voluntary muscle activation level) were tested. To provoke central inhibition, the participants performed a sustained 2-min maximal voluntary contraction (MVC).Results: Thermophysiological strain was greater after HWI-45°C than after WI-37°C. Electrophysiological modulations of motor drive transmission and peripheral modulations of muscle contractility properties in response to HWI-45°C seemed to have little effect on central activation of the exercising muscles and no effect on MVC production.Conclusion: Although exposure to acute noxious heat was effective in evoking neuromuscular excitability, the increases in core temperature (∼0.2°C) and muscle temperature (∼0.6°C) did not induce moderate or severe WBH. These changes did not seem to affect central structures; that is, there were no additional increases in central and/or peripheral fatigue during a sustained 2-min MVC.

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“…The water bath temperature was approximately 44 C, and the participants were immersed to the waistline. The immersion continued until the T re increased to 39.5 C, and the exposure time required to achieve this T re was recorded [17]. Ratings of heat perception, heart rate (HR), and T re were recorded every 5 min throughout the warming procedure.…”

Section: Experimental Designmentioning

confidence: 99%

Effects of severe whole-body hyperthermia on ovarian hormone and extracellular Hsp72 responses in young adult women

Brazaitis

Eimantas

Baranauskienė

et al. 2019

International Journal of Hyperthermia

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Background: Although acute thermal stress appears to be one of the most effective stressors that increase the intra-and extracellular concentrations of heat shock protein 72 (Hsp72), 17b-estradiol has been shown to inhibit heat-induced Hsp72 expression. Materials and Methods: To determine whether severe whole-body hyperthermia (increase in rectal temperature up to 39.5 C) induced by lower-body heating is a sufficient stimulus to modulate hormonal (17b-estradiol, progesterone, prolactin, epinephrine, and norepinephrine) and extracellular Hsp72 responses, we investigated young adult women (21 ± 1 yr). Results and Conclusions: In the present study, we show that a severe whole-body hyperthermia (increase in rectal temperature of approximately 2.6 C and heart rate of approximately 80 bpm from baseline) was sufficient to increase 17b-estradiol, progesterone, and prolactin and catecholamine norepinephrine concentration. Moreover, we show that the concentration of extracellular Hsp72 and catecholamine epinephrine were not affected by severe whole-body hyperthermia in young adult women. From the functional point of view, expression of ovarian hormones induced by passive heat stress may have therapeutic potential for young adult women in, for example, estrogen treatment and overall women's health.

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Motor performance is preserved in healthy aged adults following severe whole-body hyperthermia

Cited by 13 publications

References 64 publications

Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

Ag Coated Pa-Based Electro-Conductive Knitted Fabrics for Heat Generation in Compression Supports

Modulation of neuromuscular excitability in response to acute noxious heat exposure has no additional effects on central and peripheral fatigability

Effects of severe whole-body hyperthermia on ovarian hormone and extracellular Hsp72 responses in young adult women

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