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Exercise Heat

Tessa Maroni, Brian Dawson, Myles Dennis, Louise Naylor, Carly Brade, Karen Wallman
This study aimed to assess the separate and combined effects of a cooling glove (CG) and a gel-cooling jacket (CJ) used during a half-time break on manual dexterity performance (Purdue Pegboard test) and subsequent repeat-sprint cycling performance in hot conditions. Twelve male athletes performed four experimental trials (within subjects, counterbalanced design) that consisted of: wearing a CG, wearing a CJ, combination of CG and CJ (CG+J) or a no-cooling control (NC) for 15 min during a 20 min half-time break performed between 2 x 30 min repeated-sprint cycling bouts in heat (35...
September 2018: Journal of Sports Science & Medicine
Sean R Notley, Robert D Meade, Andrew W D'Souza, Brian J Friesen, Glen P Kenny
PURPOSE: Prolonged work in the heat may exacerbate the rise in core temperature on the next work day, especially in older workers who display impairments in whole-body heat loss that increase body heat storage and core temperature relative to young adults during heat stress. We therefore evaluated whether whole-body heat loss in older adults was impaired on the day after prolonged work in the heat. METHODS: Whole-body heat exchange and heat storage were assessed in nine older (53-64 yr) men during three 30-min bouts of semirecumbent cycling at fixed rates of metabolic heat production (150 [Ex1], 200 [Ex2], 250 W·m [Ex3]), each separated by 15-min recovery, in hot-dry conditions (40°C, 20% relative humidity), immediately before (day 1), and on the day after (day 2) a prolonged, work simulation (~7...
September 2018: Medicine and Science in Sports and Exercise
Mona Askar, Abdelaziz M Hussein, Soheir Al-Basiony, Refka Meseha, Emile Metias, Mohamed Salama, Ashraf Antar, Aya El Sayed
In this study we aimed to investigate and to compare the effects of ferulic acid (FR), muscle exercise (Ex) and combination of them on rotenone (ROT)-induced Parkinson disease (PD) in mice as well as their underlying mechanisms. Thirty five male C57BL/6 mice were allocated into 5 equal groups, 1) Normal control (CTL) group, 2) ROT group (rats received ROT 3 mg/Kg i.p. for 70 days), 3) FR group (rats received ROT + FR at 20 mg/kg/day), 4) Ex group (rats received ROT + swimming Ex) and 5) FR+Ex group (rats received ROT + FR and Ex)...
August 15, 2018: CNS & Neurological Disorders Drug Targets
Jeff Moore, Sarah Northway, Nicole Wells, Emily Woolf, Michael J Buono
BACKGROUND: The purpose of this study was to measure sweat rate during exercise in the heat after directly inhibiting carbonic anhydrase (CA) in eccrine sweat glands via transdermal iontophoresis of acetazolamide. It was hypothesized that if CA was important for sweat production, local administration of acetazolamide, without the confounding systemic effects of dehydration typically associated with past studies, would have a significant effect on sweat rate during exercise. METHODS: Ten healthy subjects volunteered to exercise in the heat following acetazolamide or distilled water iontophoresis on the forearm...
August 13, 2018: Journal of Basic and Clinical Physiology and Pharmacology
Nicole T Vargas, Christopher L Chapman, James R Sackett, Blair D Johnson, Rob Gathercole, Zachary J Schlader
INTRODUCTION: This study tested the hypothesis that females rely on thermal behavior to a greater extent during and following exercise, relative to males. METHODS: In a 24±1°C; (45±10% RH) environment, 10 males (M) and 10 females (F) (22±2 y) cycled for 60 min (metabolic heat production-M: 117±18; F: 129±21 W·m), followed by 60 min recovery. Mean skin and core temperatures, skin blood flow and local sweat rates were measured continually. Subjects controlled the temperature of their dorsal neck to perceived thermal comfort using a custom-made device...
August 8, 2018: Medicine and Science in Sports and Exercise
Ji Hyun Kim, Quan Feng Liu, Enerelt Urnuhsaikhan, Ha Jin Jeong, Mi Yang Jeon, Songhee Jeon
Exercise increases the levels of neurogenic factors and enhances neurogenesis, memory, and learning. However, the molecular link between exercise and neurogenesis is not clear. The purpose of this study was to examine the effects of exercise intensity on cognitive function and protein expression in the hippocampus of old mice. To compare the effects of aerobic exercise intensity on cognition in old mice, we exposed 18-month-old mice to low- and moderate-intensity treadmill exercise for 4 weeks. Moderate-intensity exercise improved cognitive function in the old mice, while low-intensity exercise did not...
August 8, 2018: Molecular Neurobiology
Claire E Trotter, Faith K Pizzey, Philip M Batterson, Robert A Jacobs, James Pearson
We investigated whether small reductions in skin temperature sixty seconds after the onset of a simulated hemorrhagic challenge would improve tolerance to lower body negative pressure (LBNP) following exercise heat stress. Eleven healthy subjects completed two trials (High and Reduced). Subjects cycled at ~55% VO2max wearing a warm water perfused suit until core temperatures increased by ~1.2°C before laying supine and undergoing LBNP to pre syncope. LBNP tolerance was quantified as cumulative stress index (CSI: product of each LBNP level multiplied by time; mmHg*min)...
August 8, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Yuta Komano, Kazunori Shimada, Hisashi Naito, Kosuke Fukao, Yoshihiko Ishihara, Toshio Fujii, Takeshi Kokubo, Hiroyuki Daida
BACKGROUND: Lactococcus lactis JCM 5805 (LC-Plasma) is a unique lactic acid bacteria (LAB) which activates plasmacytoid dendritic cells (pDC). We aimed to evaluate the effect of LC-Plasma on dendritic cell (DC) activity and subjective indices of upper respiratory tract infections (URTI) and fatigue in athletes under high intensity exercise. METHODS: We conducted a randomized, placebo-controlled, double-blinded trial. Fifty-one male subjects belonging to a university sports club were randomized into placebo (n = 25) and LC-Plasma (n = 26) groups...
August 2, 2018: Journal of the International Society of Sports Nutrition
Dallon T Lamarche, Sean R Notley, Martin P Poirier, Glen P Kenny
We evaluated whether self-reported physical activity (PA) level modulates whole-body total heat loss (WB-THL) as assessed using direct calorimetry in ten young adults (22±3 years) matched for rate of peak oxygen consumption (V̇O2peak; an index for aerobic fitness), but of low and high self-reported PA, during three incremental cycling bouts (~39, 52, and 64% V̇O2peak) in the heat (40ºC). We showed that level of self-reported PA does not appear to influence WB-THL independently of V̇O2peak.
July 31, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Thora Jenny Gunnarsdottir, Runar Vilhjalmsson, Ingibjorg Hjaltadottir
INTRODUCTION: Complementary therapies may have positive effect on residents in nursing homes. The aim of this research was to investigate what kind of complementary therapies are provided in Icelandic nursing homes and who are the providers. Also whether the nursing homes need assistance to support the use of such therapies. METHOD: A questionnaire was mailed to all the nursing homes in Iceland (N = 59). Total of forty-five nursing homes replied or 76% response rate...
August 2018: Complementary Therapies in Clinical Practice
Carlos Henrique de Lemos Muller, Anderson Rech, Cíntia Ehlers Botton, Helena Trevisan Schroeder, Patricia Martins Bock, Juliano Boufleur Farinha, Pedro Lopez, Cinthia Maria Schöler, Gisele Bettú Grigolo, Jerônimo Coelho, Lucas Stahlhöfer Kowalewski, Maria Inês Lavina Rodrigues, Marcela Alves de Azevedo, André Quincozes-Santos, Josianne Rodrigues-Krause, Alvaro Reischak-Oliveira, Ronei Silveira Pinto, Giuseppe De Vito, Paulo Ivo Homem de Bittencourt Júnior, Mauricio Krause
Recent evidence suggests that the anti-inflammatory heat shock response (HSR) is reduced in aging and diabetes. In this study we compared HSR between healthy middle-aged adults, healthy elderly and type 2 diabetic (T2DM) elderly, and tested whether resistance training (RT) could improve the HSR in T2DM group. Thirty sedentary participants volunteered for this study. HSR (assessed as the capacity to export HSP72 during heat stress) was measured in the blood and compared between the groups. HSR was similar between healthy middle-aged and healthy elderly volunteers, but diminished in elderly T2DM (p < 0...
July 25, 2018: Experimental Gerontology
Tugce Onal Balci, Ayla Cagliyan Turk, Fusun Sahin, Nurdan Kotevoglu, Banu Kuran
BACKGROUND: In treatment of adhesive capsulitis, deep heating agents have been shown to have positive effects on pain and function. OBJECTIVE: To evaluate if addition of ultrasound used in treatment of adhesive capsulitis will provide additional benefits. METHODS: Thirty patients with adhesive capsulitis were included in a prospective, double-blind, randomized controlled trial. Hotpack, TENS (Transcutaneus Electrical Nerve Stimulation), exercise and active ultrasound therapies were applied to the first group (n= 15), whereas sham ultrasound was applied to the second group (n= 15) in addition to hotpack, TENS and exercise...
July 20, 2018: Journal of Back and Musculoskeletal Rehabilitation
(no author information available yet)
No abstract text is available yet for this article.
August 2018: Journal of Strength and Conditioning Research
Levente Kovács, Fruzsina Luca Kézér, Ferenc Ruff, Viktor Jurkovich, Ottó Szenci
Changes in non-invasive stress biomarkers were studied in shaded (n = 8) and non-shaded (n = 8) Holstein bull calves exposed to extreme heat load conditions in a continental region. Ambient temperature and humidity data were recorded for the S and NS hutch and exercise pen environments. Temperature-humidity-index (THI) was also calculated. Respiratory rate, rectal temperature, heart rate, and the root mean square of successive differences between R-R intervals (RMSSD) were recorded as animal-based indicators during three periods: (1) day 1, control day, during which all calves were shaded for 24 h (shade removal from non-shaded calves at 2400 h); (2) day 2, heat stress day, with shade over shaded calves; and (3) days 3-5, post-stress period, with shade over shaded calves...
July 21, 2018: International Journal of Biometeorology
Margherita Raccuglia, Christian Heyde, Alex Lloyd, Simon Hodder, George Havenith
PURPOSE: Moisture accumulation in clothing affects human performance and productivity through its impact on thermal balance and various aspects of discomfort. Building on our laboratory's work on mapping sweat production across the body, this study aimed to obtain detailed spatial and temporal maps showing how this sweat migrates into a single clothing layer (T-shirt) during physical exercise. METHOD: Eight male participants performed running exercise in a warm environment...
July 19, 2018: European Journal of Applied Physiology
Thomas K Pellinger, Catherine B Neighbors, Grant H Simmons
BACKGROUND/OBJECTIVE: In this pilot study, we tested the hypothesis that acute lower leg heating (LLH) increases postheating popliteal artery blood flow and 6-minute walk distance in patients with peripheral artery disease (PAD). METHODS: Six patients (5 male, 1 female) with PAD (69 ± 6.9 years; claudication: ankle-brachial index < 0.90) participated in 3 randomized treatment sessions (2-7 days apart): control or bilateral LLH conducted via water bath immersion (42°C; ~40-cm depth) for either 15 or 45 minutes...
July 18, 2018: Journal of Cardiovascular Nursing
Paul Samuel Hafen, Coray N Preece, Jacob R Sorensen, Chad R Hancock, Robert D Hyldahl
The heat stress response is associated with several beneficial adaptations that promote cell health and survival. Specifically, in vitro and animal investigations suggest that repeated exposures to a mild heat stress (~40°C) elicits positive mitochondrial adaptations in skeletal muscle comparable to those observed with exercise. To assess whether such adaptations translate to human skeletal muscle, we produced local, deep tissue heating of the vastus lateralis via pulsed shortwave diathermy in 20 men (n=10) and women (n=10)...
July 19, 2018: Journal of Applied Physiology
Raphaëlle Chrétien, Sarah Lavoie, Philippe Chalaye, Emmanuelle de Vette, François-Pierre Counil, Frédéric Dallaire, Sylvie Lafrenaye
Background and aims Chronic pain is affecting a growing number of individuals including adolescents. Different endogenous pain inhibitory systems could confer protection against development of chronic pain. Decreased pain perception can be observed following intense pain (i.e. conditioned pain modulation - CPM) or after physical exercise (i.e. exercise-induced analgesia - EIA). Reduced effectiveness of pain inhibitory mechanisms have been reported in several chronic pain conditions. However, the extent of these dysfunctions has not been thoroughly investigated in adolescents suffering from chronic pain...
July 14, 2018: Scandinavian Journal of Pain
Daemon L Cline, Landon I Short, Maeghan A M Forster, Sarah L Gray
Obesity arises from disrupted energy balance and is caused by chronically higher energy intake compared to expenditure via basal metabolic rate, exercise, and thermogenesis. The brown adipose tissue (BAT), the primary thermogenic organ, has received considerable attention as a potential therapeutic target due to its ability to burn lipids in the production of heat. Pituitary adenylate cyclase-activating polypeptide (PACAP) has been identified as a key regulator of the physiological stress response both centrally and peripherally...
July 7, 2018: Journal of Molecular Neuroscience: MN
B Wojcik, M Knapp, J Gorski
Ischemic heart conditioning has been shown to protect the organ against ischemia/reperfusion injury. Animal studies have revealed that the heart can also be conditioned by non-ischemic procedures, namely physical exercise and tachycardia. Long and short term endurance training, sprint training, resistance or interval training and even one bout of exercise induce cardiac preconditioning, which is manifested by a reduction in post ischemia/reperfusion infarct size, ventricular arrhythmia and improved heart function...
April 2018: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
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