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https://www.readbyqxmd.com/read/28344454/the-effect-of-intermittent-head-cooling-on-aerobic-performance-in-the-heat
#1
Peter Walters, Nathaniel Thom, Kai Libby, Shelby Edgren, Amanda Azadian, Daniel Tannous, Elisabeth Sorenson, Brian Hunt
Thermoregulation is critical for athletes, particularly those for those who must perform in the heat. Most strategies aimed at reducing heat stress have cooled participants before or during activity. The objective of this study is to investigate whether seven minutes of head cooling applied between bouts of aerobic exercise in hot (35 ± 1.0 °C) and dry (14.68 ±4.29% rh) environmental conditions could positively effect participants peak power output (PP) on a maximal effort graded exercise test (GXT). Twenty-two recreational active men ages 18 to 23 (19...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28343570/supplemental-intermittent-day-heat-training-and-the-lactate-threshold
#2
Stuart Gollan, Samuel Chalmers, Stephen Alderton, Kevin Norton
Heat acclimation over consecutive days has been shown to improve aerobic-based performance. Recently, it has been suggested that heat training can improve performance in a temperate environment. However, due to the multifactorial training demands of athletes, consecutive-day heat training may not be suitable. The current study aimed to investigate the effect of brief (8×30min) intermittent (every 3-4 days) supplemental heat training on the second lactate threshold point (LT2) in temperate and hot conditions...
April 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/28336535/the-effects-of-short-work-versus-longer-work-periods-within-intermittent-exercise-on-v%C3%AC-o2p-kinetics-muscle-deoxygenation-and-energy-system-contribution
#3
Michael Christopher McCrudden, Daniel A Keir, Glen R Belfry
We examined the effects of inserting 3 s recovery periods during high-intensity cycling exercise at 25 s and 10 s intervals on pulmonary oxygen uptake (V̇O2p), muscle deoxygenation (HHb), associated kinetics (τ), and energy system contributions. Eleven men (24±3 years) completed two trials of three cycling protocols: an 8 min continuous protocol (CONT) and two, 8 min intermittent exercise protocols with work-to-rest periods of 25 s-to-3 s (25INT) and 10 s-to-3 s (10INT). Each protocol began with a step-transition from a 20 W baseline to a power output (PO) of 60% between lactate threshold and maximal V̇O2p (Δ60)...
March 23, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#4
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 22, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28328166/treatment-of-subchondral-lucencies-in-the-medial-proximal-radius-with-a-bone-screw-in-8-horses
#5
Imma Roquet, J Lane Easter, Richard P C Coomer, Luis J Ezquerra, Chad A Marsh, Steve S Trostle, Elizabeth M Santschi
OBJECTIVE: To describe the results of screw placement through subchondral lucencies (SCL) of the proximal radius in 8 horses. STUDY DESIGN: Retrospective clinical study. ANIMALS: Horses with cubital SCL causing lameness (n=8). METHODS: Medical record review and clinical follow-up. RESULTS: Eight horses with SCL in the proximal radius causing lameness were treated with a screw placed across the lucency...
March 22, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28327503/beetroot-juice-supplementation-improves-high-intensity-intermittent-type-exercise-performance-in-trained-soccer-players
#6
Jean Nyakayiru, Kristin L Jonvik, Jorn Trommelen, Philippe J M Pinckaers, Joan M Senden, Luc J C van Loon, Lex B Verdijk
It has been shown that nitrate supplementation can enhance endurance exercise performance. Recent work suggests that nitrate ingestion can also increase intermittent type exercise performance in recreational athletes. We hypothesized that six days of nitrate supplementation can improve high-intensity intermittent type exercise performance in trained soccer players. Thirty-two male soccer players (age: 23 ± 1 years, height: 181 ± 1 m, weight: 77 ± 1 kg, playing experience: 15.2 ± 0.5 years, playing in the first team of a 2nd or 3rd Dutch amateur league club) participated in this randomized, double-blind cross-over study...
March 22, 2017: Nutrients
https://www.readbyqxmd.com/read/28323322/adaptations-following-an-intermittent-hypoxia-hyperoxia-training-in-coronary-artery-disease-patients-a-controlled-study
#7
Oleg Glazachev, Phylipp Kopylov, Davide Susta, Elena Dudnik, Elena Zagaynaya
BACKGROUND: Repeated exposure to intermittent normobaric hypoxia improves exercise tolerance in cardiac patients. Little is known on the effects of intermittent normobaric hypoxia-hyperoxia exposure in coronary artery disease (CAD) patients (New York Heart Association II-III). HYPOTHESIS: IHHT improves exercise tolerance, cardiometabolic profile, and quality of life in CAD patients. METHODS: The study design was a nonrandomized, controlled, before-and-after trial...
March 21, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28318450/repeated-sprints-in-fasted-state-impair-reaction-time-performance
#8
Anissa Cherif, Romain Meeusen, Abdulaziz Farooq, Walid Briki, Mohamed Amine Fenneni, Karim Chamari, Bart Roelands
OBJECTIVE: The aim of this study was to assess the effects of 3-day Islamic intermittent fasting (3d-IF) on cognitive performance and serum levels of neurotrophic factors (brain-derived neurotrophic factor [BDNF] and vascular endothelial growth factor [VEGF]) before and after repeated sprints. METHODS: Twenty-one physically active male Muslims (29.8 ± 5.9 years, exercising 4 ± 1.5 times/week) were randomly assigned to one of 2 experimental sessions: the control or nonfasting session (CS) or the fasting session (FS)...
March 20, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28316054/the-effect-of-fluid-intake-following-dehydration-on-subsequent-athletic-and-cognitive-performance-a-systematic-review-and-meta-analysis
#9
REVIEW
Danielle McCartney, Ben Desbrow, Christopher Irwin
BACKGROUND: The deleterious effects of dehydration on athletic and cognitive performance have been well documented. As such, dehydrated individuals are advised to consume fluid in volumes equivalent to 1.25 to 1.5 L kg(-1) body mass (BM) lost to restore body water content. However, individuals undertaking subsequent activity may have limited time to consume fluid. Within this context, the impact of fluid intake practices is unclear. This systematic review investigated the effect of fluid consumption following a period of dehydration on subsequent athletic and cognitive performance...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28290065/does-stress-result-in-you-exercising-less-or-does-exercising-result-in-you-being-less-stressed-or-is-it-both-testing-the-bi-directional-stress-exercise-association-at-the-group-and-person-n-of-1-level
#10
Matthew M Burg, Joseph E Schwartz, Ian M Kronish, Keith M Diaz, Carmela Alcantara, Joan Duer-Hefele, Karina W Davidson
BACKGROUND: Psychosocial stress contributes to heart disease in part by adversely affecting maintenance of health behaviors, while exercise can reduce stress. Assessing the bi-directional relationship between stress and exercise has been limited by lack of real-time data and theoretical and statistical models. This lack may hinder efforts to promote exercise maintenance. PURPOSE: We test the bi-directional relationship between stress and exercise using real-time data for the average person and the variability-individual differences-in this relationship...
March 13, 2017: Annals of Behavioral Medicine: a Publication of the Society of Behavioral Medicine
https://www.readbyqxmd.com/read/28288203/the-effects-of-menstrual-cycle-phase-on-physical-performance-in-female-soccer-players
#11
Ross Julian, Anne Hecksteden, Hugh H K Fullagar, Tim Meyer
BACKGROUND: Female soccer has grown extensively in recent years, however differences in gender-specific physiology have rarely been considered. The female reproductive hormones which rise and fall throughout the menstrual cycle, are known to affect numerous cardiovascular, respiratory, thermoregulatory and metabolic parameters, which in turn, may have implications on exercise physiology and soccer performance. Therefore, the main aim of the present study was to investigate potential effects of menstrual cycle phase on performance in soccer specific tests...
2017: PloS One
https://www.readbyqxmd.com/read/28285932/calf-raise-exercise-increases-walking-performance-in-patients-with-intermittent-claudication
#12
Michel Van Schaardenburgh, Martin Wohlwend, Øivind Rognmo, Erney Mattsson
BACKGROUND: Symptoms of intermittent claudication (IC) are improved by exercise. The improvement might be secondary to increased blood perfusion or increased muscle mitochondrial capacity. Ischemia followed by reperfusion, also named preconditioning, is known to stimulate the mitochondria. We focused on a calf raise exercise inducing preconditioning in the calf muscle of patients with IC. We hypothesized that 8 weeks of this exercise would increase walking performance and mitochondrial capacity without a change in blood flow...
March 9, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28285432/a-low-dose-6-week-bovine-colostrum-supplementation-maintains-performance-and-attenuates-inflammatory-indices-following-a-loughborough-intermittent-shuttle-test-in-soccer-players
#13
Yiannis Kotsis, Anastasia Mikellidi, Cleopatra Aresti, Eleni Persia, Aristomenis Sotiropoulos, Demosthenes B Panagiotakos, Smaragdi Antonopoulou, Tzortzis Nomikos
PURPOSE: The aim of the study was to investigate the effect of a 6-week, low-dose bovine colostrum (BC) supplementation on exercise-induced muscle damage (EIMD) and performance decline in soccer players following the Loughborough Intermittent Shuttle Test (LIST) during a competitive season period. METHODS: In a double-blind, randomized, placebo-controlled design, two groups of soccer players were allocated to a 3.2 g/day of whey protein (WP, N = 8) or BC (N = 10) and performed a pre- and a post-supplementation LIST...
March 11, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28283799/encystment-of-parasitic-freshwater-pearl-mussel-margaritifera-margaritifera-larvae-coincides-with-increased-metabolic-rate-and-haematocrit-in-juvenile-brown-trout-salmo-trutta
#14
Karl Filipsson, Jeroen Brijs, Joacim Näslund, Niklas Wengström, Marie Adamsson, Libor Závorka, E Martin Österling, Johan Höjesjö
Gill parasites on fish are likely to negatively influence their host by inhibiting respiration, oxygen transport capacity and overall fitness. The glochidia larvae of the endangered freshwater pearl mussel (FPM, Margaritifera margaritifera (Linnaeus, 1758)) are obligate parasites on the gills of juvenile salmonid fish. We investigated the effects of FPM glochidia encystment on the metabolism and haematology of brown trout (Salmo trutta Linnaeus, 1758). Specifically, we measured whole-animal oxygen uptake rates at rest and following an exhaustive exercise protocol using intermittent flow-through respirometry, as well as haematocrit, in infested and uninfested trout...
March 10, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28275109/intermittent-and-graded-exercise-effects-on-nk-cell-degranulation-markers-lamp-1-lamp-2-and-cd8-cd38-in-chronic-fatigue-syndrome-myalgic-encephalomyelitis
#15
Suzanne Broadbent, Rosanne Coutts
There is substantial evidence of immune system dysfunction in chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) but little is understood of exercise training effects on lymphocyte function in this illness. This study investigated whether graded and intermittent exercise improved CD8(+) lymphocyte activation and natural killer cell degranulation markers compared to no exercise. Twenty-four chronic fatigue syndrome (CFS) patients (50.2 ± 10 year) were randomized to graded exercise (GE), intermittent exercise (IE) or usual care (UC) groups; a control group (CTL) of 18 matched sedentary non-CFS/ME participants were included for immunological variable comparisons...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28265131/medical-treatment-for-postthrombotic-syndrome
#16
REVIEW
Federico Silva Palacios, Suman Wasan Rathbun
Deep vein thrombosis (DVT) is a prevalent disease. About 20 to 30% of patients with DVT will develop postthrombotic syndrome (PTS) within months after the initial diagnosis of DVT. There is no gold standard for diagnosis of PTS, but clinical signs include pitting edema, hyperpigmentation, phlebectatic crown, venous eczema, and varicose veins. Several scoring systems have been developed for diagnostic evaluation. Conservative treatment includes compression therapy, medications, lifestyle modification, and exercise...
March 2017: Seminars in Interventional Radiology
https://www.readbyqxmd.com/read/28261888/endurance-performance-in-well-trained-mice-is-enhanced-by-short-duration-intermittent-hypoxia-via-improved-muscle-fatty-acid-metabolism
#17
Junichi Suzuki
The author previously reported that short-duration intermittent hypoxia had additive effects on improvements in endurance capacity by enhancing fatty acid metabolism. The present study was designed to investigate the effects of short-duration intermittent hypoxia on endurance capacity in well-trained mice. Mice in the training group were housed in a cage with a wheel activity device for 7 weeks from 5 weeks old. Voluntary running markedly increased maximal exercise capacity (by 5.9-fold). Trained mice were then subjected to either normoxic treadmill training (Tr) or training with short-duration intermittent hypoxia (12% O2 for 15 min, 20...
March 5, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28255159/high-intensity-aerobic-exercise-training-improves-chronic-intermittent-hypoxia-induced-insulin-resistance-without-basal-autophagy-modulation
#18
Marion Pauly, Allan Assense, Aurélie Rondon, Amandine Thomas, Hervé Dubouchaud, Damien Freyssenet, Henri Benoit, Josiane Castells, Patrice Flore
Chronic intermittent hypoxia (IH) associated with obstructive sleep apnea (OSA) is a major risk factor for cardiovascular and metabolic diseases (insulin resistance: IR). Autophagy is involved in the pathophysiology of IR and high intensity training (HIT) has recently emerged as a potential therapy. We aimed to confirm IH-induced IR in a tissue-dependent way and to explore the preventive effect of HIT on IR-induced by IH. Thirty Swiss 129 male mice were randomly assigned to Normoxia (N), Intermittent Hypoxia (IH: 21-5% FiO2, 30 s cycle, 8 h/day) or IH associated with high intensity training (IH HIT)...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28253022/a-sodium-drink-enhances-fluid-retention-during-3-hours-of-post-exercise-recovery-when-ingested-with-a-standard-meal
#19
Gethin H Evans, Jennifer Miller, Sophie Whiteley, Lewis J James
The purpose of this study was to examine the efficacy of water and a 50 mmol/L NaCl solution on post-exercise rehydration when a standard meal was consumed during rehydration. Eight healthy participants took part in two experimental trials during which they lost 1.5 ± 0.4 % of initial body mass via intermittent exercise in the heat. Participants then rehydrated over a 60 minute period with water or a 50 mmol/L NaCl solution in a volume equivalent to 150% of their body mass loss during exercise. In addition, a standard meal was ingested during this time which was equivalent to 30% of participants predicted daily energy expenditure...
March 2, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28245246/oxygen-uptake-kinetics-and-energy-system-s-contribution-around-maximal-lactate-steady-state-swimming-intensity
#20
Jailton Gregório Pelarigo, Leandro Machado, Ricardo Jorge Fernandes, Camila Coelho Greco, João Paulo Vilas-Boas
The purpose of this study was to examine the oxygen uptake ([Formula: see text]) kinetics and the energy systems' contribution at 97.5, 100 and 102.5% of the maximal lactate steady state (MLSS) swimming intensity. Ten elite female swimmers performed three-to-five 30 min submaximal constant swimming bouts at imposed paces for the determination of the swimming velocity (v) at 100%MLSS based on a 7 x 200 m intermittent incremental protocol until voluntary exhaustion to find the v associated at the individual anaerobic threshold...
2017: PloS One
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