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https://www.readbyqxmd.com/read/28195970/reduction-of-physiological-strain-under-a-hot-and-humid-environment-by-a-hybrid-cooling-vest
#1
Albert P C Chan, Y Yang, Francis K W Wong, Michael C H Yam, Del P Wong, W F Song
Cooling treatment is regarded as one of good practices to provide safe training conditions to athletic trainers in the hot environment. The present study aimed to investigate whether wearing a commercial lightweight and portable hybrid cooling vest that combines air ventilation fans with frozen gel packs was an effective means to reduce participants' body heat strain. In this within-subject repeated measures study, 10 male volunteers participated in two heat-stress trials (one with the cooling vest - COOL condition, and another without - CON condition, in a randomized order) inside a climatic chamber with a controlled ambient temperature 33 °C and relative humidity (RH) 75% on an experimental day...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28183441/similar-metabolic-response-to-lower-versus-upper-body-interval-exercise-or-endurance-exercise
#2
Monique E Francois, Matthew J Graham, Evelyn B Parr, Nancy J Rehrer, Samuel J E Lucas, Stasinos Stavrianeas, James D Cotter
PURPOSE: To compare energy use and substrate partitioning arising from repeated lower- versus upper-body sprints, or endurance exercise, across a 24-h period. METHODS: Twelve untrained males (24±4 y) completed three trials in randomized order: (1) repeated sprints (five 30-s Wingate, 4.5-min recovery) on a cycle ergometer (SITLegs); (2) 50-min continuous cycling at 65% V̇O2max (END); (3) repeated sprints on an arm-crank ergometer (SITArms). Respiratory gas exchange was assessed before and during exercise, and at eight points across 22h of recovery...
March 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28177717/a-systematic-upregulation-of-nuclear-and-mitochondrial-genes-is-not-present-in-the-initial-post-exercise-recovery-period-in-human-skeletal-muscle
#3
Trisha D Scribbans, Brittany A Edgett, Jacob T Bonafiglia, Brittany L Baechler, Joe Quadrilatero, Brendon J Gurd
The purpose of the current investigation was to determine if an exercise-mediated upregulation of nuclear and mitochondrial-encoded genes targeted by the transcriptional co-activator peroxisome-proliferator-activated receptor gamma co-activator-1 alpha (PGC-1α) occurs in a systematic manner following different exercise intensities in humans. Ten recreationally active males (Age: 23 ±3 yrs; VO2peak: 41.8 ±6.6 mL/kg/min) completed two acute bouts of work-matched interval exercise at ~73% (LO) and ~100% (HI) of work rate at VO2peak in a randomized cross-over design...
January 17, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28165398/review-and-extension-of-co%C3%A2-based-methods-to-determine-ventilation-rates-with-application-to-school-classrooms
#4
Stuart Batterman
The ventilation rate (VR) is a key parameter affecting indoor environmental quality (IEQ) and the energy consumption of buildings. This paper reviews the use of CO₂ as a "natural" tracer gas for estimating VRs, focusing on applications in school classrooms. It provides details and guidance for the steady-state, build-up, decay and transient mass balance methods. An extension to the build-up method and an analysis of the post-exercise recovery period that can increase CO₂ generation rates are presented. Measurements in four mechanically-ventilated school buildings demonstrate the methods and highlight issues affecting their applicability...
February 4, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28149383/physical-fitness-and-performance-of-polish-ice-hockey-players-competing-at-different-sports-levels
#5
Robert Roczniok, Arkadiusz Stanula, Tomasz Gabryś, Urszula Szmatlan-Gabryś, Artur Gołaś, Petr Stastny
The study aimed to determine the values of selected aerobic and anaerobic capacity variables, physical profiles, and to analyze the results of on-ice tests performed by ice-hockey players relegated to a lower league. Performance of 24 ice-hockey players competing in the top league in the 2012/2013 season was analysed to this end. In the 2013/2014 season, 14 of them still played in the top league (the control group), while 10 played in the first league (the experimental group). The study was conducted one week after the end of the playoffs in the seasons under consideration...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28145006/post-exercise-recovery-regimes-blowing-hot-and-cold
#6
Jamie S McPhee, Adam P Lightfoot
No abstract text is available yet for this article.
February 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28134132/heart-rate-complexity-analysis-in-brugada-syndrome-during-physical-stress-testing
#7
M Calvo, P Gomis, D Romero, V Le Rolle, N Béhar, P Mabo, A Hernández
Symptoms such as ventricular arrhythmias in Brugada syndrome (BS) typically occur at rest, especially during sleep, suggesting that the autonomic nervous system (ANS) function may be relevant in the arrhythmogenesis of the disease. The aim of this work was to assess the ANS response captured by nonlinear heart rate variability (HRV) measures in 69 patients diagnosed with BS, who underwent a standardized physical stress test. Heart rate complexity (HRC) was evaluated by the power-law scaling analysis (β slope) during rest, exercise, recovery and rest post-recovery, in order to discriminate between symptomatic and asymptomatic BS patients...
February 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28116880/post-exercise-recovery-of-biological-clinical-and-metabolic-variables-after-different-temperatures-and-durations-of-cold-water-immersion-a-randomized-clinical-trial
#8
Franciele M Vanderlei, Maíra C DE Albuquerque, Aline C DE Almeida, Aryane F Machado, Jayme Netto, Carlos M Pastre
BACKGROUND: Cold water immersion (CWI) is a commonly used recuperative strategy. However there is a lack of standardization of protocols considering the duration and temperature of application of the technique and the stress model. Therefore is it important to study the issue of dose response in a specific stress model. Thus the objective was to analyze and compare the effects of CWI during intense post-exercise recovery using different durations and temperatures of immersion. METHODS: 105 male individuals were divided into five groups: one control group (CG) and four recovery groups (G1: 5' at 9±1°C; G2: 5' at 14±1oC; G3: 15' at 9±1°C; G4: 15' at 14±1°C)...
January 23, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28104750/gene-networks-in-skeletal-muscle-following-endurance-exercise-are-co-expressed-in-blood-neutrophils-and-linked-with-blood-inflammation-markers
#9
James A Broadbent, Dayle Sampson, Surendran Sabapathy, Luke J Haseler, Karl-Heinz Wagner, Andrew Cameron Bulmer, Jonathan M Peake, Oliver Neubauer
It remains incompletely understood whether there is an association between the transcriptome profiles of skeletal muscle and blood leukocytes in response to exercise or other physiological stressors. We have previously analyzed the changes in the muscle and blood neutrophil transcriptome in eight trained men before and 3 h, 48 h and 96 h after 2 h cycling and running. Because we collected muscle and blood in the same individuals and under the same conditions, we were able to directly compare gene expression between the muscle and blood neutrophils...
January 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28013058/leg-compressions-improve-ventilatory-efficiency-while-reducing-peak-and-post-exercise-blood-lactate-but-does-not-improve-perceived-exertion-exercise-economy-or-aerobic-exercise-capacity-in-endurance-trained-runners
#10
Eric Rivas, John D Smith, Nestor W Sherman
PURPOSE: The objective of this study was to determine if leg compressions would alter cardiorespiratory and perceived exertion measures during rest, submaximal and maximal exercise in endurance-trained runners. METHOD: Thirteen young, endurance trained runners (10 males, 20.9±3y, 58.9±5.7mlkgmin(-1)) completed a randomized design, leg compressions and non-compression control condition. The incremental graded exercise test consisted of baseline rest and submaximal intensities at 23%, 70%, 75%, 85% and then a progressive increase to 100% VO2max...
March 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/27979984/haemodynamic-response-to-muscle-reflex-is-abnormal-in-patients-with-heart-failure-with-preserved-ejection-fraction
#11
Silvana Roberto, Gabriele Mulliri, Raffaele Milia, Roberto Solinas, Virginia Pinna, Gianmarco Sainas, Massimo F Piepoli, Antonio Crisafulli
The aim of the present investigation was to assess the role of cardiac diastole on the hemodynamic response to metaboreflex activation. We wanted to determine whether patients with diastolic function impairment showed a different hemodynamic response as compared to normal subjects during this reflex. Hemodynamics during the metaboreflex activation obtained by post-exercise muscle ischemia (PEMI) was assessed in 10 patients with diagnosed heart failure with preserved ejection fraction (HFpEF) and in 12 age-matched healthy controls (CTL)...
December 15, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27932676/recovery-of-central-and-peripheral-neuromuscular-fatigue-after-exercise
#12
Timothy John Carroll, Janet L Taylor, Simon C Gandevia
Sustained physical exercise leads to a reduced capacity to produce voluntary force that typically outlasts the exercise bout. This "fatigue" can be due both to impaired muscle function, termed "peripheral fatigue", and a reduction in the capacity of the central nervous system to activate muscles, termed "central fatigue". In this mini-review we consider the factors that determine the recovery of voluntary force generating capacity after various types of exercise. After brief, high-intensity exercise there is typically a rapid restitution of force that is due to recovery of central fatigue (typically within 2min) and aspects of peripheral fatigue associated with excitation-contraction coupling and re-perfusion of muscles (typically within 3-5 min)...
December 8, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27916799/pre-sleep-protein-ingestion-to-improve-the-skeletal-muscle-adaptive-response-to-exercise-training
#13
REVIEW
Jorn Trommelen, Luc J C van Loon
Protein ingestion following resistance-type exercise stimulates muscle protein synthesis rates, and enhances the skeletal muscle adaptive response to prolonged resistance-type exercise training. As the adaptive response to a single bout of resistance exercise extends well beyond the first couple of hours of post-exercise recovery, recent studies have begun to investigate the impact of the timing and distribution of protein ingestion during more prolonged recovery periods. Recent work has shown that overnight muscle protein synthesis rates are restricted by the level of amino acid availability...
November 28, 2016: Nutrients
https://www.readbyqxmd.com/read/27909225/recovery-of-the-immune-system-after-exercise
#14
Jonathan M Peake, Oliver Neubauer, Neil P Walsh, Richard J Simpson
The notion that prolonged, intense exercise causes an 'open window' of immunodepression during recovery after exercise is well accepted. Repeated exercise bouts or intensified training without sufficient recovery may increase the risk of illness. However, except for salivary IgA, clear and consistent markers of this immunodepression remain elusive. Exercise increases circulating neutrophil and monocyte counts, and reduces circulating lymphocyte count during recovery. This lymphopenia results from preferential egress of lymphocyte subtypes with potent effector functions (e...
December 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27895592/effects-of-six-months-training-on-physical-capacity-and-metaboreflex-activity-in-patients-with-multiple-sclerosis
#15
Sara Magnani, Sergio Olla, Massimiliano Pau, Girolamo Palazzolo, Filippo Tocco, Azzurra Doneddu, Maura Marcelli, Andrea Loi, Federica Corona, Francesco Corona, Giancarlo Coghe, Maria G Marrosu, Alberto Concu, Eleonora Cocco, Elisabetta Marongiu, Antonio Crisafulli
Patients with multiple sclerosis (MS) have an increased systemic vascular resistance (SVR) response during the metaboreflex. It has been hypothesized that this is the consequence of a sedentary lifestyle secondary to MS. The purpose of this study was to discover whether a 6-month training program could reverse this hemodynamic dysregulation. Patients were randomly assigned to one of the following two groups: the intervention group (MSIT, n = 11), who followed an adapted training program; and the control group (MSCTL, n = 10), who continued with their sedentary lifestyle...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27872595/redox-mechanism-of-reactive-oxygen-species-in-exercise
#16
REVIEW
Feng He, Juan Li, Zewen Liu, Chia-Chen Chuang, Wenge Yang, Li Zuo
It is well known that regular exercise can benefit health by enhancing antioxidant defenses in the body. However, unaccustomed and/or exhaustive exercise can generate excessive reactive oxygen species (ROS), leading to oxidative stress-related tissue damages and impaired muscle contractility. ROS are produced in both aerobic and anaerobic exercise. Mitochondria, NADPH oxidases and xanthine oxidases have all been identified as potential contributors to ROS production, yet the exact redox mechanisms underlying exercise-induced oxidative stress remain elusive...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27871846/the-oxidant-antioxidant-equilibrium-activities-of-selected-lysosomal-enzymes-and-activity-of-acute-phase-protein-in-peripheral-blood-of-18-year-old-football-players-after-aerobic-cycle-ergometer-test-combined-with-ice-water-immersion-or-recovery-at-room-temperature
#17
Paweł Sutkowy, Alina Woźniak, Tomasz Boraczyński, Michał Boraczyński, Celestyna Mila-Kierzenkowska
The goal of the study was to evaluate the effect of an aerobic exercise bout followed by ice-water immersion or recovery at room temperature on the redox state, activities of selected lysosomal enzymes and activity of α1-antitrypsin (AAT) in the blood of healthy sportsmen. Eleven amateur football players aged 18 were randomly assigned to two similar 30-min aerobic cycle ergometer tests followed by a recovery at room temperature (20 °C; Experiment 1) or ice-water immersion (3 °C, 5 min; Experiment 2). Peripheral blood was collected three times during both study experiments: before (baseline), as well as 20 and 40 min after the recovery or immersion...
November 18, 2016: Cryobiology
https://www.readbyqxmd.com/read/27861911/metabolism-of-ketone-bodies-during-exercise-and-training-physiological-basis-for-exogenous-supplementation
#18
Mark Evans, Karl E Cogan, Brendan Egan
Optimising training and performance through nutrition strategies is central to supporting elite sportspeople, much of which has focused on manipulating the relative intake of carbohydrate and fat and their contributions as fuels for energy provision. The ketone bodies, namely acetoacetate, acetone and β-hydroxybutyrate (βHB), are produced in the liver during conditions of reduced carbohydrate availability and serve as an alternative fuel source for peripheral tissues including brain, heart and skeletal muscle...
November 10, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27856715/highlighted-topics-recovery-from-exercise-recovery-responses-of-testosterone-growth-hormone-and-igf-1-after-resistance-exercise
#19
William J Kraemer, Nicholas A Ratamess, Bradley C Nindl
The complexity of the endocrine pathways during recovery related to anabolic function belie an over simplistic approach to its study. This review is to examines the role of resistance exercise (RE) on the recovery responses of three major anabolic hormones testosterone, growth hormone(s) and insulin-like growth factor-I. Each hormone has a complexity related to differential pathways of action as well as interactions with binding proteins and receptor interactions. Testosterone is the primary anabolic hormone and its concentration changes during the recovery period depending upon the up- or down-regulation of the androgen receptor...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27846044/impact-of-exercise-intensity-and-duration-on-postexercise-executive-function
#20
Hayato Tsukamoto, Saki Takenaka, Tadashi Suga, Daichi Tanaka, Tatsuya Takeuchi, Takafumi Hamaoka, Tadao Isaka, Takeshi Hashimoto
PURPOSE: The impact of exercise volume represented by exercise intensity and duration on post-exercise executive function (EF) improvement remains unclear. In the present study, involving 2 volume-controlled evaluations, we aimed to compare acute exercise protocols with differing intensities and durations in order to establish an effective exercise protocol for improving EF. METHODS: In study 1, 12 healthy male subjects performed cycle ergometer exercise, based on a low-intensity (LI) protocol for 20 min (LI20), moderate-intensity (MI) protocol for 20 min (MI20), and MI20 volume-matched LI protocol for 40 min (LI40)...
November 11, 2016: Medicine and Science in Sports and Exercise
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