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https://www.readbyqxmd.com/read/28533889/effects-of-low-dose-acetazolamide-on-exercise-performance-in-simulated-altitude
#1
Ernst Elisabeth, Gatterer Hannes, Burtscher Johannes, Faulhaber Martin, Pocecco Elena, Burtscher Martin
Preventive effects of acetazolamide (ACZ) on acute mountain sickness (AMS) are well established but effects on exercise performance at high altitude or in hypoxia have been less considered and are still inconsistent. We hypothesized that low-dose ACZ would not impair exercise performance at simulated high altitude. Thus, the aim of this study was to evaluate the interaction between low-dose ACZ and exercise performance in normobaric hypoxia. Sixteen subjects (8 males and 8 females) were randomly assigned either to receive low-dose ACZ (3×125 mg in 36 hours) or placebo...
2017: International Journal of Physiology, Pathophysiology and Pharmacology
https://www.readbyqxmd.com/read/28530450/the-dose-response-relationship-between-training-load-and-aerobic-fitness-in-academy-rugby-union-players
#2
Richard Taylor, Dajo Sanders, Tony Myers, Grant Abt, Celia A Taylor, Ibrahim Akubat
PURPOSE: The aim of this study was to identify the dose-response relationship between measures of training load (TL) and changes in aerobic fitness in academy rugby union players. METHODS: Training data from ten academy rugby union players was collected during a six-week in-season period. Participants completed a lactate threshold (LT) test which was used to assess VO2max and velocities at VO2max, 2 mmol·L(-1) (vLT) and 4 mmol·L(-1) (vOBLA) as measures of aerobic fitness...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28523961/chronotype-and-response-to-training-during-the-polar-night-a-pilot-study
#3
Jacopo Antonino Vitale, Eva Bjoerkesett, Andrea Campana, Giacomo Panizza, Andi Weydahl
BACKGROUND: An individual's chronotype influences his or her physiological rhythms. Some studies have looked at the effect of time of day on the responses to exercise, but studies on the effect of long-term training are lacking. OBJECTIVE:  To report the effects of an 8-week training period during the polar night in non-athletes of different chronotypes living at 70°N. DESIGN:  In all, 10 morning (M), 10 neither (N) and 10 evening (E) types were recruited, and their aerobic capacity (VO2max), strength, flexibility and balance before and after the training period were tested...
2017: International Journal of Circumpolar Health
https://www.readbyqxmd.com/read/28515831/the-relationship-of-living-environment-with-behavioral-and-fitness-outcomes-by-sex-an-exploratory-study-in-college-aged-students
#4
Kaelah Shaffer, Melissa Bopp, Zack Papalia, Dangaia Sims, Christopher M Bopp
Although physical activity (PA) is associated with several health benefits, there is a marked decline during college years, which is an influential period for the development of health behaviors. This study examined the relationship of neighborhood and living environment with behavioral (PA and sedentary behavior) and fitness outcomes by sex. Participants were college students that participated in a fitness assessment, followed by a survey that measured self-reported exercise and perception of one's environment (sidewalks, crime, traffic, access to PA resources in their neighborhood and/or apartment complex)...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28515830/how-different-respiratory-rate-patterns-affect-cardiorespiratory-variables-and-performance
#5
Minas Nalbandian, Zsolt Radak, Jun Taniguchi, Takeda Masaki
This study aims to elucidate how respiratory rate (RR) patterns may affect respiratory gas exchange variables and performance during incremental intensity- exercise. 10 healthy young men (mean ± SD, age: 20.7 ± 0.5 years, height: 174.3 ± 5.7 cm, and body mass: 72.6 ± 10.4 kg) performed three incremental tests on a cycle ergometer at three different RR (60, 45 and 30 breaths per min) in each trial. During the tests, tidal volume (TV), minute ventilation (VE), fractional content of oxygen (FeO2), fractional content of carbon dioxide (FeCO2), oxygen uptake (VO2), expiratory carbon dioxide (VCO2), equivalent of oxygen (EqO2), VE/VCO2, and respiratory exchange ratio (RER) were determinate breath-by-breath...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28514266/pulmonary-vascular-function-and-aerobic-exercise-capacityat-moderate-altitude
#6
Vitalie Faoro, Gael Deboeck, Marco Vicenzi, Anne-Fleur Gaston, Bamodi Simaga, Grégory Doucende, Ilona Hapkova, Emma Roca, Enric Subirats, Fabienne Durand, Robert Naeije
PURPOSE: There has been suggestion that a greater "pulmonary vascular reserve" defined by a low pulmonary vascular resistance (PVR) and a high lung diffusing capacity (DL) allows for a superior aerobic exercise capacity. How pulmonary vascular reserve might affect exercise capacity at moderate altitude is not known. METHODS: Thirty-eight healthy subjects underwent an exercise stress echocardiography of the pulmonary circulation, combined with measurements of DL for nitric oxide (NO) and carbon monoxide (CO) and a cardio-pulmonary exercise test at sea level and at the altitude of 2250m...
May 17, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28508559/two-weeks-of-repetitive-gut-challenge-reduces-exercise-associated-gastrointestinal-symptoms-and-malabsorption
#7
Atlanta Miall, Anthony Khoo, Christopher Rauch, Rhiannon Snipe, Vera Camões-Costa, Peter R Gibson, Ricardo J S Costa
Debilitating gastrointestinal symptoms are a common feature of endurance running, and may be exacerbated by and (or) limit the ability to tolerate carbohydrate intake during exercise. The study aimed to determine whether two weeks of repetitive gut-challenge during running can reduce exercise associated gastrointestinal symptoms and carbohydrate malabsorption. Endurance runners (n= 18) performed an initial gut-challenge trial (GC1) comprising 2 h running exercise at 60% VO2max (steady state) whilst consuming a formulated gel-disc containing 30 g carbohydrates (2:1 glucose-fructose, 10% w/v) every 20 min, followed by a 1 h running effort bout...
May 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28507521/prime-time-light-exposures-do-not-seem-to-improve-maximal-physical-performance-in-male-elite-athletes-but-enhance-end-spurt-performance
#8
Raphael Knaier, Juliane Schäfer, Anja Rossmeissl, Christopher Klenk, Henner Hanssen, Christoph Höchsmann, Christian Cajochen, Arno Schmidt-Trucksäss
Many sports competitions take place during television prime time, a time of the day when many athletes have already exceeded their time of peak performance. We assessed the effect of different light exposure modalities on physical performance and melatonin levels in athletes during prime time. Seventy-two young, male elite athletes with a median (interquartile range) age of 23 (21; 29) years and maximum oxygen uptake (VO2max) of 63 (58; 66) ml/kg/min were randomly assigned to three different light exposure groups: bright light (BRIGHT), blue monochromatic light (BLUE), and control light (CONTROL)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28502838/sleep-quality-and-duration-are-associated-with-performance-in-maximal-incremental-test
#9
B M Antunes, E Z Campos, S S Parmezzani, R V Santos, E Franchini, F S Lira
BACKGROUND AND OBJECTIVE: Inadequate sleep patterns may be considered a trigger to development of several metabolic diseases. Additionally, sleep deprivation and poor sleep quality can negatively impact performance in exercise training. However, the impact of sleep duration and sleep quality on performance during incremental maximal test performed by healthy men is unclear. Therefore, the purpose of the study was to analyze the association between sleep pattern (duration and quality) and performance during maximal incremental test in healthy male individuals...
May 11, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28501557/the-positive-cognitive-impact-of-aerobic-fitness-is-associated-with-peripheral-inflammatory-and-brain-derived-neurotrophic-biomarkers-in-young-adults
#10
Jungyun Hwang, Darla M Castelli, F Gonzalez-Lima
There is ample evidence for supporting the positive impact of aerobic fitness on cognitive function, but little is known about the physiological mechanisms. The objective of this study was to investigate whether the positive cognitive impact of aerobic fitness is associated with inflammatory and neurotrophic peripheral biomarkers in young adults aged 18 to 29years (n=87). For the objective assessment of aerobic fitness, we measured maximal oxygen uptake (VO2max) as a parametric measure of cardiorespiratory capacity...
May 10, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28493030/ambulatory-blood-pressure-response-to-a-bout-of-hiit-in-metabolic-syndrome-patients
#11
M Ramirez-Jimenez, F Morales-Palomo, J G Pallares, Ricardo Mora-Rodriguez, J F Ortega
PURPOSE: The effectiveness of exercise to lower blood pressure may depend on the type and intensity of exercise. We study the short-term (i.e., 14-h) effects of a bout of high-intensity aerobic interval training (HIIT) on blood pressure in metabolic syndrome (MetS) patients. METHODS: Nineteen MetS patients (55.2 ± 7.3 years, 6 women) entered the study. Eight of them were normotensive and eleven hypertensive according to MetS threshold (≥130 mmHg for SBP and/or ≥85 mmHg for DBP)...
May 10, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28488832/road-to-the-olympics-physical-fitness-of-medalists-of-the-canoe-sprint-junior-european-and-world-championship-events-over-the-past-20-years
#12
Viktor Bielik, Leonard Lendvorský, Lukáš Lengvarský, Peter Lopata, Róbert Petriska, Jana Pelikánová
BACKGROUND: In this article we aimed to find out whether there is a difference in physiological, anthropometric and power variables between medalists in junior international Championship events (MJCH) and the remaining members of the national team (NT) in flat water canoe sprint. METHODS: Sixty male junior kayakers from Slovak NT were tested annually between years 1995 and 2016. Sixteen of them won at least one medal (gold, silver or bronze) at junior international Championship...
May 9, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28486334/aerobic-exercise-supplemented-with-muscular-endurance-training-improves-onset-of-blood-lactate-accumulation
#13
John W Farrell, David J Lantis, Carl J Ade, Greg S Cantrell, Rebecca D Larson
Studies have shown that when aerobic exercise is supplemented with muscular endurance training metabolic adaptions occur that result in the delay of the onset of blood lactate accumulation (OBLA). However, previous studies have not explored any submaximal cardiorespiratory adaptations that may result from this training protocol. The aim of the current investigation was to evaluate the effect of supplementing an aerobic exercise training program with a muscular endurance training program on various cardiorespiratory and metabolic measurements...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486015/muscular-and-cardiorespiratory-fitness-in-homeschool-versus-public-school-children
#14
Laura S Kabiri, Katy Mitchell, Wayne Brewer, Alexis Ortiz
PURPOSE: The growth and unregulated structure of homeschooling creates an unknown population in regard to muscular and cardiorespiratory fitness. The purpose of this research was to compare muscular and cardiorespiratory fitness between elementary school aged homeschool and public school children. METHOD: Homeschool children ages 8-11 years old (n=75) completed the curl-up, 90° push-up, and Progressive Aerobic Capacity Endurance Run (PACER) portions of the FitnessGram® to assess abdominal and upper body strength and endurance as well as cardiorespiratory fitness...
May 9, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28483221/effect-of-the-external-nasal-dilator-on-adolescent-athleteswith-and-without-allergic-rhinitis
#15
Ricardo Reis Dinardi, Cláudia Ribeiro de Andrade, Cássio da Cunha Ibiapina
OBJECTIVES: The ability to effectively breathe through the nose is an important component of physical exercise. The goal of this study is to evaluate the effect of the external nasal dilator (END) on healthy adolescent athletes and those with allergic rhinitis. METHODS: Clinical trial, double-blind, crossover, in which we evaluated healthy adolescent athletes with allergic rhinitis, using experimental and placebo ENDs, submitted to a maximum cardio-respiratory test in randomized order...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28481376/recovery-of-rescuers-from-a-24-h-shift-and-its-association-with-aerobic-fitness
#16
Katariina Lyytikäinen, Leena Toivonen, Esa Hynynen, Harri Lindholm, Heikki Kyröläinen
OBJECTIVES: Rescuers work in 24-h shifts and the demanding nature of the occupation requires adequate recovery between work shifts. The purpose of this study has been to find out what kind of changes in autonomic control may be seen during work shift and its recovery period in the case of rescuers. An additional interest has been to see if aerobic fitness is associated with recovery from work shifts. MATERIAL AND METHODS: Fourteen male rescuers (aged 34±9 years old) volunteered to participate in the study...
May 8, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28479954/the-effect-of-high-intensity-interval-run-training-on-cross-sectional-area-of-the-vastus-lateralis-in-untrained-college-students
#17
Rebekah R Estes, Amy Malinowski, Meredith Piacentini, David Thrush, Eric Salley, Cassidy Losey, Erik Hayes
Aerobic cycling has been repeatedly shown to induce hypertrophy in skeletal muscle across a variety of populations, while there has been a lack of investigation into the impact of running upon hypertrophy. An increasingly popular model of aerobic exercise is high-intensity interval training (HIIT); in addition to its positive impact upon cardiovascular health, HIIT may be sufficient for inducing significant muscular hypertrophy. Therefore, the purpose of this investigation was to examine the influence of a high-intensity interval running protocol upon hypertrophy of the vastus lateralis in an untrained, young population...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28479953/effects-of-simulated-altitude-on-maximal-oxygen-uptake-and-inspiratory-fitness
#18
Nicole C Biggs, Benjamin S England, Nicole J Turcotte, Melissa R Cook, Alyne L Williams
Aerobic exercise at altitude has shown an increase in maximal oxygen uptake. Similar effects have been replicated by way of simulated altitude training, which have influenced various advances in the field of exercise science. Elevation Training Masks© (ETM) claim to stimulate cardiorespiratory fitness improvements similar to training at altitude, however, there is little research to support this claim. The purpose of this study was to research the effect that a hypoxia-inducing mask would have on cardiorespiratory fitness and pulmonary function through the use of a high intensity interval training (HIIT) running program...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28475548/warm-up-exercises-may-not-be-so-important-for-enhancing-submaximal-running-performance
#19
Kazuki Takizawa, Taichi Yamaguchi, Keisuke Shibata
The purpose of this study was to determine an appropriate warm-up intensity for enhancing performance in submaximal running at 90%vVO2max (it assumes 3000 m to 5000 m in track events). Seven trained male university athletes took part in this study (age: 21.3 ± 2.1 years, height: 169.3 ± 4.7 cm, weight: 58.4 ± 5.6 kg, VO2max: 73.33 ± 5.46 ml/kg/min). Each subject ran on a treadmill at 90%vVO2max until exhaustion after one of four warm-up treatments. The four warm-up treatments were no warm-up, 15 min running at 60%vVO2max, at 70%vVO2max and at 80%vVO2max...
April 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28469761/lower-leg-length-is-associated-with-running-economy-in-high-level-caucasian-distance-runners
#20
Rauno Laumets, Karel Viigipuu, Kerli Mooses, Jarek Mäestu, Priit Purge, Ando Pehme, Priit Kaasik, Martin Mooses
The aim of the present study was to investigate lower limb anthropometric and composition variables related to running economy (RE) and running performance in a homogeneous group of high level European distance runners. RE at the speeds of 14, 16 and 18 km·h(-1) (189 ± 12; 188 ± 11; 187 ± 11 O2 ml·kg(-1)·km(-1)) and maximal oxygen uptake (VO2max) (67.3 ± 2.9 ml·kg(-1)·min(-1)) of 13 high level distance runners were determined on a motorised treadmill. Anthropometric variables and body composition were measured...
February 2017: Journal of Human Kinetics
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