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https://www.readbyqxmd.com/read/27901338/determinant-factors-of-peak-treadmill-speed-in-physically-active-men
#1
Leonardo Alves Pasqua, Mayara V Damasceno, Salomão Bueno, Alessandro M Zagatto, Gustavo G DE Araújo, Adriano E Lima-Silva, Rômulo Bertuzzi
BACKGROUND: The aim of the present study was to determine whether physiological factors and maximal dynamic strength are able to determine the peak treadmill speed (PTS) in physically active individuals. METHODS: One hundred and fifty physically active healthy males voluntarily visit the laboratory on three separate occasions and underwent the following activities: first visit: IPAQ (short version), anthropometric measurements, and a maximal incremental test performed for physiological variables (maximal oxygen uptake ( ) and respiratory compensation point (RCP); second visit: constant speed test for running economy (RE) measurement, and familiarization with the maximum dynamic strength (1RM) test in the leg press exercise; third visit: 1RM test...
November 30, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27895900/nutritional-implications-for-ultra-endurance-walking-and-running-events
#2
REVIEW
Eric Williamson
This paper examines the various nutritional challenges which athletes encounter in preparing for and participating in ultra-endurance walking and running events. Special attention is paid to energy level, performance, and recovery within the context of athletes' intake of carbohydrate, protein, fat, and various vitamins and minerals. It outlines, by way of a review of literature, those factors which promote optimal performance for the ultra-endurance athlete and provides recommendations from multiple researchers concerned with the nutrition and performance of ultra-endurance athletes...
2016: Extreme Physiology & Medicine
https://www.readbyqxmd.com/read/27882292/muscular-strength-and-endurance-and-cardio-metabolic-health-in-disadvantaged-hispanic-children-from-the-u-s
#3
Ryan D Burns, Timothy A Brusseau
The predictive relationship between muscular strength and endurance and cardio-metabolic health, independent from aerobic fitness, is not clear in disadvantaged Hispanic children. The purpose of this study was to examine the predictive relationship between muscular strength and endurance and clustered cardio-metabolic risk, controlling for aerobic fitness, in Hispanic children from low-income schools. Participants were 320 Hispanic children (Mean age = 10.1 ± 1.1 years; 164 girls, 156 boys) recruited during the 2014-2015 and 2015-2016 academic years from five low-income schools from the state of Utah in the U...
March 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/27879166/sex-differences-in-release-of-cardiac-troponin-t-after-endurance-exercise
#4
Zhaowei Kong, Jinlei Nie, Hua Lin, Keith George, Gang Zhao, Haifeng Zhang, Tomas K Tong, Qingde Shi
CONTEXT: Post-exercise cardiac troponin release has been extensively described in athletic groups but little attention has been given to any role of sex in mediating this phenomnenon. OBJECTIVE: We compared the release of cardiac troponin T (cTnT) after endurance running in training-experience, biological-age and maturity-matched young male and female runners. MATERIALS AND METHODS: Nineteen male (training history: 2.3±1.0 yr; mean age: 16...
November 23, 2016: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/27873387/physical-exercise-remodels-visceral-adipose-tissue-and-mitochondrial-lipid-metabolism-in-rats-fed-a-high-fat-diet
#5
Sílvia Rocha-Rodrigues, Amaia Rodríguez, Sara Becerril, Beatriz Ramírez, I O Gonçalves, Jorge Beleza, Gema Frühbeck, António Ascensão, José Magalhães
We aimed to investigate the effects of two physical exercise models, voluntary physical activity (VPA) and endurance training (ET) as preventive and therapeutic strategies, respectively, on lipid accumulation regulators and mitochondrial content in VAT of rats fed a high-fat diet (HFD). Sprague Dawley rats (6 wks old, n=60) were assigned into sedentary and VPA groups fed isoenergetic diets: standard (S, 35 kcal% fat) or HFD (71 kcal% fat). The VPA groups had free access to wheel running during the entire protocol...
November 22, 2016: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/27863188/the-use-of-2-conditioning-programs-and-the-fitness-characteristics-of-police-academy-cadets
#6
Charles Cocke, Jay Dawes, Robin Marc Orr
CONTEXT:  Police academy training must physically prepare cadets for the rigors of their occupational tasks to prevent injury and allow them to adequately perform their duties. OBJECTIVE:  To compare the effects of 2 physical training programs on multiple fitness measures in police cadets. DESIGN:  Cohort study. SETTING:  Police training academy. PATIENTS OR OTHER PARTICIPANTS:  We collected data from 70 male (age = 27...
November 18, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27856713/effect-of-increased-and-maintained-frequency-of-speed-endurance-training-on-performance-and-muscle-adaptations-in-runners
#7
Casper Skovgaard, Nicki Winfield Almquist, Jens Bangsbo
The aim of the study was, in runners accustomed to speed endurance training (SET), to examine the effect of increased and maintained frequency of SET on performance and muscular adaptations. After familiarization (FAM) to SET, eighteen male (n=14) and female (n=4) runners (VO2-max: 57.3±3.4 ml·min(-1); mean±SD) completed twenty sessions of maintained low-frequency (LF; every fourth day; n=7) or high-frequency (HF; every second day; n=11) SET (intervention period; INT). Before FAM as well as before and after INT, subjects completed a series of running tests and a biopsy from m...
November 17, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27843418/effects-of-acute-carbohydrate-ingestion-on-anaerobic-exercise-performance
#8
Ben M Krings, Jaden A Rountree, Matthew J McAllister, Patrick M Cummings, Timothy J Peterson, Brent J Fountain, JohnEric W Smith
BACKGROUND: Carbohydrate (CHO) supplementation during endurance exercises has been shown to increase performance, but there is limited research with CHO supplementation during strength and conditioning exercises. Therefore, the purpose of this study was to examine the effects of various levels of CHO ingestion during acute testing sessions requiring participants to complete a strength and conditioning program designed for collegiate athletes. METHODS: Participants (n = 7) performed a series of exercises while ingesting an amino-acid electrolyte control (CON) or CON plus varying levels of CHO...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27824688/gross-motor-skills-and-cardiometabolic-risk-in-children-a-mediation-analysis
#9
Ryan D Burns, Timothy A Brusseau, You Fu, James C Hannon
PURPOSE: The purpose of this study was to examine the linear relationship between gross motor skills and cardiometabolic risk, with aerobic fitness as a mediator variable, in low-income children from the U.S. METHODS: Participants were a convenience sample of 224 children (Mean age = 9.1 ± 1.1 years; 129 girls, 95 boys) recruited from five low-income elementary schools from the Mountain West Region of the U.S. Gross motor skills were assessed using the Test for Gross Motor Development 3rd Edition...
November 7, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27813393/the-effect-of-a-short-term-training-period-on-physiological-parameters-and-running-performance-intensity-distribution-versus-constant-intensity-exercise
#10
Vicente J Clemente-Suárez, Athanasios A Dalamitros, Pantelis T Nikolaidis
BACKGROUND: This study compared the effect of two training strategies differing on the weekly intensity distribution on physiological parameters and running performance in moderately trained endurance athletes. METHODS: Thirty male athletes were equally divided into three groups, one following an increasing weekly aerobic intensity distribution (EXP1), one with constant weekly aerobic intensitydistribution (EXP2) and a control one, following a freely chosen program (CON)...
November 4, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27811379/improving-actuation-efficiency-through-variable-recruitment-hydraulic-mckibben-muscles-modeling-orderly-recruitment-control-and-experiments
#11
Michael Meller, Jordan Chipka, Alexander Volkov, Matthew Bryant, Ephrahim Garcia
Hydraulic control systems have become increasingly popular as the means of actuation for human-scale legged robots and assistive devices. One of the biggest limitations to these systems is their run time untethered from a power source. One way to increase endurance is by improving actuation efficiency. We investigate reducing servovalve throttling losses by using a selective recruitment artificial muscle bundle comprised of three motor units. Each motor unit is made up of a pair of hydraulic McKibben muscles connected to one servovalve...
November 3, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27810940/fitness-tests-and-occupational-tasks-of-military-interest-a-systematic-review-of-correlations
#12
REVIEW
Veronique D Hauschild, David W DeGroot, Shane M Hall, Tyson L Grier, Karen D Deaver, Keith G Hauret, Bruce H Jones
: Physically demanding occupations (ie, military, firefighter, law enforcement) often use fitness tests for job selection or retention. Despite numerous individual studies, the relationship of these tests to job performance is not always clear. : This review examined the relationship by aggregating previously reported correlations between different fitness tests and common occupational tasks. : Search criteria were applied to PUBMED, EBSCO, EMBASE and military sources; scoring yielded 27 original studies providing 533 Pearson correlation coefficients (r) between fitness tests and 12 common physical job task categories...
November 3, 2016: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27799464/muscle-injury-and-impaired-function-and-insulin-resistance-in-chromogranin-a-knockout-mice
#13
Kechun Tang, Teresa Pasqua, Angshuman Biswas, Sumana Mahata, Jennifer Tang, Alisa Tang, Gautam K Bandyopadhyay, Amiya Sinha-Hikim, Nai-Wen Chi, Nick Webster, Angelo Corti, Sushil K Mahata
Chromogranin A (CgA) is widely expressed in endocrine and neuroendocrine tissues as well as in the central nervous system. We observed CgA expression (mRNA and protein) in the gastrocnemius (GAS) muscle and found that performance of CgA-deficient Chga-KO mice in treadmill exercise was impaired. Supplementation with CgA in Chga-KO mice restored exercise ability suggesting a novel role for endogenous CgA in skeletal muscle function. Chga-KO mice display (i) lack of exercise-induced stimulation of pAKT, pTBC1D1 and phospho-p38 kinase signaling, (ii) loss of GAS muscle mass, (iii) extensive formation of tubular aggregates (TA), (iv) disorganized cristae architecture in mitochondria, (v) increased expression of the inflammatory cytokines Tnfα, Il6 and Ifnɣ, and fibrosis...
October 31, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27798356/lack-of-replication-of-associations-between-multiple-genetic-polymorphisms-and-endurance-athlete-status-in-japanese-population
#14
Thomas Yvert, Eri Miyamoto-Mikami, Haruka Murakami, Motohiko Miyachi, Takashi Kawahara, Noriyuki Fuku
The aim of this study was to examine a polygenic profile related to endurance performance, based on current knowledge, in the Japanese population. We analyzed 21 genetic polymorphisms that have been reported to be associated with endurance performance and its related phenotypes in 175 endurance runners (60 international-, 94 national-, and 21 regional-level) and 649 controls in the Japanese population. Then, we calculated the total genotype score (TGS) (maximum value of 100 for the theoretically optimum polygenic score) for endurance performance...
October 2016: Physiological Reports
https://www.readbyqxmd.com/read/27794435/dietary-nitrate-markedly-improves-voluntary-running-in-mice
#15
Niklas Ivarsson, Tomas A Schiffer, Andrés Hernández, Johanna T Lanner, Eddie Weitzberg, Jon O Lundberg, Håkan Westerblad
Nitrate supplementation is shown to increase submaximal force in human and mouse skeletal muscles. In this study, we test the hypothesis that the increased submaximal force induced by nitrate supplementation reduces the effort of submaximal voluntary running, resulting in increased running speed and distance. C57Bl/6N male mice were fed nitrate in the drinking water and housed with or without access to an in-cage running wheel. Nitrate supplementation in sedentary mice had no effect on endurance in a treadmill test, nor did it enhance mitochondrial function...
October 26, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27787334/temperate-performance-benefits-after-heat-but-not-combined-heat-and-hypoxic-training
#16
Erin L McCleave, Katie M Slattery, Rob Duffield, Philo U Saunders, Avish P Sharma, Stephen J Crowcroft, Aaron J Coutts
INTRODUCTION: Independent heat and hypoxic exposure can enhance temperate endurance performance in trained athletes, although their combined effects remain unknown. This study examined whether the addition of heat interval training during 'Live High, Train Low' (LHTL) hypoxic exposure would result in enhanced performance and physiological adaptations as compared to heat or temperate training. METHODS: Twenty-six well-trained runners completed three weeks of interval training assigned to one of three conditions: 1) LHTL hypoxic exposure plus heat training (H+H; 3000 m for 13 h·day, train at 33°C, 60% RH), 2) heat training with no hypoxic exposure (HOT, live at <600m and train at 33°C, 60% RH), or 3) temperate training with no hypoxic exposure (CONT; live at <600m and train at 14°C, 55% RH)...
October 27, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27784675/exercise-induced-alterations-and-loss-of-sarcomeric-m-line-organization-in-the-diaphragm-muscle-of-obscurin-knockout-mice
#17
Davide Randazzo, Bert Blaauw, Cecilia Paolini, Enrico Pierantozzi, Simone Spinozzi, Stephan Lange, Ju Chen, Feliciano Protasi, Carlo Reggiani, Vincenzo Sorrentino
We recently reported that skeletal muscle fibers of obscurin knockout (KO) mice present altered distribution of ankB, disorganization of the sub-sarcolemmal microtubules and reduced localization of dystrophin at costameres. In addition, these mice have impaired running endurance and increased exercise-induced sarcolemmal damage compared to wild-type animals. Here, we report results from a combined approach of physiological, morphological, and structural studies in which we further characterize the skeletal muscles of obscurin KO mice...
October 26, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27783805/effects-of-endurance-training-on-reduction-of-plasma-glucose-during-high-intensity-constant-and-incremental-speed-tests-in-wistar-rats
#18
P Abreu, K F Vitzel, I C C R Monteiro, T I Lima, A N Queiroz, J H Leal-Cardoso, S M Hirabara, V M Ceccatto
The aim of this research was to investigate the effects of endurance training on reduction of plasma glucose during high intensity constant and incremental speed tests in Wistar rats. We hypothesized that plasma glucose might be decreased in the exercised group during heavy (more intense) exercise. Twenty-four 10-week-old male Wistar rats were randomly assigned to sedentary and exercised groups. The prescription of endurance exercise training intensity was determined as 60% of the maximum intensity reached at the incremental speed test...
October 24, 2016: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/27780284/effect-of-continuous-and-intermittent-exercises-on-oxidised-hdl-and-ldl-lipids-in-runners
#19
I A Välimäki, T Vuorimaa, M Ahotupa, T Vasankari
We studied the effects of different types of exercises on the concentrations of oxidised HDL (oxHDLlipids) and LDL lipids (oxLDLlipids), serum lipids, antioxidant potential, paraoxonase and malondialdehyde in endurance runners by performing both a 40-min continuous run (velocity corresponding to 80% VO2max) and a 40-min intermittent run (2-min run, velocity corresponding to 100% VO2max, and 2-min rest) using a treadmill. Blood samples were taken before exercise, after 20 and 40 min of exercise, and 15 and 90 min after the end of exercise...
October 25, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27776250/atrial-fibrillation-in-highly-trained-endurance-athletes-description-of-a-syndrome
#20
Fabian Sanchis-Gomar, Carme Perez-Quilis, Giuseppe Lippi, Gianfranco Cervellin, Roman Leischik, Herbert Löllgen, Enrique Serrano-Ostáriz, Alejandro Lucia
Atrial fibrillation (AF) is the most common heart arrhythmia, the risk of which typically increases with age. This condition is commonly associated with major cardiovascular diseases and structural heart damage, while it is rarely observed in healthy young people. However, increasing evidence indicates that paroxysmal AF can also onset in young or middle-aged and otherwise healthy endurance athletes (e.g., cyclists, runners and cross-country skiers). Here we review the topic of AF associated with strenuous endurance exercise (SEE), for example cycling, running and cross-country skiing, especially at a competitive level, and we propose the definition of a new syndrome based on the accumulating data in the literature: SEE-related AF under the acronym of 'PAFIYAMA' ('paroxysmal AF in young and middle-aged athletes')...
October 19, 2016: International Journal of Cardiology
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