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https://www.readbyqxmd.com/read/28731978/differences-in-spatiotemporal-parameters-between-trained-runners-and-untrained-participants
#1
Josué Gómez-Molina, Ana Ogueta-Alday, Christopher Stickley, Jesús Cámara, Jon Cabrejas-Ugartondo, Juan García-López
Gómez-Molina, J, Ogueta-Alday, A, Stickley, C, Tobalina, JC, Cabrejas-Ugartondo, J, and García-López, J. Differences in spatiotemporal parameters between trained runners and untrained participants. J Strength Cond Res 31(8): 2169-2175, 2017-The aim of this study was to compare the spatiotemporal parameters of trained runners and untrained participants with the same foot strike pattern (rearfoot) during running at controlled speeds. Twenty-one participants were classified in 2 groups according to their training experience: Trained (n = 10, amateur runners with long distance training experience) and Untrained (n = 11, healthy untrained participants)...
August 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28719492/fifty-men-3510-marathons-cardiac-risk-factors-and-coronary-artery-calcium-scores
#2
William O Roberts, Robert S Schwartz, Ross F Garberich, Samantha Carlson, Thomas Knickelbine, Jonathan G Schwartz, Gretchen Peichel, John R Lesser, Kelly Wickstrom, Kevin M Harris
INTRODUCTION/PURPOSE: Many male marathon runners have elevated coronary artery calcium (CAC) scores despite high physical activity. We examined the association between CAC scores, cardiovascular risk factors, and lifestyle habits in long term marathoners. METHODS: We recruited men who had run ≥1 marathon annually for 25 consecutive years. CAC was assessed using coronary computed tomography angiography. Atherosclerotic cardiovascular disease (CAD) risk factors were measured with a 12-lead ECG, serum lipid panel, height, weight, resting blood pressure and heart rate, and a risk factor questionnaire...
July 17, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28713466/intra-subject-variability-of-5-km-time-trial-performance-completed-by-competitive-trained-runners
#3
James Fisher, Thomas Clark, Katherine Newman-Judd, Josh Arnold, James Steele
Time-trials represent an ecologically valid approach to assessment of endurance performance. Such information is useful in the application of testing protocols and estimation of sample sizes required for research/magnitude based inference methods. The present study aimed to investigate the intra-subject variability of 5 km time-trial running performance in trained runners. Six competitive trained male runners (age = 33.8 ± 10.1 years; stature = 1.78 ± 0.01 m; body mass = 69.0 ± 10.4 kg, [Formula: see text]O2max = 62...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28712261/application-of-living-high-training-low-enhances-cardiac-function-and-skeletal-muscle-oxygenation-during-submaximal-exercises-in-athletes
#4
Hun-Young Park, Sang-Seok Nam
PURPOSE: The aim of this study was to determine the efficiency of the application of living high-training low (LHTL) on cardiac function and skeletal muscle oxygenation during submaximal exercises compared with that of living low-training low (LLTL) in athletes. METHODS: Male middle- and long-distance runners (n = 20) were randomly assigned into the LLTL group (n = 10, living at 1000-m altitude and training at 700-1330-m altitude) and the LHTL group (n = 10, living at simulated 3000-m altitude and training at 700-1330-m altitude)...
March 31, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28704885/submaximal-markers-of-fatigue-and-overreaching-implications-for-monitoring-athletes
#5
André Siegl, Elisa M Kösel, Nicholas Tam, Susanne Koschnick, Nelleke G Langerak, Sabrina Skorski, Tim Meyer, Robert P Lamberts
The regular monitoring of athletes is important to fine-tune training and detect early symptoms of overreaching. Therefore the aim of this study was to determine if a noninvasive submaximal running test could reflect a state of overreaching. 14 trained runners completed a noninvasive Lamberts Submaximal Running Test, one week before and 2 days after finishing an ultramarathon, and delayed onset of muscle soreness and the daily analysis of life demands for athletes questionnaire were also captured. After the ultramarathon, submaximal heart rate was lower at 70% (-3 beats) and 85% of peak treadmill running speed (P<0...
July 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28682935/muscle-activity-and-physiological-responses-during-running-in-water-and-on-dry-land-at-submaximal-and-maximal-efforts
#6
Kenji Masumoto, Kyle C Mefferd, Riley Iyo, John A Mercer
We investigated muscle activity, oxygen uptake, heart rate, and rating of perceived exertion during running in water and on dry land at submaximal and maximal efforts. Eleven recreational runners performed deep water running (DWR) and treadmill running (TMR) graded exercise tests on separate days. On the third test day, the participants exercised at their 60%, 80%, and 100% of maximal oxygen uptake (VO2max) by matching specific stride frequencies or running speeds. VO2max, maximal heart rate (HRmax), and rating of perceived exertion at maximal effort (RPEmax) were measured...
July 3, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28659740/biochemical-physiological-and-performance-response-of-a-functional-watermelon-juice-enriched-in-l-citrulline-during-a-half-marathon-race
#7
Ascensión Martínez-Sánchez, Domingo J Ramos-Campo, Bárbara Fernández-Lobato, Jacobo A Rubio-Arias, Fernando Alacid, Encarna Aguayo
Background: Watermelon is a rich natural source of l-citrulline. This non-essential amino acid increases exercise performance. Objective: Evaluate the effect of Fashion watermelon juice enriched in l-citrulline (CWJ) (3.45 g per 500 mL) in physical performance and biochemical markers after a half-marathon race. Design: A randomised, double blind, crossover design where 2 h after drinking 500 mL of CWJ or placebo (PLA, beverage without l-citrulline) amateur male runners performed two half-marathon races...
2017: Food & Nutrition Research
https://www.readbyqxmd.com/read/28543790/are-heart-rate-monitors-valuable-tools-for-diagnosing-arrhythmias-in-endurance-athletes
#8
R Gajda, E K Biernacka, W Drygas
Millions of physically active individuals worldwide use heart rate monitors (HRMs) to control their exercise intensity. In many cases, the HRM indicates an unusually high heart rate (HR) or even arrhythmias during training. Unfortunately, studies assessing the reliability of these devices to help control HR disturbances during exercise do not exist. We examined 142 regularly training endurance runners and cyclists, aged 18-51 years, with unexplained HR abnormalities indicated by various HRMs to assess the utility of HRMs in diagnosing exertion-induced arrhythmias...
May 19, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28542090/5-km-time-trial-reliability-of-a-non-motorized-treadmill-and-comparison-of-physiological-and-perceptual-responses-versus-a-motorized-treadmill
#9
Hunter S Waldman, Alex J Heatherly, Ashton F Waddell, Ben M Krings, Eric K O'Neal
This study examined the reproducibility of performance across 3 non-motorized treadmill (NMT) 5-km time trials (TT) and physiological, gait, and perceptual differences of running at 5-km pace for both NMT and motorized treadmills (MT). Ten male runners experienced in road racing that had never run on a NMT completed 3 TT to establish personal best 5-km pace. In a later session, participants ran at this pace for 5 min on the NMT while metabolic, gait, and perceptual measures were recorded and then ran at outdoor 5-km personal best pace on a MT at 1% grade (counter-balanced crossover design)...
May 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28535286/invited-commentary-is-strenuous-activity-good-for-you-the-legacy-of-ralph-paffenbarger
#10
Lewis H Kuller
Ralph Paffenbarger, Jr, MD, DrPH (1922-2007), was initially trained as an infectious disease epidemiologist at the Johns Hopkins School of Hygiene and Public Health (now the Bloomberg School of Public Health). He was the first Epidemiology Intelligence Service officer in the first Epidemiology Intelligence Service class. He joined the National Heart Institute (now the National Heart, Lung, and Blood Institute) in its very early days and later became a faculty member at Stanford University and Harvard University...
June 1, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28479950/the-effects-of-a-10-day-altitude-training-camp-at-1828-meters-on-varsity-cross-country-runners
#11
Sebastian R Diebel, Ian Newhouse, David S Thompson, Vineet B K Johnson
Altitude training has been shown to alter blood lactate (BL) levels due to alterations resulting from acclimatization. This study aims to estimate the impact of altitude training on BL changes immediately following an incremental treadmill test and during recovery before and after 10-day altitude training at approximately 1828 meters. Eight varsity cross-country runners performed an incremental treadmill test (ITT), pre and post-altitude training. Resting and post-warm-up BL values were recorded. During ITT, heart rate (HR), oxygen saturation (SpO2), and time to exhaustion were monitored...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28447185/maximum-rate-of-sweat-ions-reabsorption-during-exercise-with-regional-differences-sex-and-exercise-training
#12
Tatsuro Amano, Megumi Hirose, Kana Konishi, Nicola Gerrett, Hiroyuki Ueda, Narihiko Kondo, Yoshimitsu Inoue
PURPOSE: It is recently reported that determining sweat rate (SR) threshold for increasing galvanic skin conductance (GSC) would represent a maximum rate of sweat ion reabsorption in sweat glands. We evaluate the maximum rate of sweat ion reabsorption over skin regions, sex, and long-term exercise training by using the threshold analysis in the present study. METHODS: Ten males (2 untrained, 4 sprinters, and 4 distance runners) and 12 females (5 untrained, 4 sprinters, and 3 distance runners) conducted graded cycling exercise for 45 min at low, middle, and high exercise intensities (heart rate 100-110, 120-130, and 140-150 beats/min, respectively) for 10, 15, and 20 min, respectively, at 30 °C and 50% relative humidity...
April 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28424267/using-a-novel-data-resource-to-explore-heart-rate-during-mountain-and-road-running
#13
Andrew Best, Barry Braun
Online, accessible performance and heart rate data from running competitions are posted publicly or semi-publicly to social media. We tested the efficacy of one such data resource- Strava- as a tool in exercise physiology investigations by exploring heart rate differences in mountain racing and road racing running events. Heart rate and GPS pace data were gathered from Strava activities posted by 111 males aged 21-49, from two mountain races (Mt. Washington Road Race and Pike's Peak Ascent) and two road race distances (half marathon and marathon)...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28367686/biomechanical-metabolic-and-cardiopulmonary-responses-of-masters-recreational-runners-during-running-at-different-speeds
#14
Hallie Hahn, Kevin R Vincent, Daniel C Herman, Cong Chen, Laura Ann Zdziarski, Christine Morgan, Heather K Vincent
This study tested interactions between age and running speed on biomechanics, metabolic responses and cardiopulmonary responses. Three-hundred participants ran at preferred and standardized speeds. Age group (younger, masters [≥40 years]) by speed (self-selected 8.8 km/h, 11.2 km/h and 13.6 km/h) interactions were tested on main outcomes of sagittal kinematic, temporal spatial, metabolic and cardiopulmonary parameters. At all speeds, angular displacements of the ankle, pelvis and knee were less in masters than younger runners (Hedges g effect size range = 0...
April 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28346316/impact-of-direction-of-unloading-influence-on-template-rate-of-perceived-exertion
#15
Beau Kjerulf Greer, Patrick R Young, Brooke Thompson, Brendan J Rickert, Matthew F Moran
It is suggested that exercisers engage in a process of teleoanticipation and create an exercise template based upon previous experience with the exercise task which guides their perceptions of the amount of effort required for task completion. The present study examined how altering workload intensity during a positive-pressure treadmill task may impact ratings of perceived exertion (RPE). In a counter-balanced design, 15 collegiate cross country runners (7 males, 8 females) performed two 25-min runs at a constant velocity while bodyweight (BW) was either increased from 60% to 100% (INC) or decreased from 100% to 60% (DEC) in 5 min increments...
March 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28257352/cardiovascular-risks-in-long-distance-runners
#16
REVIEW
Bethany Rolfe Witham, Keven Babbitt
Distance running has become increasingly popular since the 1970s. Despite the health benefits, long-distance running has been associated with an increased risk for cardiac events. Healthcare professionals should be familiar with distance running cardiac risk factors and preparticipation screening recommendations from the American Heart Association, and should screen and educate patients during healthcare encounters. Nurses are particularly well suited to educate runners on risks and symptoms of cardiac dysfunction...
April 2017: Journal of Christian Nursing: a Quarterly Publication of Nurses Christian Fellowship
https://www.readbyqxmd.com/read/28229577/maximal-aerobic-capacity-can-be-increased-by-enhancing-performers-expectancies
#17
Jeff Montes, Gabriele Wulf, James W Navalta
BACKGROUND: Maximum aerobic capacity (VO2max) is widely accepted as the best measure of cardiovascular fitness and aerobic power. The present study investigated whether enhancing participants' performance expectancies through positive social-comparative feedback would increase VO2max. METHODS: Participants were experienced runners who regularly ran for exercise or competitively. All participants completed two VO2max tests within a 2-week period at similar times of the day...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28177719/impact-of-polyphenols-on-physiological-stress-and-cardiac-burden-in-marathon-runners-results-from-a-substudy-of-the-bemagic-study
#18
Sebastian Clauss, Johannes Scherr, Alan Hanley, Jens Schneider, Ina Klier, Korbinian Lackermair, Eva Hoster, Michael Vogeser, David C Nieman, Martin Halle, Thomas Nickel
Both physiologic stress and chronic heart disease are associated with increased systemic levels of chromogranin A (CGA) and NT-proBNP. Marathon running causes physiological stress and imposes a significant cardiac burden. Polyphenol-rich Mediterranean and Asian diets have been demonstrated to exert beneficial effects on the cardiovascular system. In this study we investigated whether pretreatment with a polyphenol beverage could attenuate the physiological and cardiac stress associated with a marathon. In the BeMaGIC trial, 277 athletes were randomized into 2 groups in a double-blinded fashion, receiving 1-1...
May 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28150476/nitrate-containing-beetroot-juice-reduces-oxygen-consumption-during-submaximal-exercise-in-low-but-not-high-aerobically-fit-male-runners
#19
Colin R Carriker, Roger A Vaughan, Trisha A VanDusseldorp, Kelly E Johnson, Nicholas M Beltz, James J McCormick, Nathan H Cole, Ann L Gibson
Purpose: to examine the effect of a 4-day NO3- loading protocol on the submaximal oxygen cost of both low fit and high fit participants at five different exercise intensities. Methods: participants were initially assigned to a placebo (PL; negligible NO3-) or inorganic nitrate-rich (NR; 6.2 mmol nitrate/day) group; double-blind, placebo-controlled, crossover. Participants completed three trials (T1, T2 and T3). T1 included a maximal aerobic capacity (VO2max) treadmill test...
December 31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28149347/application-of-a-physiological-strain-index-in-evaluating-responses-to-exercise-stress-a-comparison-between-endurance-and-high-intensity-intermittent-trained-athletes
#20
Ilona Pokora, Aleksandra Żebrowska
The study evaluated differences in response to exercise stress between endurance and high-intensity intermittent trained athletes in a thermoneutral environment using a physiological strain index (PSI). Thirty-two subjects participated in a running exercise under normal (23°C, 50% RH) conditions. The group included nine endurance trained athletes (middle-distance runners - MD), twelve high-intensity intermittent trained athletes (soccer players - HIIT) and eleven students who constituted a control group. The exercise started at a speed of 4 km·h(-1) which was increased every 3 min by 2 km·h(-1) to volitional exhaustion...
April 1, 2016: Journal of Human Kinetics
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