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https://www.readbyqxmd.com/read/27903541/lifelong-physical-activity-regardless-of-dose-is-not-associated-with-myocardial-fibrosis
#1
Shuaib M Abdullah, Kyler W Barkley, Paul S Bhella, Jeffrey L Hastings, Susan Matulevicius, Naoki Fujimoto, Shigeki Shibata, Graeme Carrick-Ranson, M Dean Palmer, Nainesh Gandhi, Laura F DeFina, Benjamin D Levine
BACKGROUND: Recent reports have suggested that long-term, intensive physical training may be associated with adverse cardiovascular effects, including the development of myocardial fibrosis. However, the dose-response association of different levels of lifelong physical activity on myocardial fibrosis has not been evaluated. METHODS AND RESULTS: Seniors free of major chronic illnesses were recruited from predefined populations based on the consistent documentation of stable physical activity over >25 years and were classified into 4 groups by the number of sessions/week of aerobic activities ≥30 minutes: sedentary (group 1), <2 sessions; casual (group 2), 2 to 3 sessions; committed (group 3), 4 to 5 sessions; and Masters athletes (group 4), 6 to 7 sessions plus regular competitions...
November 2016: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27877137/an-extreme-mountain-ultra-marathon-decreases-the-cost-of-uphill-walking-and-running
#2
Gianluca Vernillo, Aldo Savoldelli, Spyros Skafidas, Andrea Zignoli, Antonio La Torre, Barbara Pellegrini, Guido Giardini, Pietro Trabucchi, Grégoire P Millet, Federico Schena
Purpose: To examine the effects of the world's most challenging mountain ultramarathon (MUM, 330 km, cumulative elevation gain of +24,000 m) on the energy cost and kinematics of different uphill gaits. Methods: Before (PRE) and immediately after (POST) the competition, 19 male athletes performed three submaximal 5-min treadmill exercise trials in a randomized order: walking at 5 km·h(-1), +20%; running at 6 km·h(-1), +15%; and running at 8 km·h(-1), +10%. During the three trials, energy cost was assessed using an indirect calorimetry system and spatiotemporal gait parameters were acquired with a floor-level high-density photoelectric cells system...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27806014/a-performance-analysis-of-a-stand-up-paddle-board-marathon-race
#3
AProf Ben Schram, Prof Wayne Hing, AProf Mike Climstein, AProf James Furness
Stand up paddle boarding (SUP) is a rapidly growing sport and recreational activity in which little scientific research exists. A review of the literature failed to identify a single article pertaining to the physiological demands of SUP competition. The purpose of this study was to conduct a performance analysis of a national level SUP marathon race. Ten elite SUP athletes (6 male, 4 female) were recruited from the Stand Up Paddle Surfing Association of Australia to have their race performance in the Australian Titles analyzed...
October 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27787469/running-performance-nationality-sex-and-age-in-10km-half-marathon-marathon-and-100km-ultra-marathon-iaaf-1999-2015
#4
Pantelis T Nikolaidis, Vincent O Onywera, Beat Knechtle
The aim of the present study was to examine the performance of the world's best runners in 10km, half-marathon, marathon and 100km by age, sex and nationality during 1999-2015 using data from International Association of Athletics Federations (IAAF). A total of 38,895 runners (17,136 women and 21,759 men) were considered with 2,594 (1,360 women and 1,234 male) in 10km, 11,595 (5,225 women and 6,370 male) in half-marathon, 23,973 (10,208 women and 13,765 male) in marathon and 733 (343 women and 390 male) in 100km...
October 13, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27761243/common-electrocardiogram-variations-pre-and-post-marathon
#5
John P Martin-Beaulieu, Karen M Myrick, Thomas Martin, Rachel W Pata, Richard S Feinn
Electrocardiographic changes can be present in marathon runners. These findings may be misinterpreted as malignant by healthcare providers. For example, incomplete right bundle branch block, early ventricular repolarization, and left ventricular hypertrophy by voltage criteria alone are quite common in athletes, yet considered benign.
October 2016: Clinical Case Reports
https://www.readbyqxmd.com/read/27753739/rutoside-and-hydrolytic-enzymes-do-not-attenuate-marathon-induced-inflammation
#6
Viola Grabs, Anna Kersten, Bernhard Haller, Siegmund Braun, David C Nieman, Martin Halle, Johannes Scherr
INTRODUCTION: Vigorous and prolonged exercise such as marathon running increases inflammatory markers and the risk of upper respiratory illness (URI) in athletes. Nutritional supplements are being tested as countermeasures of exercise-induced inflammation and immune dysfunction. METHODS: In this prospective randomized, double-blind, placebo-controlled Phase I trial, healthy male runners (N = 138, age 42 ± 11 y) were supplemented with rutoside (600-1200 mg/day) and hydrolytic enzymes (540-1,080 mg/day bromelain, 288-576 mg/day trypsin) (WOB) or placebo (PL) for one week before and two weeks after the Munich Marathon 2013...
October 6, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27695979/aging-and-the-effects-of-a-half-marathon-on-achilles-tendon-force-elongation-relationship
#7
Thijs Maria Anne Ackermans, Gaspar Epro, Christopher McCrum, Kai Daniel Oberländer, Frank Suhr, Maarten Robert Drost, Kenneth Meijer, Kiros Karamanidis
PURPOSE: We aimed to determine whether there are different changes in Achilles tendon (AT) mechanical properties in middle-aged, compared to younger runners that might indicate that tendon fatigue, induced by long-distance running, is age-dependent. METHODS: 27 middle-aged (50-67 years) and 22 younger (21-29 years) participants ran a 21 km route at their own pace (mean and SD: old: 3.1 ± 0.3 m s(-1); young: 3.6 ± 0.5 m s(-1)). We tested for changes in the AT force-elongation relationship using dynamometry and ultrasonography during isometric voluntary ankle plantarflexion ramp contractions, conducted 20-28 h pre-run, immediately pre-run, immediately post-run and 20-28 h post-run...
September 30, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27686166/acute-effects-of-high-intensity-intermittent-training-on-kinematics-and-foot-strike-patterns-in-endurance-runners
#8
P Á Latorre-Román, F García Pinillos, P Bujalance-Moreno, V M Soto-Hermoso
The main purpose of this study was to evaluate running kinematic characteristics and foot strike patterns (FSP) during early and late stages of actual and common high-intensity intermittent training (HIIT): 5 × 2000 m with 120-s recovery between runs. Thirteen healthy, elite, highly trained male endurance runners participated in this study. They each had a personal record in the half-marathon of 70 ± 2.24 min, and each had a minimum experience of 4 years of training and competition. Heart rate (HR) and rate of perceived exertion (RPE) were monitored during HIIT...
August 11, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27677093/hypothalamus-pituitary-adrenocortical-dysfunction-in-elderly-male-marathon-runners-feedback-sensitivity-stress-response-and-effects-on-verbal-memory
#9
Michael Deuschle, Ulrike Gotthardt, Ulrich Schweiger, Michael Dettling, Florian Holsboer, Isabella Heuser
Animal studies suggest that repeated episodes of elevated glucocorticoids lead to a dysregulation of the hypothalamus-pituitary-adrenal (HPA) system at a supra-pituitary level, and to impaired mnemonic function. We compared cognitive tests and both, feedback integrity and stress responsivity of the HPA system, between 11 elderly, male marathon runners - a model of repeated HPA system activation - and 10 sedentary controls. Marathon runners had significantly increased baseline, stress and post-stress ACTH, but not cortisol concentrations...
September 28, 2016: Neuroendocrinology
https://www.readbyqxmd.com/read/27643713/ischemic-colitis-in-an-athlete-running-is-not-always-good-for-you
#10
Diana Horta, Valenti Puig, Luigi Melcarne
Running is popular. Ischemic colitis has been reported in marathon runners. We present a case of an amateur runner who developed ischemic colitis after a relatively short run.
July 2016: Revista Española de Enfermedades Digestivas
https://www.readbyqxmd.com/read/27570626/an-empirical-study-of-race-times-in-recreational-endurance-runners
#11
Andrew J Vickers, Emily A Vertosick
BACKGROUND: Studies of endurance running have typically involved elite athletes, small sample sizes and measures that require special expertise or equipment. METHODS: We examined factors associated with race performance and explored methods for race time prediction using information routinely available to a recreational runner. An Internet survey was used to collect data from recreational endurance runners (N = 2303). The cohort was split 2:1 into a training set and validation set to create models to predict race time...
2016: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/27476066/intrarater-reliability-of-hand-held-dynamometry-in-measuring-lower-extremity-isometric-strength-using-a-portable-stabilization-device
#12
Steven M Jackson, M Samuel Cheng, A Russell Smith, Morey J Kolber
Hand held dynamometry (HHD) is a more objective way to quantify muscle force production (MP) compared to traditional manual muscle testing. HHD reliability can be negatively impacted by both the strength of the tester and the subject particularly in the lower extremities due to larger muscle groups. The primary aim of this investigation was to assess intrarater reliability of HHD with use of a portable stabilization device for lower extremity MP in an athletic population. Isometric lower extremity strength was measured for bilateral lower extremities including hip abductors, external rotators, adductors, knee extensors, and ankle plantar flexors was measured in a sample of healthy recreational runners (8 male, 7 females, = 30 limbs) training for a marathon...
July 21, 2016: Manual Therapy
https://www.readbyqxmd.com/read/27467184/do-women-with-smaller-breasts-perform-better-in-long-distance-running
#13
Nicola Brown, Joanna Scurr
Literature has established that a range of physiological, biomechanical, and training variables influence marathon performance. The influence of anthropometric characteristics has also received attention. However, despite major marathons exceeding 40,000 participants and approximately a third of these runners being female, no data exist on the influence of the breast on running performance. This cross-sectional study aimed to explore the impact of breast mass on marathon finish time. One hundred and sixty-eight of 321 female marathon runners contacted completed an on-line survey focusing on marathon performance during the 2012 London marathon...
November 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27465629/variations-in-oxidative-stress-levels-in-three-days-follow-up-in-ultra-marathon-mountain-race-athletes
#14
Spanidis Ypatios, Stagos Dimitrios, Orfanou Marina, Goutzourelas Nikolaos, Bar-Or David, Spandidos Demetrios, Kouretas Demetrios
The aim of the present study was the monitoring of the redox status of runners participating in a mountain ultra-marathon race of 103 km. Blood samples from 12 runners were collected pre race and 24, 48 and 72 h post race. The samples were analyzed by using conventional oxidative stress markers, such as protein carbonyls (CARB), thiobarbituric acid reactive substances (TBARS), total antioxidant capacity (TAC) in plasma, as well as glutathione (GSH) levels and catalase (CAT) activity in erythrocytes. In addition, two novel markers the static oxidation-reduction potential marker (sORP) and the capacity oxidation-reduction potential (cORP) were measured in plasma...
July 25, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27400865/the-influence-of-long-distance-running-on-sonographic-joint-and-tendon-pathology-results-from-a-prospective-study-with-marathon-runners
#15
Fabian Proft, Mathias Grunke, Christiane Reindl, Felix Mueller, Maximilian Kriegmair, Jan Leipe, Peter Weinert, Hendrik Schulze-Koops, Matthias Witt
BACKGROUND: The impact of physical exercise on joints and tendons is still a matter of debate. The aim of this study was to investigate with ultrasound the acute effects of extreme physical exercise on knee and ankle joints and their surrounding structures in trained athletes. METHODS: Participants of the Munich marathon were examined by arthrosonography before and after long distance running. Ultrasound assessment included grey scale and power Doppler examination of the knee and talocrural joints with surrounding tendons...
2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27336162/prediction-and-quantification-of-individual-athletic-performance-of-runners
#16
Duncan A J Blythe, Franz J Király
We present a novel, quantitative view on the human athletic performance of individual runners. We obtain a predictor for running performance, a parsimonious model and a training state summary consisting of three numbers by application of modern validation techniques and recent advances in machine learning to the thepowerof10 database of British runners' performances (164,746 individuals, 1,417,432 performances). Our predictor achieves an average prediction error (out-of-sample) of e.g. 3.6 min on elite Marathon performances and 0...
2016: PloS One
https://www.readbyqxmd.com/read/27304888/low-vitamin-d-levels-do-not-predict-hyperglycemia-in-elderly-endurance-athletes-but-in-controls
#17
Helmuth Haslacher, Sonja Nistler, Delgerdalai Batmyagmar, Elisabeth Ponocny-Seliger, Thomas Perkmann, Thomas M Scherzer, Michael Kundi, Georg Endler, Franz Ratzinger, Alexander Pilger, Oswald F Wagner, Robert Winker
BACKGROUND AND AIM: Recent studies revealed a link between hypovitaminosis D3 and the risk for hyperglycemia. Further mechanistic and interventional investigations suggested a common reason for both conditions rather than a causal relationship. Exposure to sunlight is the most relevant source of vitamin D3 (25(OH)D), whereas adipose tissue is able to store relevant amounts of the lipophilic vitamin. Since running/bicycling leads to increased out-door time and alters physiological response mechanisms, it can be hypothesized that the correlation between hypovitaminosis D3 and hyperglycemia might be disturbed in outdoor athletes...
2016: PloS One
https://www.readbyqxmd.com/read/27274662/plantar-pressures-during-long-distance-running-an-investigation-of-10-marathon-runners
#18
Erik Hohmann, Peter Reaburn, Kevin Tetsworth, Andreas Imhoff
The objective of this study was to record plantar pressures using an in-shoe measuring system before, during, and after a marathon run in ten experienced long-distance runners with a mean age of 37.7 ± 11.5 years. Peak and mean plantar pressures were recorded before, after, and every three km during a marathon race. There were no significant changes over time in peak and mean plantar pressures for either the dominant or non-dominant foot. There were significant between foot peak and mean plantar pressure differences for the total foot (p = 0...
June 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27273347/influence-of-high-polyphenol-beverage-on-stress-induced-platelet-activation
#19
T Nickel, K Lackermair, J Scherr, A Calatzis, M Vogeser, H Hanssen, G Waidhauser, U Schönermark, H Methe, S Horster, U Wilbert-Lampen, M Halle
OBJECTIVES: Platelets are playing a crucial role in acute cardiovascular events. We investigated if physical stress activates platelets and whether this activation can be inhibited by a polyphenol-enriched diet. METHODS: Blood samples were taken from a total of 103 athletes three weeks before, one day before, immediately as well as 24 hours and 72 hours after a marathon run. Participants were randomized, double-blinded and divided into two groups. One group received a polyphenol-rich beverage the other the same beverage without polyphenols...
2016: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/27196469/comparison-of-changes-in-biochemical-markers-for-skeletal-muscles-hepatic-metabolism-and-renal-function-after-three-types-of-long-distance-running-observational-study
#20
Kyung-A Shin, Ki Deok Park, Jaeki Ahn, Yongbum Park, Young-Joo Kim
The purpose of this study is to compare changes in biochemical markers for the skeletal muscles, hepatic metabolism, and renal function based on extreme long-distance running.Among healthy amateur endurance athletes who participated in a marathon, 100 km-, or 308 km ultramarathon, 15 athletes with similar physical and demographic characteristics were chosen to be the subjects in this study, upon completion of each course. The subjects' blood was collected before and after the course to identify biochemical markers for the skeletal muscles, hepatic metabolism, and renal function...
May 2016: Medicine (Baltimore)
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