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https://www.readbyqxmd.com/read/28532238/the-age-related-performance-decline-in-marathon-cross-country-skiing-the-engadin-ski-marathon
#1
Pantelis Theodoros Nikolaidis, Beat Knechtle
Demographic and performance data from 197,825 athletes competing in "Engadin Ski Marathon" between 1998 and 2016 were analysed. When all finishers per age group were considered, there was no gender difference in time (2:59:00 in women versus 2:59:09 h:min:s in men; P = 0.914, η(2) < 0.001) and the main effect of age group on time was trivial (P < 0.001, η(2) = 0.007). When the top 10 finishers per age group were considered, men were faster than women (1:27:32 versus 1:34:19 h:min:s, respectively; P < 0...
May 22, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28530461/increase-in-leg-stiffness-reduces-joint-work-during-backpack-carriage-running-at-slow-velocities
#2
Bernard Liew, Kevin Netto, Susan Morris
Optimal tuning of leg stiffness has been associated with better running economy. Running with load is energetically expensive, which could have a significant impact on athletic performance where backpack carriage is involved. The purpose of this study was to investigate the impact of load magnitude and velocity on leg stiffness. We also explored the relationship between leg stiffness and running joint work. Thirty-one healthy participants ran overground at three velocities (3.0, 4.0, 5.0 m.s(-1)), whilst carrying three load magnitude (0%, 10%, 20% weight)...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28515696/the-reliability-and-validity-of-a-four-minute-running-time-trial-in-assessing-formula-see-text-max-and-performance
#3
Kerry McGawley
Introduction: Traditional graded-exercise tests to volitional exhaustion (GXTs) are limited by the need to establish starting workloads, stage durations, and step increments. Short-duration time-trials (TTs) may be easier to implement and more ecologically valid in terms of real-world athletic events. The purpose of the current study was to assess the reliability and validity of maximal oxygen uptake ([Formula: see text]max) and performance measured during a traditional GXT (STEP) and a four-minute running time-trial (RunTT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28514809/iso-duration-determination-of-d%C3%A2-and-cs-under-laboratory-and-field-conditions
#4
Christoph Triska, Bettina Karsten, Alfred Nimmerichter, Harald Tschan
Whilst Critical Speed (CS) has been successfully translated from the laboratory into the field, this translation is still outstanding for the related maximum running distance (D'). Using iso-duration exhaustive laboratory and field runs, this study investigated the potential interchangeable use of both parameters, D' and CS. After an incremental exercise test, 10 male participants (age: 24.9±2.1 yrs; height: 180.8±5.8 cm; body mass: 75.3±8.6 kg; V̇ ˙VO2peak 52.9±3.1 mL∙min(-1)∙kg(-1)) performed 3 time-to-exhaustion runs on a treadmill followed by 3 exhaustive time-trial runs on a-400 m athletics outdoor track...
May 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28503415/kickboxing-power-hour-case-report-of-fifth-metatarsal-apophysitis-iselin-disease-and-its-magnetic-resonance-imaging-features
#5
Nishant Gupta, Komal Sharma, Itisha Bansal, Yogesh Kumar, Daichi Hayashi
Youth now-a-days are getting more involved in mixed martial arts, with increasing number of cases of lateral foot pain due to various causes. The differential diagnoses of lateral foot pain in the pediatric population include avulsion fracture of the fifth metatarsal base, Jones fracture, diaphyseal stress fracture as well as os vesalianum pedis. We present a case of a 15-year-old athletic boy who presented with left lateral foot pain for a few weeks. The patient was actively involved in Kickboxing as well as active running...
April 2017: Translational pediatrics
https://www.readbyqxmd.com/read/28495249/heart-rate-variability-to-monitor-performance-in-elite-athletes-criticalities-and-avoidable-pitfalls
#6
Daniela Lucini, Ilaria Marchetti, Antonio Spataro, Mara Malacarne, Manuela Benzi, Stefano Tamorri, Roberto Sala, Massimo Pagani
BACKGROUND: Spectral analysis of Heart Rate Variability (HRV) is a simple, non-invasive technique that is widely used in sport to assess sympatho-vagal regulation of the heart. Its employment is increasing partly due to the rising usage of wearable devices. However data acquisition using these devices may be suboptimal because they cannot discriminate between sinus and non-sinus beats and do not record any data regarding respiratory frequency. This information is mandatory for a correct clinical interpretation...
May 3, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28491886/the-effect-of-the-number-of-carries-among-college-running-backs-on-future-injury-risk-and-performance-in-the-national-football-league
#7
Matthew J Kraeutler, John W Belk, Eric C McCarty
BACKGROUND: There has been speculation that running backs with an excessive number of carries in college are less likely to be successful in the National Football League (NFL). PURPOSE: To determine whether there is a correlation between number of carries by college running backs and future performance and injury risk in the NFL. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Using the ESPN archives of National Collegiate Athletic Association and NFL running backs, the following inclusion criteria were used: running backs who played their last college season from 1999 through 2012 and who were drafted in the first 4 rounds of the NFL draft following their college career...
April 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28488940/elite-african-marathoners-specialize-earlier-than-elite-non-african-marathoners
#8
Tyler J Noble, Robert F Chapman
PURPOSE: To assess differences in event specific specialization between elite African and Non-African male marathon runners on the basis of age, performance, and career length. METHODS: The top 90 African marathoners from 2001-2015 were compared to the top 90 Non-African marathoners from the same time period across various markers related to specialization age, performance, and career length. Independent t-tests were used to identify significant differences (P<0...
May 10, 2017: International Journal of Sports Physiology and Performance
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
#9
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/28482364/association-of-step-width-with-accelerated-sprinting-performance-and-ground-reaction-force
#10
Ryu Nagahara, Mirai Mizutani, Akifumi Matsuo, Hiroaki Kanehisa, Tetsuo Fukunaga
This study aimed to describe changes in step width (SW) during accelerated sprinting, and to clarify the relationship of SW with sprinting performance and ground reaction forces. 17 male athletes performed maximal-effort 60 m sprints. The SW and other spatiotemporal variables, as well as ground reaction impulses, over a 52 m distance were calculated. Average values for each 4 steps during acceleration were calculated to examine relationships among variables in different sections. The SW rapidly decreased up to the 13th step and slightly afterward during accelerated sprinting, showing a bilinear phase profile...
May 8, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28480693/factors-determining-800-m-running-performance-in-young-male-athletes
#11
Ramon Cruz, Romulo C de Moraes Bertuzzi, Danilo L Alves, Rafael Azevedo, Phelipe H Cardoso Castro, Jefferson Verbena Freitas, Adriano E Lima-Silva, Fernando R de Oliveira, Jorge R Perrout Lima
BACKGROUND: The aim of the present study was to identify determinant variables on 800-m running performance in young male athletes derived from field tests and biological maturity. METHODS: A total of 89 athletes, aged between 13 and 15 years old, performed a 800-m running trial and a battery of tests which involved anthropometric measurements, a running anaerobic test (RAST), a flexibility test (sit-and-reach), a counter movement jump test and progressive test for aerobic fitness evaluation...
May 5, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28479388/acceleration-based-training-a-new-mode-of-training-in-senescent-rats-improving-performance-and-left-ventricular-and-muscle-functions
#12
Thierry Launay, Iman Momken, Serge Carreira, Nathalie Mougenot, Xian-Long Zhou, Leanne De Koning, Romain Niel, Bruno Riou, Véronique Billat, Sophie Besse
High intensity training (HIT) has been shown to improve maximal aerobic capacity and muscle protein synthesis but has not yet been investigated in senescent rats. We hypothesized that the change of speed (acceleration) during each bout of HIT acts as a stimulus responsible for the adaptations of the organism to exercise. Twenty two month-old (mo) rats (n=14) were subjected to a short acceleration protocol (20-30min) of exercise, comprising 3 independent bouts of acceleration and compared to an age-matched sedentary group (n=14)...
May 4, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28477023/middle-distance-running-acutely-influences-the-concentration-and-composition-of-serum-bile-acids-potential-implications-for-cancer-risk
#13
Elisa Danese, Gian Luca Salvagno, Cantor Tarperi, Davide Negrini, Martina Montagnana, Luca Festa, Fabian Sanchis-Gomar, Federico Schena, Giuseppe Lippi
BACKGROUND: This study was aimed to investigate the acute effect of medium-distance running on bile acids concentration and composition, in order to verify whether the positive impact of physical exercise on cancer risk may also be mediated by variation of bile acids concentration and composition in serum. METHODS: The concentration and composition of serum bile acids was analyzed in 30 middle-aged and healthy recreational athletes with a reference liquid chromatography-mass spectrometry technique, immediately before and shortly after the end of the running trial...
April 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28475550/duration-specific-running-performance-in-elite-gaelic-football
#14
Shane Malone, Barry Solan, Brian Hughes, Kieran Collins
The aim of the current investigation was to determine the position and duration specific running performance of elite Gaelic football players through the use of a moving average method. Global positioning system data (4-Hz, VX Sport, New-Zealand) were collected from thirty-five (n = 35) elite Gaelic football players across a two season period. A total of 32 competitive matches were analysed with 300 full match play data samples obtained for final analysis. Players were categorised based on positional groups; full-back, half-back, midfield, half- forward and full-forward...
April 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28475548/warm-up-exercises-may-not-be-so-important-for-enhancing-submaximal-running-performance
#15
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/28469760/reliability-and-validity-of-a-new-test-of-agility-and-skill-for-female-amateur-soccer-players
#16
Mehmet Kutlu, Hakan Yapici, Abdullah Yilmaz
The aim of this study was to evaluate the Agility and Skill Test, which had been recently developed to assess agility and skill in female athletes. Following a 10 min warm-up, two trials to test the reliability and validity of the test were conducted one week apart. Measurements were collected to compare soccer players' physical performance in a 20 m sprint, a T-Drill test, the Illinois Agility Run Test, change-of-direction and acceleration, as well as agility and skill. All tests were completed following the same order...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28467934/ppar%C3%AE-promotes-running-endurance-by-preserving-glucose
#17
Weiwei Fan, Wanda Waizenegger, Chun Shi Lin, Vincenzo Sorrentino, Ming-Xiao He, Christopher E Wall, Hao Li, Christopher Liddle, Ruth T Yu, Annette R Atkins, Johan Auwerx, Michael Downes, Ronald M Evans
Management of energy stores is critical during endurance exercise; a shift in substrate utilization from glucose toward fat is a hallmark of trained muscle. Here we show that this key metabolic adaptation is both dependent on muscle PPARδ and stimulated by PPARδ ligand. Furthermore, we find that muscle PPARδ expression positively correlates with endurance performance in BXD mouse reference populations. In addition to stimulating fatty acid metabolism in sedentary mice, PPARδ activation potently suppresses glucose catabolism and does so without affecting either muscle fiber type or mitochondrial content...
May 2, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28459360/strength-training-for-middle-and-long-distance-performance-a-meta-analysis
#18
Nicolas Berryman, Inigo Mujika, Denis Arvisais, Marie Roubeix, Carl Binet, Laurent Bosquet
PURPOSE: The objective of this study was to assess the net effects of strength training on middle- and long-distance performance through a meta-analysis of the available literature. METHODS: Three databases were searched from which 28 out of 554 potential studies met all inclusion criteria. Standardized mean differences (SMDs) were calculated and weighted by the inverse of variance to calculate an overall effect and its 95% confidence interval (CI). Subgroup analyses were conducted to determine whether the strength-training intensity, duration and frequency, and population performance level, age, sex and sport were outcomes that may influence the magnitude of the effect...
May 1, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28439212/effect-of-thyme-extract-supplementation-on-lipid-peroxidation-antioxidant-capacity-pgc-1%C3%AE-content-and-endurance-exercise-performance-in-rats
#19
Mostafa Khani, Pezhman Motamedi, Mohammad Reza Dehkhoda, Saeed Dabagh Nikukheslat, Pouran Karimi
BACKGROUND: Athletes have a large extent of oxidant agent production. In the current study, we aimed to determine the influence of thyme extract on the endurance exercise performance, mitochondrial biogenesis, and antioxidant status in rats. METHODS: Twenty male Wistar rats were randomly divided into two groups receiving either normal drinking water (non-supplemented group, n = 10) or thyme extract, 400 mg/kg, (supplemented group, n = 10). Rats in both groups were subjected to endurance treadmill training (27 m/min, 10% grade, 60 min, and 5 days/week for 8 weeks)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28404556/recent-acute-prerace-systemic-illness-in-runners-increases-the-risk-of-not-finishing-the-race-safer-study-v
#20
Leigh Gordon, Martin Schwellnus, Sonja Swanevelder, Esme Jordaan, Wayne Derman
AIM: There are limited data on the negative effects of exercise in athletes with acute infective illness. The aim of this study was to determine whether a recently diagnosed prerace acute illness in runners affects the ability to finish a race. METHODS: Runners were prospectively evaluated in the 3 days before the race for acute infective illness and then received participation advice using clinical criteria based on systemic or localised symptoms/signs. We compared the did-not-start and the did-not-finish frequencies of ill runners (Ill=172: localised=58...
April 12, 2017: British Journal of Sports Medicine
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