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https://www.readbyqxmd.com/read/28904979/the-russians-are-the-fastest-in-marathon-cross-country-skiing-the-engadin-ski-marathon
#1
Pantelis Theodoros Nikolaidis, Jan Heller, Beat Knechtle
It is well known that athletes from a specific region or country are dominating certain sports disciplines such as marathon running or Ironman triathlon; however, little relevant information exists on cross-country skiing. Therefore, the aim of the present study was to investigate the aspect of region and nationality in one of the largest cross-country skiing marathons in Europe, the "Engadin Ski Marathon." All athletes (n = 197,125) who finished the "Engadin Ski Marathon" between 1998 and 2016 were considered...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28902113/comparative-effects-of-two-interval-shuttle-run-training-modes-on-physiological-and-performance-adaptations-in-female-professional-futsal-players
#2
Anderson S Teixeira, Francimara B Arins, Ricardo D De Lucas, Lorival J Carminatti, Naiandra Dittrich, Fábio Yuzo Nakamura, Luiz Guilherme A Guglielmo
The purpose of the present study was to analyze the effects of two shuttle-run interval training (SRIT) models with one and three directional changes per running bout on the aerobic and anaerobic performances of elite female futsal players. Sixteen players competing in the Brazilian National Division League took part in the study. The training protocols consisted of shuttle-run intervals organized in four sets of 4-min bouts with 3- min of rest intervals between the sets. The SRIT models were composed of one (7...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900572/return-to-running-following-a-knee-disarticulation-amputation-a-case-report
#3
Angela R Diebal-Lee, Robert S Kuenzi, Christopher A Rábago
BACKGROUND AND PURPOSE: The evolution of running-specific prostheses has empowered athletes with lower extremity amputations to run farther and faster than previously thought possible; but running with proper mechanics is still paramount to an injury-free, active lifestyle. The purpose of this case report was to describe the successful alteration of intact limb mechanics from a Rearfoot Striking (RFS) to a Non-Rearfoot Striking (NRFS) pattern in an individual with a knee disarticulation amputation, the associated reduction in Average Vertical Loading Rate (AVLR), and the improvement in functional performance following the intervention...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900570/running-injury-development-the-attitudes-of-middle-and-long-distance-runners-and-their-coaches
#4
Karen Krogh Johansen, Adam Hulme, Camma Damsted, Daniel Ramskov, Rasmus Oestergaard Nielsen
BACKGROUND: Behavioral science methods have rarely been used in running injury research. Therefore, the attitudes amongst runners and their coaches regarding factors leading to running injuries warrants formal investigation. PURPOSE: To investigate the attitudes of middle- and long-distance runners able to compete in national championships and their coaches about factors associated with running injury development. METHODS: A link to an online survey was distributed to middle- and long-distance runners and their coaches across 25 Danish Athletics Clubs...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28891824/low-fodmap-a-preliminary-strategy-to-reduce-gastrointestinal-distress-in-athletes
#5
Dana M Lis, Trent Stellingwerff, Cecilia M Kitic, James W Fell, Kiran D K Ahuja
INTRODUCTION: Gastrointestinal (GI) distress in endurance athletes is prevalent and detrimental to performance. Adverse GI symptomatology can be analogous with irritable bowel syndrome, where fermentable oligosaccharide, disaccharide, monosaccharide and polyols (FODMAP) reduction has demonstrated efficacy. This study investigated the effects of low FODMAP (LFOD) diet on GI distress parameters in runners with a history of non-clinical exercise-associated GI symptoms. METHODS: Eleven recreationally competitive runners (5 males, 6 females; 5km personal best 23:00±4:02 min:sec) participated in the study...
September 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28885388/differences-in-physical-capacity-between-junior-and-senior-australian-footballers
#6
Stephen J Kelly, Mark L Watsford, Damien Austin, Rob W Spurrs, Matthew J Pine, Michael J Rennie
The purpose of this study was to profile and compare anthropometric and physical capacities within elite junior and senior Australian football (AF) players of various chronological ages and stages of athletic development. Seventy-nine players, including junior and senior AF players from one professional club were profiled using eleven assessments. Junior players were divided into two groups based on chronological age (under 16 and 18 years) and senior players according to years since drafted to a professional AF team (1-2 years, 3-7 years and 8+ years)...
September 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28882773/shockwave-treatment-for-medial-tibial-stress-syndrome-in-military-cadets-a-single-blind-randomized-controlled-trial
#7
Santiago Gomez Garcia, Silvia Ramon Rona, Martha Claudia Gomez Tinoco, Mikhail Benet Rodriguez, Diego Mauricio Chaustre Ruiz, Francia Piedad Cardenas Letrado, África Lopez-Illescas Ruiz, Juan Maria Alarcon Garcia
Medial tibial stress syndrome (MTSS) is a common injury in athletes and soldiers. Several studies have demonstrated the effectiveness of extracorporeal shockwave treatment (ESWT) in athletes with MTSS. OBJECTIVE: To assess whether one session of focused ESWT is effective in the treatment of military cadets with MTSS. DESIGN: A randomized, prospective, controlled, single-blind, parallel-group clinical study. LEVEL OF EVIDENCE: Ib. SETTING: Military School of Cadets of the Colombian Army...
September 5, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28881769/middle-distance-running-acutely-influences-the-concentration-and-composition-of-serum-bile-acids-potential-implications-for-cancer-risk
#8
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...
August 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28877266/feasibility-of-using-a-hand-held-device-to-characterize-tendon-tissue-biomechanics
#9
Sahand Sohirad, David Wilson, Charlotte Waugh, Evan Finnamore, Alexander Scott
OBJECTIVES: To examine the feasibility of using the MyotonPRO digital palpation device in measuring the transverse stiffness of tendon tissue. DESIGN: Experimental study. METHODS: The MyotonPRO was used to measure the stiffness and related properties of ballistics gel in comparison with an external materials testing system (PCB electronics). The device was then used to measure the same properties of avian Achilles tendons before and after the removal of the overlying skin and subcutaneous tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28872386/on-the-importance-of-front-side-mechanics-in-athletics-sprinting
#10
Thomas Haugen, Jørgen Danielsen, Leif Olav Alnes, David McGhie, Øyvind Sandbakk, Gertjan Ettema
Practitioners have for many years argued that athletic sprinters should optimise front-side mechanics (leg motions occurring in front of the extended line through the torso) and minimise back-side mechanics. This study aimed to investigate if variables related to front- and back-side mechanics can be distinguished from other previously highlighted kinematic variables (spatiotemporal variables and variables related to segment configuration and velocities at touchdown) in how they statistically predict performance...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28872385/new-records-in-human-power
#11
Thomas Haugen, Gøran Paulsen, Stephen Seiler, Øyvind Sandbakk
Maximal aerobic and anaerobic power are crucial performance determinants in most sports disciplines. Numerous studies have published power data from elite athletes over the years, particularly in runners, cyclists, rowers and cross-country skiers. In this invited review, we define the current "world records" in human upper limits of aerobic and anaerobic power. Currently, V̇O2max values of ~7.5 and 7.0 L·min(-1) in male cross-country (XC) skiers and rowers, respectively, and/or ~90 ml·kg(-1)·min(-1) in XC skiers, cyclists and runners can be described as upper human limits for aerobic power...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28859415/performance-tradeoffs-ontogenetic-conflict-and-multisport-athletes-how-is-an-ironman-triathlete-like-a-frog
#12
Ryan Calsbeek, Debora Goedert
Life-history theory is a cornerstone of modern evolutionary biology that addresses myriad phenomena ranging from demography and population structure to the evolution of aging and senescence. Trade-offs may arise in a number of contexts, from allocation-based (e.g., egg size vs. egg number) to genomic conflicts (e.g., intralocus sexual conflict in which genes that perform well in males perform poorly in females). Here we test for performance tradeoffs in human athletes. We show that in Ironman triathletes, swimming performance trades off with cycling and running performance...
August 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28841142/validation-of-a-high-sampling-rate-inertial-measurement-unit-for-acceleration-during-running
#13
Thomas Provot, Xavier Chiementin, Emeric Oudin, Fabrice Bolaers, Sébastien Murer
The musculo-skeletal response of athletes to various activities during training exercises has become a critical issue in order to optimize their performance and minimize injuries. However, dynamic and kinematic measures of an athlete's activity are generally limited by constraints in data collection and technology. Thus, the choice of reliable and accurate sensors is crucial for gathering data in indoor and outdoor conditions. The aim of this study is to validate the use of the accelerometer of a high sampling rate ( 1344 Hz ) Inertial Measurement Unit (IMU) in the frame of running activities...
August 25, 2017: Sensors
https://www.readbyqxmd.com/read/28836881/segmented-forefoot-plate-in-basketball-footwear-does-it-influence-performance-and-foot-joint-kinematics-and-kinetics
#14
Wing-Kai Lam, Winson Chiu-Chun Lee, Wei Min Lee, Christina Zong-Hao Ma, Pui Wah Kong
This study examined the effects of shoes' segmented forefoot stiffness on athletic performance and ankle and metatarsophalangeal joint kinematics and kinetics in basketball movements. Seventeen university basketball players performed running vertical jumps and 5-meter sprints at maximum effort with three basketball shoes of various forefoot plate conditions (medial plate, medial+lateral plates, and no-plate control). One-way repeated measures ANOVAs were used to examine the differences in athletic performance, joint kinematics, and joint kinetics among the three footwear conditions (ɑ = ...
August 24, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28835822/a-case-report-glycopyrrolate-for-treatment-of-exercise-induced-hyperhidrosis
#15
Matthew Negaard, Christopher Anthony, Daniel Bonthius, Matthew Jepson, Britt Marcussen, Daniel Pelzer, Andrew Peterson
OBJECTIVE: Hyperhidrosis can cause dehydration and exercise intolerance. There are several case reports of extremely high sweat rates in athletes. We present as case report of a 17-year-old male with the highest sweat rate recorded in the literature (5.8 L/h). Our goal was to determine if glycopyrrolate, an anticholinergic medication with primarily anti-muscarinic effects that is known to decrease sweat production, would reduce the sweat rate of our subject in a controlled exercise setting...
2017: SAGE open medical case reports
https://www.readbyqxmd.com/read/28830232/influence-of-ground-reaction-force-perturbations-on-anterior-cruciate-ligament-loading-during-sidestep-cutting
#16
Joshua T Weinhandl, Kristian M O'Connor
Anterior cruciate ligament (ACL) injury risk is likely increased under unexpected loading conditions. Such situations may arise from mid-air contact with another athlete, or misjudgments in landing height, stride length or surface compliance resulting in an unbalanced landing and unexpected changes in the ground reaction forces (GRFs). The purpose this study was to identify how GRF perturbations influence ACL loading during sidestep cutting. Muscle-actuated simulations of sidestep cutting were generated and analyzed for 20 subjects...
August 22, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28829838/post-exercise-serum-hepcidin-levels-were-unaffected-by-hypoxic-exposure-during-prolonged-exercise-sessions
#17
Kazushige Goto, Daichi Sumi, Chihiro Kojima, Aya Ishibashi
The purpose of the present study was to determine the influence of hypoxic exposure during prolonged endurance exercise sessions (79 min in total) on post-exercise hepcidin levels in trained male endurance athletes. Ten endurance athletes (mean ± standard deviation; height: 169.8 ± 7.1 cm, weight: 57.1 ± 5.0 kg) conducted two endurance exercise sessions under either a normobaric hypoxic condition [inspired O2 fraction (FiO2) = 14.5%] or a normoxic condition (FiO2 = 20.9%). Exercise consisted of 10 × 3 min running on a treadmill at 95% of maximal oxygen uptake ([Formula: see text]) with 60s of active rest at 60% of [Formula: see text]...
2017: PloS One
https://www.readbyqxmd.com/read/28828089/relationships-between-sprint-jumping-and-strength-abilities-and-800-m-performance-in-male-athletes-of-national-and-international-levels
#18
Beatriz Bachero-Mena, Fernando Pareja-Blanco, David Rodríguez-Rosell, Juan Manuel Yáñez-García, Ricardo Mora-Custodio, Juan José González-Badillo
This study analysed the relationships between sprinting, jumping and strength abilities, with regard to 800 m running performance. Fourteen athletes of national and international levels in 800 m (personal best: 1:43-1:58 min:ss) completed sprint tests (20 m and 200 m), a countermovement jump, jump squat and full squat test as well as an 800 m race. Significant relationships (p < 0.01) were observed between 800 m performance and sprint tests: 20 m (r = 0.72) and 200 m (r = 0.84). Analysing the 200 m run, the magnitude of the relationship between the first to the last 50 m interval times and the 800 m time tended to increase (1st 50 m: r = 0...
September 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28828079/effects-of-fluid-ingestion-on-brain-derived-neurotrophic-factor-and-cognition-during-exercise-in-the-heat
#19
Hee-Tae Roh, Wi-Young So, Su-Youn Cho, Sang-Hoon Suh
We investigated the effects of fluid ingestion during exercise in different environments on the serum brain-derived neurotrophic factor and cognition among athletes. Ten collegiate male athletes (soccer, n = 5; rugby, n = 5) were enrolled, and they completed running tests in the following four conditions (60 min each): 1) thermoneutral temperature at 18°C (group 18); 2) high ambient temperature at 32°C without fluid ingestion (group 32); 3) high ambient temperature at 32°C with water ingestion (group 32+W); and 4) high ambient temperature at 32°C with sports drink ingestion (group 32+S)...
September 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28827381/promotion-of-healthy-weight-control-practices-in-young-athletes
#20
Rebecca L Carl, Miriam D Johnson, Thomas J Martin
Children and adolescents may participate in sports that favor a particular body type. Some sports, such as gymnastics, dance, and distance running, emphasize a slim or lean physique for aesthetic or performance reasons. Participants in weight-class sports, such as wrestling and martial arts, may attempt weight loss so they can compete at a lower weight class. Other sports, such as football and bodybuilding, highlight a muscular physique; young athletes engaged in these sports may desire to gain weight and muscle mass...
August 21, 2017: Pediatrics
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