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https://www.readbyqxmd.com/read/29200895/physiological-and-training-characteristics-of-recreational-marathon-runners
#1
Dan Gordon, Sarah Wightman, Itay Basevitch, James Johnstone, Carolina Espejo-Sanchez, Chelsea Beckford, Mariette Boal, Adrian Scruton, Mike Ferrandino, Viviane Merzbach
Purpose: The aim of this study was to examine the physical and training characteristics of recreational marathon runners within finish time bandings (2.5-3 h, 3-3.5 h, 3.5-4 h, 4-4.5 h and >4.5 h). Materials and methods: A total of 97 recreational marathon runners (age 42.4 ± 9.9 years; mass 69.2 ± 11.3 kg; stature 172.8 ± 9.1 cm), with a marathon finish time of 229.1 ± 48.7 min, of whom n = 34 were female and n = 63 were male, completed an incremental treadmill test for the determination of lactate threshold (LT1), lactate turn point (LT2) and running economy (RE)...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/29199781/velocity-distribution-of-women-s-30-km-cross-country-skiing-during-olympic-games-from-2002-2014
#2
Wlodzimierz S Erdmann, Dorota Dancewicz-Nosko, Vasilios Giovanis
BACKGROUND: Within several investigated endurance sport disciplines the distribution of load of the best competitors has a manner of evenly or slightly rising velocity values. Unfortunately many other competitors have usually diminishing values or when they are very poor they have evenly values. The aim of this study was to investigate distribution of velocity within 30-km cross-country female skiers. METHODS: Cross-country skiing runs were investigated of Olympic Games 2002-2014 (Salt Lake City, Turin, Vancouver, Sochi)...
December 1, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29184508/non-motorized-treadmill-running-is-associated-with-higher-cardiometabolic-demands-compared-with-overground-and-motorized-treadmill-running
#3
Robert B Edwards, Paul J Tofari, Stuart J Cormack, Douglas G Whyte
The aim of this study was to compare the cardiometabolic demands of running on a curved non-motorized treadmill (cNMT) with overground (OVR) and motorized treadmill (MOT) running. Fourteen trained male (n = 7) and female (n = 7) runners ([Formula: see text] 56.6 ± 4.0 mL.kg-1.min-1) participated in the study. Each experimental session consisted of 5 × 6-min bouts of running at progressively higher speeds, separated by 6-min rest (females 9-15 km.h-1; males 10.5-16.5 km.h-1). Oxygen consumption ([Formula: see text]) and heart rate (HR) during the last 2 min of each bout were measured using a portable metabolic cart...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29182895/efficacy-of-downhill-running-training-for-improving-muscular-and-aerobic-performances
#4
Junichi Toyomura, Hisashi Mori, Kota Tayashiki, Masayoshi Yamamoto, Hiroaki Kanehisa, Sumiaki Maeo
This study investigated effects of downhill (DR) versus level (LR) running training on various muscular and aerobic performances. Eighteen healthy young males conducted either DR (DR group [DRG], n = 10: -10% slope) or LR (LR group [LRG], n = 8) training at a target heart rate (HR) associated with lactate threshold (LT) for 20 min·session<sup>-1</sup>, 3 sessions·week<sup>-1</sup>, for 5 weeks. Before and after the interventions, the following variables were measured: knee extension torque (-150, -30, 0, 30, 150°·s<sup>-1</sup>), leg extension power (simultaneous hip and knee extension: 0...
November 28, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29176383/effect-of-jump-interval-training-on-kinematics-of-the-lower-limbs-and-running-economy
#5
Jonathan Ache-Dias, Juliano Dal Pupo, Rodolfo A Dellagrana, Anderson S Teixeira, Luis Mochizuki, Antônio R P Moro
This study analyzed the effects of the addition of jump interval training (JIT) to continuous endurance training (40-min running at 70% of peak aerobic velocity, three times per week for four weeks) on kinematic variables and running economy (RE) during submaximal constant-load running. Eighteen recreational runners, randomized into control (CG) or experimental (EG) groups performed the endurance training. In addition, the EG performed the JIT twice per week, which consisted of four to six bouts of continuous vertical jumping (30s) with five-minute intervals...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29159682/physiological-and-biomechanical-responses-of-highly-trained-distance-runners-to-lower-body-positive-pressure-treadmill-running
#6
Kyle R Barnes, Jessica N Janecke
BACKGROUND: As a way to train at faster running speeds, add training volume, prevent injury, or rehabilitate after an injury, lower-body positive pressure treadmills (LBPPT) have become increasingly commonplace among athletes. However, there are conflicting evidence and a paucity of data describing the physiological and biomechanical responses to LBPPT running in highly trained or elite caliber runners at the running speeds they habitually train at, which are considerably faster than those of recreational runners...
November 21, 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/29126956/effect-of-graduated-compression-stockings-on-venous-lower-limb-hemodynamics-in-healthy-amateur-runners
#7
Oswaldo Teno Castilho Junior, Nei Rodrigues Alves Dezotti, Marcelo Bellini Dalio, Edwaldo Edner Joviliano, Carlos Eli Piccinato
OBJECTIVE: The objective of this study was to analyze the effect of graduated compression stockings (GCS) on venous lower limb hemodynamics in healthy amateur runners. METHODS: Ten runners were evaluated during rest and after a 10-km run without and with knee-high GCS of 20 to 30 mm Hg. Air plethysmography evaluated venous filling index (VFI), ejection fraction, and residual volume fraction (RVF) in both limbs. Capillary lactate level and heart rate were also measured...
November 7, 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/29112626/effects-of-ad-libitum-low-carbohydrate-high-fat-dieting-in-middle-age-male-runners
#8
Alexander J Heatherly, Lauren G Killen, Ashton F Smith, Hunter S Waldman, Angela Hollingsworth, Christie L Seltmann, Eric K O'Neal
PURPOSE: This study examined the effects of a 3-week ad libitum high fat (~70% of calories), low carbohydrate (<50 g/day) diet (LCHF) on markers of endurance performance in middle-aged, recreationally competitive male runners. METHODS: All subjects (n = 8) following their normal HC diet had anthropometric measures assessed and completed 5, 10-min running bouts at multiple individual race paces in the heat while physiological, metabolic variables and perceptual responses were recorded...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29109688/weak-relationships-between-stint-duration-physical-and-skilled-match-performance-in-australian-football
#9
David M Corbett, Alice J Sweeting, Sam Robertson
Australian Rules football comprises physical and skilled performance for more than 90 min of play. The cognitive and physiological fatigue experienced by participants during a match may reduce performance. Consequently, the length of time an athlete is on the field before being interchanged (known as a stint), is a key tactic which could maximize the skill and physical output of the Australian Rules athlete. This study developed two methods to quantify the relationship between athlete time on field, skilled and physical output...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29079672/fast-tracked-rehabilitation-and-return-to-sport-of-an-elite-rugby-player-with-a-complicated-posterolateral-corner-injury-and-associated-peroneal-paralysis
#10
L D A Paget, P P F M Kuijer, M Maas, G M M J Kerkhoffs
Acute posterolateral corner injuries of the knee with associated hamstring avulsions and peroneal paralysis are rare in rugby. Regain of motor function following a complete paralysis is documented to be 38%. To our knowledge, only one case describes return to preinjury level of competitive sport taking up to 27 months. A 24-year-old international level rugby player, a medical student, sustained an acute posterolateral knee injury with associated anterior cruciate ligament tear, bicep femoris and semimembranosus avulsions as well as a complete peroneal paralysis...
October 27, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29075862/concomitant-external-pneumatic-compression-treatment-with-consecutive-days-of-high-intensity-interval-training-reduces-markers-of-proteolysis
#11
Cody T Haun, Michael D Roberts, Matthew A Romero, Shelby C Osburn, James C Healy, Angelique N Moore, Christopher B Mobley, Paul A Roberson, Wesley C Kephart, Petey W Mumford, Michael D Goodlett, David D Pascoe, Jeffrey S Martin
PURPOSE: To compare the effects of external pneumatic compression (EPC) and sham when used concurrently with high intensity interval training (HIIT) on performance-related outcomes and recovery-related molecular measures. METHODS: Eighteen recreationally endurance-trained male participants (age: 21.6 ± 2.4 years, BMI: 25.7 ± 0.5 kg/m(2), VO2peak: 51.3 ± 0.9 mL/kg/min) were randomized to balanced sham and EPC treatment groups. Three consecutive days of HIIT followed by EPC/sham treatment (Days 2-4) and 3 consecutive days of recovery (Days 5-7) with EPC/sham only on Days 5-6 were employed...
December 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29070954/race-predictors-and-hemodynamic-alteration-after-an-ultra-trail-marathon-race
#12
Noppon Taksaudom, Natee Tongsiri, Amarit Potikul, Chawakorn Leampriboon, Apichat Tantraworasin, Anong Chaiyasri
OBJECTIVE: Unique rough-terrain ultra-trail running races have increased in popularity. Concerns regarding the suitability of the candidates make it difficult for organizers to manage safety regulations. The purpose of this study was to identify possible race predictors and assess hemodynamic change after long endurance races. METHODS: We studied 228 runners who competed in a 66 km-trail running race. A questionnaire and noninvasive hemodynamic flow assessment including blood pressure, heart rate, stroke volume, stroke volume variation, systemic vascular resistance, cardiac index, and oxygen saturation were used to determine physiologic alterations and to identify finish predictors...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/29064284/pacing-in-age-group-marathoners-in-the-new-york-city-marathon
#13
Pantelis T Nikolaidis, Beat Knechtle
The aim of the study was to investigate how women and men age group runners pace during a large city marathon. We analysed changes in running speed by splits of 5 km in 20,283 women and 28,282 men age group runners competing in the 2015 edition of the "New York City Marathon". A moderate split×sex interaction on running speed (p < 0.001, η(2) = 0.108) was observed with men showing a larger decrease in speed from the fastest split (5-10 km) to the slowest one (35-40 km) than women (21.1 vs. 16.7%), and a different pattern was observed in the 25-30 km split (increase in women, decrease in men)...
October 24, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/29038746/influence-of-exercise-duration-on-cardiorespiratory-responses-energy-cost-and-tissue-oxygenation-within-a-6-hour-treadmill-run
#14
Hugo A Kerhervé, Scott McLean, Karen Birkenhead, David Parr, Colin Solomon
PURPOSE: The physiological mechanisms for alterations in oxygen utilization ([Formula: see text]) and the energy cost of running (Cr ) during prolonged running are not completely understood, and could be linked with alterations in muscle and cerebral tissue oxygenation. METHODS: Eight trained ultramarathon runners (three women; mean ± SD; age 37 ± 7 yr; maximum [Formula: see text] 60 ± 15 mL min(-1) kg(-1)) completed a 6 hr treadmill run (6TR), which consisted of four modules, including periods of moderate (3 min at 10 km h(-1), 10-CR) and heavy exercise intensities (6 min at 70% of maximum [Formula: see text], HILL), separated by three, 100 min periods of self-paced running (SP)...
2017: PeerJ
https://www.readbyqxmd.com/read/29032392/exercise-and-gastrointestinal-symptoms-running-induced-changes-in-intestinal-permeability-and-markers-of-gastrointestinal-function-in-asymptomatic-and-symptomatic-runners
#15
Elisa Karhu, Richard A Forsgård, Lauri Alanko, Henrik Alfthan, Pirkko Pussinen, Esa Hämäläinen, Riitta Korpela
PURPOSE: Athletes frequently experience gastrointestinal (GI) symptoms during training and competition. Although the prevalence of exercise-induced GI symptoms is high, the mechanisms leading to GI distress during exercise are not fully understood. The aim of this study was to identify running-induced changes in intestinal permeability and markers of GI function and investigate their association with gastrointestinal symptoms. METHODS: We recruited 17 active runners who we allocated as either asymptomatic or symptomatic based on their history of experiencing GI symptoms during running...
December 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29018355/criterion-validity-of-commercially-available-physical-activity-tracker-to-estimate-step-count-covered-distance-and-energy-expenditure-during-sports-conditions
#16
Yvonne Wahl, Peter Düking, Anna Droszez, Patrick Wahl, Joachim Mester
Background: In the past years, there was an increasing development of physical activity tracker (Wearables). For recreational people, testing of these devices under walking or light jogging conditions might be sufficient. For (elite) athletes, however, scientific trustworthiness needs to be given for a broad spectrum of velocities or even fast changes in velocities reflecting the demands of the sport. Therefore, the aim was to evaluate the validity of eleven Wearables for monitoring step count, covered distance and energy expenditure (EE) under laboratory conditions with different constant and varying velocities...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28988515/pacing-profiles-of-senior-men-and-women-at-the-2017-iaaf-world-cross-country-championships
#17
Brian Hanley
The purpose of this study was to analyse and compare pacing profiles of senior men and women competing in the 2017 World Cross Country Championships. Finishing and split times were collated for 118 men and 81 women competing over the newly introduced race distance of 10 km (five laps of approximately 2 km). Athletes were grouped according to finishing time, and changes in pace measured using lap times, except between Laps 1 and 2 because of a shorter first lap (times relative to the winner were used instead)...
October 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28979213/taurine-a-potential-ergogenic-aid-for-preventing-muscle-damage-and-protein-catabolism-and-decreasing-oxidative-stress-produced-by-endurance-exercise
#18
Flávia G De Carvalho, Bryan S M Galan, Priscila C Santos, Kelly Pritchett, Karina Pfrimer, Eduardo Ferriolli, Marcelo Papoti, Júlio S Marchini, Ellen C de Freitas
The aim of this study was to evaluate the effects of taurine and chocolate milk supplementation on oxidative stress and protein metabolism markers, and aerobic parameters in triathletes. Methods: A double-blind, crossover study was conducted with 10 male triathletes, aged 30.9 ± 1.3 year, height 1.79 ± 0.01 m and body weight 77.45 ± 2.4 kg. Three grams of taurine and 400 ml of chocolate milk (TAUchoc), or a placebo (chocolate milk) (CHOC) was ingested post exercise for 8 weeks. Oxidative stress marker levels, and 24 h urinary nitrogen, creatinine, and urea excretion were measured before and after 8 weeks of training and supplementation with TAUchoc or CHOC...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28955243/the-effect-of-a-100-km-ultra-marathon-under-freezing-conditions-on-selected-immunological-and-hematological-parameters
#19
Alena Žákovská, Beat Knechtle, Daniela Chlíbková, Marie Miličková, Thomas Rosemann, Pantelis T Nikolaidis
Although moderate exercise is beneficial for the human body and its immune system, exhaustive ultra-endurance performance in cold conditions might be harmful. The aim of this study was to examine the effect of a 100-km ultra-marathon under cold conditions (temperatures from -1°C to +1°C) on selected immunological, biochemical and hematological parameters. Participants were 15 runners (12 men and three women, age 40.3 ± 9.7 years, body mass 67.3 ± 9.0 kg and body height 1.74 ± 0.10 m, mean ± standard deviation)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28950400/standardized-met-value-underestimates-the-energy-cost-of-treadmill-running-in-men
#20
Helouane M Ázara, Paulo T V Farinatti, Adrian W Midgley, Fabrício Vasconcellos, Patrícia Vigário, Felipe A Cunha
The main purpose of the present study was to compare the reference metabolic equivalent (MET) value and observed resting oxygen uptake (VO2) for defining cardiorespiratory fitness (VO2max) and characterizing the energy cost of treadmill running. A heterogeneous cohort of 114 healthy men volunteered to participate. In Part 1 of the study, 114 men [mean±SD, age: 24±5 years; height: 177.1±7.9 cm; body mass: 75.0±10.0 kg] visited the laboratory twice for assessment of resting and maximal VO2 values to compare the reference MET value vs...
November 2017: International Journal of Sports Medicine
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