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https://www.readbyqxmd.com/read/28303338/blood-glucose-kinetics-and-physiological-changes-in-a-type-1-diabetic-finisher-of-the-ultraman-triathlon-a-case-study
#1
Christopher W Bach, Daniel A Baur, William S Hyder, Michael J Ormsbee
PURPOSE: To investigate the blood glucose kinetics and physiological effects experienced by a type 1 diabetic (T1D) finisher of a 3-day, multi-stage ultra endurance triathlon consisting of a 10 km swim and 144.8 km bike (stage 1), a 275.4 km bike (stage 2), and an 84.4 km run (stage 3). METHODS: The athlete self-monitored blood glucose (SMBG) levels via fingerstick blood draw and hand-held glucometer. Researchers evaluated blood glucose kinetics via a continuous glucose monitoring device...
March 16, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28290716/cycling-vs-uphill-walking-impact-on-locomotor-muscle-fatigue-and-running-exercise
#2
Benjamin Pageaux, Jean Theurel, Romuald Leper
PURPOSE: To describe the effects of uphill walking versus cycling exercises on knee extensors (KE) neuromuscular properties and subsequent running exercise. METHODS: Nine athletes performed four different sessions (one familiarization and three experimental sessions, visit 2 to 4). Visit 2 (cycling + 10 km condition) consisted of the completion of 1-h cycling followed by a 10 km running time trial. Visit 3 consisted of the completion of 1-h uphill walking followed by a 10 km running exercise (RE)...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28288302/whole-body-active-warm-up-and-inspiratory-muscle-warm-up-do-not-improve-running-performance-when-carrying-thoracic-loads
#3
Mark A Faghy, Peter Ian Brown
Whole body active warm ups (AWU) and inspiratory muscle warm up (IMW) prior to exercise improves performance on some endurance exercise tasks. This study investigated the effects of AWU with and without IMW upon 2.4 km running time-trial performance while carrying a 25 kg backpack, a common task and backpack load in physically demanding occupations. Participants (n = 9) performed five 2.4 km running time-trials with a 25 kg thoracic load preceded in random order by 1) IMW comprising 2 x 30 inspiratory efforts against a pressure-threshold load of 40 % maximal inspiratory pressure (PImax), 2) 10 min unloaded running (AWU) at lactate turnpoint (10...
March 13, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28279581/exposure-of-in-pram-babies-to-airborne-particles-during-morning-drop-in-and-afternoon-pick-up-of-school-children
#4
Prashant Kumar, Ioar Rivas, Lovish Sachdeva
In-pram babies are more susceptible to air pollution effects, yet studies assessing their exposure are limited. We measured size-resolved particle mass (PMC; 0.25-32 μm) and number (PNC; 0.2-1 μm) concentrations on a 2.7 km route. The instruments were placed inside a baby pram. The route passed through 4 traffic intersections (TIs) and a bus stand. A total of ∼87 km road length was covered through 64 trips, made during school drop-in (morning) and pick-up (afternoon) hours. The objectives were to assess PMC and PNC exposure to in-pram babies at different route segments, understand their physicochemical characteristics and exposure differences between in-pram babies and adults carrying them...
March 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28265506/immediate-effects-of-eva-midsole-resilience-and-upper-shoe-structure-on-running-biomechanics-a-machine-learning-approach
#5
Andrea N Onodera, Wilson P Gavião Neto, Maria Isabel Roveri, Wagner R Oliveira, Isabel Cn Sacco
BACKGROUND: Resilience of midsole material and the upper structure of the shoe are conceptual characteristics that can interfere in running biomechanics patterns. Artificial intelligence techniques can capture features from the entire waveform, adding new perspective for biomechanical analysis. This study tested the influence of shoe midsole resilience and upper structure on running kinematics and kinetics of non-professional runners by using feature selection, information gain, and artificial neural network analysis...
2017: PeerJ
https://www.readbyqxmd.com/read/28263283/running-technique-is-an-important-component-of-running-economy-and-performance
#6
Jonathan P Folland, Sam J Allen, Matthew I Black, Joseph C Handsaker, Stephanie E Forrester
Despite an intuitive relationship between technique and both running economy (RE) and performance, and the diverse techniques employed by runners to achieve forward locomotion, the objective importance of overall technique and the key components therein remain to be elucidated. PURPOSE: To determine the relationship between individual and combined kinematic measures of technique with both RE and performance. METHODS: Ninety-seven endurance runners (47 female) of diverse competitive standards performed a discontinuous protocol of incremental treadmill running (4 min stages, 1 km...
March 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28249345/mechanical-alterations-during-800-m-self-paced-track-running
#7
Olivier Girard, Gregoire P Millet, Jean-Paul Micallef
We assessed the time course of running mechanical alterations during an 800-m. On a 200-m indoor track, 18 physical education students performed an 800-m self-paced run. Once per lap, ground reaction forces were measured by a 5-m-long force platform system, and used to determine running kinetics/kinematics and spring-mass characteristics. Compared with 100 m (19.4±1.8 km.h(-1)) running velocity progressively decreased at 300, 500 m but levelled-off at 700 m marks (-5.7±4.6, -10.4±8.3, and -9.1±13...
March 1, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28229568/yo-yo-ir1-vs-incremental-continuous-running-test-for-prediction-of-3000-m-performance
#8
Boris Schmitz, Andreas Klose, Katrin Schelleckes, Charlotte M Jekat, Michael Krüger, Stefan-Martin Brand
BACKGROUND: This study aimed to compare physiological responses during the Yo-Yo intermittent recovery level 1 (Yo-Yo IR1) test and an incremental continuous running field test (ICRT) and to analyze their predictive value on 3000 m running performance. METHODS: Forty moderately trained individuals (18 females) performed the ICRT and Yo-Yo IR1 test to exhaustion. The ICRT was performed as graded running test with an increase of 2.0 km·h-1 after each 3 min interval for lactate diagnostic...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28198604/energy-requirements-of-tyre-pulling
#9
Per M Fredriksen, Asgeir Mamen
BACKGROUND: We have investigated the effect using walking poles and pulling tyres at 4 and 6 km·h-1 (1.11 and 1.67 m·s-1) speeds on oxygen uptake (V̇ O2) and heart rate. METHODS: Twelve subjects, 6 males, with a mean (SD) age of 25.2(6.9) years participated in field tests involving walking without poles, walking with poles and tyre pulling with poles. RESULTS: Increasing the load caused the largest increases in energy demand, more than 4 MET...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28195978/lack-of-influence-of-muscular-performance-parameters-on-spatio-temporal-adaptations-with-increased-running-velocity
#10
Luis E Roche-Seruendo, Felipe García-Pinillos, Joana Haicaguerre, Ana V Bataller-Cervero, Víctor M Soto-Hermoso, Pedro Á Latorre-Román
This study aimed to analyse the influence of muscular performance parameters on spatio-temporal gait characteristics during running when gradually increasing speed. 51 recreationally trained male endurance runners (age: 28 ± 8 years) voluntarily participated in this study. Subjects performed a battery of jumping tests (squat jump, countermovement jump, and 20 cm drop jump), and after that, the subjects performed an incremental running test (10 to 20 km/h) on a motorized treadmill. Spatio-temporal parameters were measured using the OptoGait system...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28184175/the-motivational-influence-of-milestone-times-on-10-km-running-performance
#11
Daniel M Cushman, Ashwin Babu, Benjamin Marshall, Monica Rho
To date, little research has been conducted to evaluate the potentially motivating effect of completing a race at a specific "milestone" finishing time. As this is difficult to perform in a laboratory setting, we examined 10-km runners from a large cohort to see if they were more likely to complete a race before rather than after a set milestone time (40:00, 45:00, and 50:00). Frequency distributions for finishers of each sex were created in 30-second time groups, with ideal normal distributions modeled based on this data...
August 2016: Int J Perform Anal Sport
https://www.readbyqxmd.com/read/28181710/on-field-prediction-vs-monitoring-of-aerobic-capacity-markers-using-submaximal-lactate-and-heart-rate-measures
#12
Ibai Garcia-Tabar, Mikel Izquierdo, Esteban M Gorostiaga
This study aimed to validate the use of a single blood lactate concentration measurement taken following a 5-min running bout at 10 km·h(-1) (BLC10 ) and the speed associated with 90% of maximal heart rate (S90 ) to predict and monitor fixed blood lactate concentration (FBLC) thresholds in athletes. Three complementary studies were undertaken. Study-I: A cross-sectional study examining the associations of BLC10 and S90 with running speeds at FBLC of 3 (S3mM) and 4 mmol·L(-1) (S4mM) in 100 athletes. Study-II: A cross-validation study assessing the predictive capacity of BLC10 and S90 to estimate FBLC thresholds in real practice...
February 9, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28177747/short-term-heat-acclimation-improves-the-determinants-of-endurance-performance-and-5-km-running-performance-in-the-heat
#13
Carl A James, Alan J Richardson, Peter W Watt, Ashley G B Willmott, Oliver R Gibson, Neil S Maxwell
This study investigated the effect of 5 days of controlled short-term heat acclimation (STHA) on the determinants of endurance performance and 5-km performance in runners, relative to the impairment afforded by moderate heat stress. A control group (CON), matched for total work and power output (2.7 W·kg(-1)), differentiated thermal and exercise contributions of STHA on exercise performance. Seventeen participants (10 STHA, 7 CON) completed graded exercise tests (GXTs) in cool (13 °C, 50% relative humidity (RH), pre-training) and hot conditions (32 °C, 60% RH, pre- and post-training), as well as 5-km time trials (TTs) in the heat, pre- and post-training...
March 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28166116/cerebral-blood-flow-responses-to-aquatic-treadmill-exercise
#14
Rhodri Parfitt, Marianne Y Hensman, Samuel J E Lucas
INTRODUCTION: Aquatic treadmills are used as a rehabilitation method for conditions such as spinal cord injury, osteoarthritis and stroke, and can facilitate an earlier return to exercise training for athletes. However, their effect on cerebral blood flow (CBF) responses has not been examined. We tested the hypothesis that aquatic treadmill exercise would augment CBF and lower heart rate compared to land-based treadmill exercise. METHODS: Eleven participants completed incremental exercise (crossover design) starting from walking pace [4 km/h, immersed to iliac crest (aquatic), 6 km/h (land)] and increasing 1 km/h every 2 min up to 10 km/h for aquatic (maximum belt speed) or 12 km/h for land...
February 4, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28160171/modeling-of-air-pollutant-concentrations-in-an-industrial-region-of-turkey
#15
Gizem Tuna Tuygun, Hicran Altuğ, Tolga Elbir, Eftade E Gaga
The hourly SO2 and PM10 concentrations in ambient air of the Kutahya city located at the western part of Turkey have exceeded the air quality limits in winter months since several years. The region has major industrial plants including lignite-fired power plants and open-cast mining activities, residential areas, and traffic sources. To obtain and quantify the sector-wise anthropogenic emissions and spatial distribution of the major pollutants including SO2, NO x , PM10, and CO, a comprehensive emission inventory with 1-km spatial resolution was prepared for the year of 2014, and the AERMOD dispersion model was used to predict ambient air concentrations in a domain of 140 km by 110 km...
February 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28149382/10-km-running-performance-predicted-by-a-multiple-linear-regression-model-with-allometrically-adjusted-variables
#16
Cesar C C Abad, Ronaldo V Barros, Romulo Bertuzzi, João F L Gagliardi, Adriano E Lima-Silva, Mike I Lambert, Flavio O Pires
The aim of this study was to verify the power of VO2max, peak treadmill running velocity (PTV), and running economy (RE), unadjusted or allometrically adjusted, in predicting 10 km running performance. Eighteen male endurance runners performed: 1) an incremental test to exhaustion to determine VO2max and PTV; 2) a constant submaximal run at 12 km·h(-1) on an outdoor track for RE determination; and 3) a 10 km running race. Unadjusted (VO2max, PTV and RE) and adjusted variables (VO2max(0.72), PTV(0.72) and RE(0...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28146582/mechanical-alterations-associated-with-repeated-treadmill-sprinting-under-heat-stress
#17
Olivier Girard, Franck Brocherie, Jean-Benoit Morin, Sébastien Racinais, Grégoire P Millet, Julien D Périard
PURPOSE: Examine the mechanical alterations associated with repeated treadmill sprinting performed in HOT (38°C) and CON (25°C) conditions. METHODS: Eleven recreationally active males performed a 30-min warm-up followed by three sets of five 5-s sprints with 25-s recovery and 3-min between sets in each environment. Constant-velocity running for 1-min at 10 and 20 km.h-1 was also performed prior to and following sprinting. RESULTS: Mean skin (37...
2017: PloS One
https://www.readbyqxmd.com/read/28129518/body-mass-and-weekly-training-distance-influence-the-pain-and-injuries-experienced-by-runners-using-minimalist-shoes
#18
Joel T Fuller, Dominic Thewlis, Jonathan D Buckley, Nicholas A T Brown, Joseph Hamill, Margarita D Tsiros
BACKGROUND: Minimalist shoes have been popularized as a safe alternative to conventional running shoes. However, a paucity of research is available investigating the longer-term safety of minimalist shoes. PURPOSE: To compare running-related pain and injury between minimalist and conventional shoes in trained runners and to investigate interactions between shoe type, body mass, and weekly training distance. STUDY DESIGN: Randomized clinical trial; Level of evidence, 2...
January 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28121183/betalain-rich-concentrate-supplementation-improves-exercise-performance-and-recovery-in-competitive-triathletes
#19
RANDOMIZED CONTROLLED TRIAL
Cristhian F Montenegro, David A Kwong, Zev A Minow, Brian A Davis, Christina F Lozada, Gretchen A Casazza
We aimed to determine the effects of a betalain-rich concentrate (BRC) of beetroots, containing no sugars or nitrates, on exercise performance and recovery. Twenty-two (9 men and 13 women) triathletes (age, 38 ± 11 years) completed 2 double-blind, crossover, randomized trials (BRC and placebo) starting 7 days apart. Each trial was preceded by 6 days of supplementation with 100 mg·day(-1) of BRC or placebo. On the 7th day of supplementation, exercise trials commenced 120 min after ingestion of 50 mg BRC or placebo and consisted of 40 min of cycling (75 ± 5% maximal oxygen consumption) followed by a 10-km running time trial (TT)...
February 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28116878/effect-of-prior-warm-up-duration-on-the-determination-of-the-time-limit-at-the-peak-speed-in-untrained-men
#20
Victor H DA Cruz, Cecília S Peserico, Fabiana A Machado
BACKGROUND: The peak speed (Vpeak) and its time limit (tlim) are variables used to prescribe training loads and the intervals durations during interval training, respectively. The aim of this study was to test different warm-up durations (5, 10 and 15 min), adapted from the protocol proposed by Billat et al.1, to determine the tlim in untrained men. METHODS: Fifteen untrained men were submitted to the following laboratory evaluations: A) an incremental running exercise test on a treadmill running starting with a speed of 8 km·h-1, after a warm-up of walking at 6 km·h-1 for three minutes, and increased by 1 km·h-1 between each successive 3-minute stage until volitional exhaustion to determine Vpeak; B) three rectangular tests, performed in randomized order, with warm-up durations of 5, 10, and 15 minutes at 60% of Vpeak to determine the tlim5, tlim10 e and tlim15; after the warm-up the tests were performed at the speed of the individual Vpeak until volitional exhaustion...
January 23, 2017: Journal of Sports Medicine and Physical Fitness
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