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https://www.readbyqxmd.com/read/29651253/a-lactate-kinetics-method-for-assessing-the-maximal-lactate-steady-state-workload
#1
Gernot O Hering, Ewald M Hennig, Hartmut J Riehle, Jens Stepan
During a continuously increasing exercise workload (WL) a point will be reached at which arterial lactate accumulates rapidly. This so-called lactate threshold (LT) is associated with the maximal lactate steady state workload (MLSSW ), the highest WL, at which arterial lactate concentration [LA] does not change. However, the physiological range in which the LT and the MLSSW occur has not been demonstrated directly. We used minor WL variations in the MLSSW range to assess arterial lactate kinetics in 278 treadmill and 148 bicycle ergometer exercise tests...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29616228/modeling-the-effects-of-duration-and-size-of-the-control-zones-on-the-consequences-of-a-hypothetical-african-swine-fever-epidemic-in-denmark
#2
Tariq Halasa, Anette Bøtner, Sten Mortensen, Hanne Christensen, Sisse Birk Wulff, Anette Boklund
African swine fever (ASF) is a notifiable infectious disease. The disease is endemic in certain regions in Eastern Europe constituting a risk of ASF spread toward Western Europe. Therefore, as part of contingency planning, it is important to continuously explore strategies that can effectively control an epidemic of ASF. A previously published and well documented simulation model for ASF virus spread between herds was used to examine the epidemiologic and economic impacts of the duration and size of the control zones around affected herds...
2018: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29599865/effect-of-compression-garments-on-physiological-responses-after-uphill-running
#3
Ivan Struhár, Michal Kumstát, Dagmar Moc Králová
Limited practical recommendations related to wearing compression garments for athletes can be drawn from the literature at the present time. We aimed to identify the effects of compression garments on physiological and perceptual measures of performance and recovery after uphill running with different pressure and distributions of applied compression. In a random, double blinded study, 10 trained male runners undertook three 8 km treadmill runs at a 6% elevation rate, with the intensity of 75% VO2max while wearing low, medium grade compression garments and high reverse grade compression...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599725/validity-and-reliability-of-10-hz-global-positioning-system-to-assess-in-line-movement-and-change-of-direction
#4
Pantelis T Nikolaidis, Filipe M Clemente, Cornelis M I van der Linden, Thomas Rosemann, Beat Knechtle
The objectives of the present study were to examine the validity and reliability of the 10 Hz Johan GPS unit in assessing in-line movement and change of direction. The validity was tested against the criterion measure of 200 m track-and-field (track-and-field athletes, n = 8) and 20 m shuttle run endurance test (female soccer players, n = 20). Intra-unit and inter-unit reliability was tested by intra-class correlation coefficient (ICC) and coefficient of variation (CV), respectively. An analysis of variance examined differences between the GPS measurement and five laps of 200 m at 15 km/h, and t -test examined differences between the GPS measurement and 20 m shuttle run endurance test...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29594355/high-intensity-intermittent-5-10-15-running-reduces-body-fat-and-increases-lean-body-mass-bone-mineral-density-and-performance-in-untrained-subjects
#5
Tanja Ravnholt, Jonas Tybirk, Niklas Rye Jørgensen, Jens Bangsbo
The present study examined the effect of intense intermittent running with 5 s sprints on body composition, fitness level, and performance in untrained subjects aged 36-53 years. For 7 weeks, the subjects carried out 3 days a week 5-10-15 training consisting of 3-9 blocks of 4 repetitions of 15, 10, and 5 s low-, moderate-, and high-speed running, respectively. Body fat mass was 4.3% lower (P < 0.01), and lean body mass and bone mineral density was 1.1 and 0.9% higher (P < 0.01), respectively, after compared to before the intervention period (INT)...
March 29, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29589407/validity-and-reliability-of-an-inertial-device-wimu-protm-to-quantify-physical-activity-level-through-steps-measurement
#6
Alejandro Hernández-Belmonte, Alejandro Bastida-Castillo, Carlos D Gómez-Carmona, José Pino-Ortega
BACKGROUND: Currently, there is an increase in the application of accelerometers to quantify physical activity level through daily steps, and therefore, it is required that the devices are valid and reliable. The current study tested (i) the validity of the WIMU PROTM inertial device in steps detection and (ii) the inter-device reliability for steps measurement. METHODS: Ten endurance-trained men volunteered to participate in this study (height: 1.78 ± 0.05 m; body mass: 72...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29561245/the-efficacy-of-downhill-running-as-a-method-to-enhance-running-economy-in-trained-distance-runners
#7
Andrew J Shaw, Stephen A Ingham, Jonathan P Folland
Running downhill, in comparison to running on the flat, appears to involve an exaggerated stretch-shortening cycle (SSC) due to greater impact loads and higher vertical velocity on landing, whilst also incurring a lower metabolic cost. Therefore, downhill running could facilitate higher volumes of training at higher speeds whilst performing an exaggerated SSC, potentially inducing favourable adaptations in running mechanics and running economy (RE). This investigation assessed the efficacy of a supplementary 8-week programme of downhill running as a means of enhancing RE in well-trained distance runners...
March 21, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29558239/variation-of-traditional-biomarkers-of-liver-injury-after-an-ultramarathon-at-altitude
#8
Jill N Tirabassi, Lucianne Olewinski, Morteza Khodaee
BACKGROUND: Significant elevations of traditional biomarkers of liver injury can occur as a result of running an ultramarathon. HYPOTHESIS: Traditional serum biomarker levels of liver injury will significantly increase as the result of participating in this 161-km race at altitude. STUDY DESIGN: Prospective cross-sectional study. LEVEL OF EVIDENCE: Level 3. METHODS: A total of 64 (before) and 83 (after) volunteer runners participated in a prospective observational field-based study at the Leadville 100 ultramarathon race...
March 1, 2018: Sports Health
https://www.readbyqxmd.com/read/29550786/quantification-of-energy-expenditure-of-military-loaded-runs-what-is-the-performance-of-laboratory-based-equations-when-applied-to-the-field-environment
#9
Alessandro L Colosio, S Pogliaghi
INTRODUCTION: Performance during army loaded runs provides a synthetic indicator of a soldier's capacity to move while carrying loads and thereby remain able to execute a mission. The aim of this study was to estimate and compare the energy expenditure (EE) of army loaded runs, conducted in a field environment using laboratory-based equations and HR index (HRindex ). METHODS: 45 Ranger recruits had HR monitored during three loaded runs (10, 15 and 20 km) in full military equipment in the field environment...
March 17, 2018: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/29478668/design-of-sports-clothing-for-hot-environments
#10
R Varadaraju, J Srinivasan
The clothing design based on sweat distribution pattern is called as body mapping clothing. Comparisons of three designs of body mapped and one conventional design of T-shirt was done in a wearer testing at a controlled chamber of 33 °C and 60% relativity humidity in a treadmill at 12 km/h for 40 min followed by 10 min resting. It is concluded that with the full body mapped T-shirt the increase in skin temperature is reduced in the chest area, shoulder, the body back by 47%,44% and 55% respectively; the increase in skin micro climate relative humidity is reduced in the chest area, shoulder, the body back by 54%,39...
February 22, 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29475209/perceptually-regulated-exercise-test-allows-determination-of-v%C3%AB-o2max-and-ventilatory-threshold-but-not-respiratory-compensation-point-in-trained-runners
#11
Perrine Truong, Gregoire P Millet, Boris Gojanovic
This study aimed to investigate the differences in maximal oxygen uptake (V̇O2max ) and submaximal thresholds between a standard graded exercise test (GXT) and a perceptually regulated graded exercise test (PRGXT) in trained runners. Eleven well-trained middle- to long-distance runners performed both tests in a randomized order. PRGXT used incremental "clamps" of rating of perceived exertion (RPE) over 10×1-min stages on an automated treadmill equipped with a sonar sensor allowing them to change their running speed instantly and in a natural way...
February 23, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29466267/effects-of-sprint-interval-training-with-active-recovery-vs-endurance-training-on-aerobic-and-anaerobic-power-muscular-strength-and-sprint-ability
#12
Bülent Sökmen, Ronald L Witchey, Gene M Adams, William C Beam
Sökmen, B, Witchey, RL, Adams, GM, and Beam, WC. Effects of sprint interval training with active recovery vs. endurance training on aerobic and anaerobic power, muscular strength, and sprint ability. J Strength Cond Res 32(3): 624-631, 2018-This study compared sprint interval training with active recovery (SITAR) to moderate-intensity endurance training (ET) in aerobic and anaerobic power, muscular strength, and sprint time results. Forty-two recreationally active adults were randomly assigned to a SITAR or ET group...
March 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29431556/the-fit-matters-influence-of-accelerometer-fitting-and-training-drill-demands-on-load-measures-in-rugby-league-players
#13
Blake D McLean, Cloe Cummins, Greta Conlan, Grant Duthie, Aaron J Coutts
PURPOSE: Determine the relationship between drill type and accelerometer-derived loads during various team sport activities, and examine the influence of unit fitting on these loads. METHODS: Sixteen rugby league players were fitted with microtechnology devices in either manufacturer vests or playing jerseys before completing standardised running, agility and tackling drills. Two-dimensional (2D) and three-dimensional (3D) accelerometer loads (BodyLoadTM) per km were compared across drills and fittings (i...
February 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29417745/effect-of-speed-endurance-training-and-reduced-training-volume-on-running-economy-and-single-muscle-fiber-adaptations-in-trained-runners
#14
Casper Skovgaard, Danny Christiansen, Peter M Christensen, Nicki W Almquist, Martin Thomassen, Jens Bangsbo
The aim of the present study was to examine whether improved running economy with a period of speed endurance training and reduced training volume could be related to adaptations in specific muscle fibers. Twenty trained male (n = 14) and female (n = 6) runners (maximum oxygen consumption (VO2 -max): 56.4 ± 4.6 mL/min/kg) completed a 40-day intervention with 10 sessions of speed endurance training (5-10 × 30-sec maximal running) and a reduced (36%) volume of training. Before and after the intervention, a muscle biopsy was obtained at rest, and an incremental running test to exhaustion was performed...
February 2018: Physiological Reports
https://www.readbyqxmd.com/read/29389321/attenuated-total-reflectance-fourier-transformation-infrared-spectroscopy-fingerprinted-online-monitoring-of-the-kinetics-of-circulating-butyrylcholinesterase-enzyme-during-metabolism-of-bambuterol
#15
Sherif M Eid, Mohamed K Abd El-Rahman, Mohamed R Elghobashy, Khadiga M Kelani
We have described a continuous flow ATR-FTIR method for measuring some of the Butyrylcholinesterase enzyme kinetics (Km and Vmax). This is done by developing a circulating system to be close as much as possible to the human circulation using human serum as a source of the enzyme with adjusted pH, isotonicity and temperature to give the maximum affinity of the enzyme towards its substrate (bambuterol). The experiment was running continuously for 90 min to monitor the production of terbutaline from the zero time of its appearance with a measured spectrum in each minute using ZnSe prism...
April 16, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29364063/impact-of-carbohydrate-mouth-rinsing-on-time-to-exhaustion-during-ramadan-a-randomized-controlled-trial-in-jordanian-men
#16
Mo'ath F Bataineh, Ali M Al-Nawaiseh, Mohammad H Abu Altaieb, David M Bellar, Omar S Hindawi, Lawrence W Judge
Mouth rinsing using a carbohydrate (CHO) solution has been suggested to improve physical performance in fasting participants. This study examined the effects of CHO mouth rinsing during Ramadan fasting on running time to exhaustion and on peak treadmill speed (Vpeak). In a counterbalanced crossover design, 18 sub-elite male runners (Age: 21 ± 2 years, Weight: 68.1 ± 5.7 kg, VO2max: 55.4 ± 4.8 ml/kg/min) who observed Ramadan completed a familiarization trial and three experimental trials. The three trials included rinsing and expectorating a 25 mL bolus of either a 7...
January 24, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29334675/effects-of-running-retraining-on-biomechanical-factors-associated-with-lower-limb-injury
#17
Marcus D Dunn, David B Claxton, Graham Fletcher, Jonathan S Wheat, David M Binney
Injury risk is an important concern for runners; however, limited evidence exists regarding changes to injury risk following running style retraining. Biomechanical factors, such as absolute peak free moment, knee abduction impulse, peak foot eversion and foot eversion excursion, have been shown to predict lower limb injury. The aim of this study was to assess the effects of Pose running retraining on biomechanical factors associated with lower limb running injury. Twenty uninjured recreational runners were pair-matched based on their five km run time performance and randomly assigned to control (n = 10) and intervention (three 2-h Pose running retraining sessions) groups (n = 10)...
April 2018: Human Movement Science
https://www.readbyqxmd.com/read/29325455/influence-of-middle-distance-running-on-muscular-micro-rnas
#18
Elisa Danese, Marco Benati, Fabian Sanchis-Gomar, Cantor Tarperi, Gian Luca Salvagno, Elisa Paviati, Martina Montagnana, Federico Schena, Giuseppe Lippi
A specific subset of micro RNAs (miRs), including miR-133 and miR-206, is specifically expressed in muscle tissue, so that they are currently defined as muscular miRs (myomiRs). To further elucidate the role of myomiRs in muscle biology, we measured miR-133a and miR-206 in plasma of 28 middle-age recreational athletes. The study population consisted of 28 middle aged, recreation athletes (11 women and 17 men; mean age, 46 years) who completed a 21.1 km, half-marathon. The plasma concentration of miR-133a and miR-206, the serum concentration of creatine kinase (CK) and high-sensitivity (HS) cardiac troponin T (cTnT), as well as capillary lactate, were measured before and immediately after the run...
May 2018: Scandinavian Journal of Clinical and Laboratory Investigation
https://www.readbyqxmd.com/read/29288436/the-relationships-between-internal-and-external-measures-of-training-load-and-intensity-in-team-sports-a-meta-analysis
#19
REVIEW
Shaun J McLaren, Tom W Macpherson, Aaron J Coutts, Christopher Hurst, Iain R Spears, Matthew Weston
BACKGROUND: The associations between internal and external measures of training load and intensity are important in understanding the training process and the validity of specific internal measures. OBJECTIVES: We aimed to provide meta-analytic estimates of the relationships, as determined by a correlation coefficient, between internal and external measures of load and intensity during team-sport training and competition. A further aim was to examine the moderating effects of training mode on these relationships...
March 2018: Sports Medicine
https://www.readbyqxmd.com/read/29276853/are-habitual-runners-physically-inactive
#20
Timo Rantalainen, Arto J Pesola, Matthew Quittner, Nicola D Ridgers, Daniel L Belavy
The World Health Organisation's (WHO) physical activity guidelines recommend 150min/week of moderate- to vigorous-intensity physical activity (MVPA) accumulated in 10 min bouts. To see whether people performing habitual exercise for recreation meet these guidelines, 25 long-distance runners [mean 67 km/wk], 25 joggers [mean 28 km/wk], and 20 sedentary adults wore an ActiGraph GT3X+ accelerometer for 7 days. Sedentary time and bouts were similar in runners and sedentary adults (p > 0.46). Sedentary adults performed 20 ± 16 min/day of MVPA (usual bout duration (W50%): 9...
December 25, 2017: Journal of Sports Sciences
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