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https://www.readbyqxmd.com/read/29141506/triathlon-transition-study-quantifying-differences-in-running-movement-pattern-and-precision-after-bike-run-transition
#1
Christian Weich, Randall L Jensen, Manfred Vieten
Various publications discuss the discrepancies of running in triathlons and stand-alone runs. However, those methods, such as analysing step-characteristics or ground-contact time, lack the ability to quantitatively discriminate between subtle running differences. The attractor method can be applied to overcome those shortcomings. The purpose was to detect differences in athletes' running patterns (δM) and movement precision (δD) by comparing a 5,000 m run after a prior cycling session (TRun) with an isolated run over the same distance (IRun)...
November 15, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#2
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29113535/effects-of-erythropoietin-abuse-on-exercise-performance
#3
Paolo Sgrò, Massimiliano Sansone, Andrea Sansone, Francesco Romanelli, Luigi Di Luigi
The present review provides a comprehensive overview on the erythropoietic and non-erythropoietic effects of rHuEpo on human sport performance, paying attention to quantifying numerically how rHuEpo affects exercise performance and describing physiological changes regarding the most important exercise variables. Much attention has been paid to treatment schedules, in particular, to assess the effects of microdoses of rHuEpo and the prolonged effects on sport performance following withdrawal. Moreover, the review takes into account non-erythropoietic ergogenic effects of rHuEpo, including cognitive benefits of rHuEpo...
November 8, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29112625/ischemic-preconditioning-improves-time-trial-performance-at-moderate-altitude
#4
Pénélope Paradis-Deschênes, Denis R Joanisse, François Billaut
PURPOSE: Endurance athletes often compete and train at altitude where exercise capacity is reduced. Investigating acclimation strategies is therefore critical. Ischemic preconditioning (IPC) can improve endurance performance at sea level through improved O2 delivery and utilization, which could also prove beneficial at altitude. However, data are scarce and there is no study at altitudes commonly visited by endurance athletes. METHODS: In a randomized, crossover study, we investigated performance and physiological responses in thirteen male endurance cyclists during four 5-km cycling time trials (TT), preceded by either IPC (3x5-minutes ischemia/5-minutes reperfusion cycles at 220 mmHg) or SHAM (20 mmHg) administered to both thighs, at simulated low (FIO2 0...
November 6, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29050040/maximal-fat-oxidation-is-related-to-performance-in-an-ironman-triathlon
#5
Jacob Frandsen, Stine Dahl Vest, Steen Larsen, Flemming Dela, Jørn W Helge
The aim of the present study was to investigate the relationship between maximal fat oxidation rate (MFO) measured during a progressive exercise test on a cycle ergometer and ultra-endurance performance. 61 male ironman athletes (age: 35±1 yrs. [23-47 yrs.], with a BMI of 23.6±0.3 kg/m(2) [20.0-30.1 kg/m(2)], a body fat percentage of 16.7±0.7% [8.4-30.7%] and a VO2peak of 58.7±0.7 ml/min/kg [43.9-72.5 ml/min/kg] SEM [Range]) were tested in the laboratory between 25 and 4 days prior to the ultra-endurance event, 2016 Ironman Copenhagen...
October 19, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29033847/a-monetary-reward-alters-pacing-but-not-performance-in-competitive-cyclists
#6
Sabrina Skorski, Kevin G Thompson, Richard J Keegan, Tim Meyer, Chris R Abbiss
Money has frequently been used as an extrinsic motivator since it is assumed that humans are willing to invest more effort for financial reward. However, the influence of a monetary reward on pacing and performance in trained athletes is not well-understood. Therefore, the aim of this study was to analyse the influence of a monetary reward in well-trained cyclists on their pacing and performance during short and long cycling time trials (TT). Twentythree cyclists (6 ♀, 17 ♂) completed 4 self-paced time trials (TTs, 2 short: 4 km and 6 min; 2 long: 20 km and 30 min); in a randomized order...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29032729/impact-of-inserted-long-rest-periods-during-repeated-sprint-exercise-on-performance-adaptation
#7
Akiho Ikutomo, Nobukazu Kasai, Kazushige Goto
Repeated sprint training consists of a series of brief maximal sprints, 3-7 s in duration, separated by short rest periods of <60 s. However, little is known about the influence of different rest period lengths between sprints on performance adaptation. We determined the influence of inserting long rest periods during repeated sprint training on performance adaptation in competitive athletes. Twenty-one well-trained athletes were separated into either the short rest period group (SHORT; n = 10) or the long rest period group (LONG; n = 11)...
October 14, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29016234/limited-evidence-suggests-a-protective-association-between-oral-contraceptive-pill-use-and-anterior-cruciate-ligament-injuries-in-females-a-systematic-review
#8
Kathleen Samuelson, Ethan M Balk, Erika L Sevetson, Braden C Fleming
CONTEXT: Female athletes aged 14 to 18 years are at particular risk for anterior cruciate ligament (ACL) injuries. Hormonal factors are thought to predispose them to this injury. Oral contraceptive pills (OCPs) might reduce ACL injury risk, although the literature appears controversial. OBJECTIVE: To evaluate the association between OCP use and ACL injuries in women. The secondary objective was to determine the rates of ACL injuries in the pre- and postovulatory phases of the menstrual cycle in OCP and non-OCP (NOCP) users...
November 2017: Sports Health
https://www.readbyqxmd.com/read/28993881/maximal-rate-of-heart-rate-increase-correlates-with-fatigue-recovery-status-in-female-cyclists
#9
Maximillian J Nelson, Clint R Bellenger, Rebecca L Thomson, Eileen Y Robertson, Kade Davison, Daniela Schäfer Olstad, Jonathan D Buckley
PURPOSE: Being able to identify how an athlete is responding to training would be useful to optimise adaptation and performance. The maximal rate of heart rate increase (rHRI), a marker of heart rate acceleration has been shown to correlate with performance changes in response to changes in training load in male athletes; however, it has not been established if it also correlates with performance changes in female athletes. METHODS: rHRI and cycling performance were assessed in six female cyclists following 7 days of light training (LT), 14 days of heavy training (HT) and a 10 day taper period...
October 9, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28980321/post-exercise-recovery-of-contractile-function-and-endurance-in-humans-and-mice-is-accelerated-by-heating-and-slowed-by-cooling-skeletal-muscle
#10
Arthur J Cheng, Sarah J Willis, Christoph Zinner, Thomas Chaillou, Niklas Ivarsson, Niels Ørtenblad, Johanna T Lanner, Hans-Christer Holmberg, Håkan Westerblad
Manipulation of muscle temperature is believed to improve post-exercise recovery, with cooling being especially popular among athletes. However, it is unclear whether such temperature manipulations actually have positive effects. Accordingly, we studied the effect of muscle temperature on the acute recovery of force and fatigue resistance after endurance exercise. One hour of moderate-intensity arm cycling exercise in humans was followed by two hours recovery in which the upper arms were either heated to 38°C, not treated (33°C), or cooled to ∼15°C...
October 4, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28958144/assessment-of-pn-gal-as-a-marker-of-renal-function-in-elite-cyclists-during-professional-competitions
#11
A Andreazzoli, C Fossati, A Spaccamiglio, R Salvo, F Quaranta, C Minganti, L Di Luigi, P Borrione
Glomerular filtration rate (GFR) has been shown to be lower than physiological values during exercise with a strong negative correlation with exercise intensity. Among new markers of renal function, neutrophil gelatinase-associated lipocalin (NGAL) seems to be very promising. It is an early, sensitive and specific marker of acute kidney injury (AKI) with two isoforms: plasma NGAL (pNGAL) and urinary NGAL (uNGAL). The aim of the present study was to assess acute variations in NGAL plasma levels after performing high endurance physical exercise in a group of professional cyclists during the two major European professional cycling competitions (Giro D’Italia and Tour de France)...
July 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28952837/training-intensity-distribution-over-a-four-year-cycle-in-olympic-champion-rowers-different-roads-lead-to-rio
#12
Daniel J Plews, Paul B Laursen
The purpose of this study was to compare the training intensity distribution (TID) of the undefeated world champion male rowing New Zealand (kiwi) pair over a four-year Olympic cycle, across training phases, training years, and between individuals. Training data, including heart rate and boat speed, were recorded in the athletes rowing in the same boat between March 2013 and August 2016, ending with the Rio Olympics final. Progressive exercise tests assessed first (LT1) and second (LT2) lactate thresholds and associated heart rates, to determine the percentage of training performed below, between and above these demarcation points...
September 27, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28940670/deoxygenation-of-inspiratory-muscles-during-cycling-hyperpnoea-and-loaded-breathing-in-health-and-disease-a-systematic-review
#13
REVIEW
Takako Tanaka, Nada Basoudan, Luana T Melo, Lisa Wickerson, Laurent J Brochard, Ewan C Goligher, W Darlene Reid
Assessing inspiratory muscle deoxygenation and blood flow can provide insight into anaerobic stress, recruitment strategies and mechanisms of inspiratory muscle limitation. Therefore, this review aimed to synthesize measurements of inspiratory muscle oxyhaemoglobin (O2 Hb), deoxyhaemoglobin (HHb), blood volume and flow of the inspiratory muscles acquired via near-infrared spectroscopy (NIRS) during cycling, hyperpnoea and loaded breathing in healthy non-athletes, healthy athletes and patients with chronic obstructive pulmonary disease (COPD) or chronic heart failure (CHF)...
September 22, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28936625/the-reproducibility-of-4-km-time-trial-tt-performance-following-individualised-sodium-bicarbonate-supplementation-a-randomised-controlled-trial-in-trained-cyclists
#14
Lewis Anthony Gough, Sanjoy Kumar Deb, Andy Sparks, Lars Robert McNaughton
BACKGROUND: Individual time to peak blood bicarbonate (HCO3(-)) has demonstrated good to excellent reproducibility following ingestion of both 0.2 g kg(-1) body mass (BM) and 0.3 g kg(-1) BM sodium bicarbonate (NaHCO3), but the consistency of the time trial (TT) performance response using such an individualised NaHCO3 ingestion strategy remains unknown. This study therefore evaluated the reproducibility of 4-km TT performance following NaHCO3 ingestion individualised to time to peak blood bicarbonate...
September 21, 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28930879/repeat-effort-performance-is-reduced-24-h-following-acute-dehydration-in-mixed-martial-arts-athletes
#15
Oliver R Barley, Fiona Iredale, Dale W Chapman, Amanda Hopper, Chris Abbiss
This study sought to determine the influence of acute dehydration on physical performance and physiology in Mixed Martial Arts (MMA). MMA athletes (n=14; age: 23±4 years), completed in a randomised counterbalanced order a dehydration protocol, (DHY: 3 h cycling at 60 W in 40°C to induce 5% dehydration) or thermoneutral control (25°C: CONT) exercise, followed by ad libitum fluid/food intake. Performance testing (a repeat sled push test, medicine ball chest throw and vertical jump) was completed 3 and 24 h following the intervention, while urine and blood samples were collected before, 20 min, 3 and 24 h following the intervention...
September 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28902115/repeated-high-intensity-cycling-performance-is-unaffected-by-timing-of-carbohydrate-ingestion
#16
Ren-Jay Shei, Hunter L Paris, Christopher P Beck, Robert F Chapman, Timothy D Mickleborough
To determine whether carbohydrate feeding taken immediately before, early, or late in a series of high-intensity cycling exercises affected cycling performance 16 trained, male cyclists (> 6hr post-prandial) performed three, 4-km cycling time trials (TT1, TT2, TT3) separated by 15 min of active recovery on four separate occasions. Carbohydrate feeding (80g) was given either before TT1 (PRE1), before TT2 (PRE2), before TT3 (PRE3), or not at all (control, CTL). Treatment order was randomized. Sweet-placebo was given prior to the other time trials...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28895388/probiotic-strains-as-the-element-of-nutritional-profile-in-physical-activity-%C3%A2-new-trend-or-better-sports-results
#17
REVIEW
Joanna Smarkusz, Lucyna Ostrowska, Katarzyna Witczak-Sawczuk
A diet, individually customized to the needs of sportsmen and sportswomen prepares them better for competition and achievement of better sports results. However, disorders of the gastrointestinal tract and frequently recurrent upper respiratory tract infections pose a common problem observed among athletes of disciplines such as triathlon, cycling and marathon. Diarrhea, splashing in the intestines or gastrointestinal bleeding make it difficult to start and win in the race. Recently researchers have paid special attention to the therapeutic effect of probiotic strains on the human body...
2017: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/28894645/re-examination-of-the-contribution-of-substrates-to-energy-expenditure-during-high-intensity-intermittent-exercise-in-endurance-athletes
#18
Zübeyde Aslankeser, Şükrü Serdar Balcı
BACKGROUND: It has been believed that the contribution of fat oxidation to total energy expenditure is becoming negligible at higher exercise intensities (about 85% VO2max). The aim of the present study was to examine the changes in substrate oxidation during high-intensity interval exercise in young adult men. METHODS: A total of 18 healthy well-trained (aged 19.60 ± 0.54 years, BMI = 22.19 ± 0.64 kg/m(2), n = 10) and untrained (aged 20.25 ± 0.41 years, BMI = 22...
2017: PeerJ
https://www.readbyqxmd.com/read/28872385/new-records-in-human-power
#19
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/28872383/weight-management-practices-of-australian-olympic-combat-sport-athletes
#20
Reid Reale, Gary Slater, Louise M Burke
PURPOSE: Combat sport athletes undertake chronic and rapid weight loss (RWL) practices to qualify for weight divisions lower than their training weight. Variation between sports in the prevalence, methods, and magnitude of weight loss as well as recovery practices may be influenced by factors including competition level and culture. Differences in methodologies of previous research in combat sports make direct comparisons difficult, thus this study aimed to examine weight loss practices among all Olympic combat sports in Australia, using standardised methodology...
September 5, 2017: International Journal of Sports Physiology and Performance
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