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https://www.readbyqxmd.com/read/29777386/substrate-metabolism-during-ironman-triathlon-different-horses-on-the-same-courses
#1
Ed Maunder, Andrew E Kilding, Daniel J Plews
Ironman triathlons are ultra-endurance events of extreme duration. The performance level of those competing varies dramatically, with elite competitors finishing in ~ 8:00:00, and lower performing amateurs finishing in ~ 14-15:00:00. When applying appropriate values for swimming, cycling and running economies to these performance times, it is demonstrated that the absolute energy cost of these events is high, and the rate of energy expenditure increases in proportion with the athlete's competitive level...
May 18, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29758055/active-recovery-affects-the-recovery-of-the-corticospinal-system-but-not-of-muscle-contractile-properties
#2
Louis-Solal Giboin, Ehsan Amiri, Raphael Bertschinger, Markus Gruber
PURPOSE: Active recovery is often used by athletes after strenuous exercise or competition but its underlying mechanisms are not well understood. We hypothesized that active recovery speeds-up recovery processes within the muscle and the central nervous system (CNS). METHODS: We assessed muscular and CNS recovery by measuring the voluntary activation (VA) in the vastus lateralis muscle with transcranial magnetic stimulation (VATMS) and peripheral nerve stimulation (VAPNS) during maximal voluntary contractions (MVC) of the knee extensors in 11 subjects...
2018: PloS One
https://www.readbyqxmd.com/read/29745784/short-term-effects-of-rolling-massage-on-energy-cost-of-running-and-power-of-the-lower-limbs
#3
Nicola Giovanelli, Filippo Vaccari, Mirco Floreani, Enrico Rejc, Jasmine Copetti, Marco Garra, Lea Biasutti, Stefano Lazzer
PURPOSE: Self-myofascial release (SMFR) is a type of self-massage that is becoming popular among athletes. However, SMFR effects on running performance have not been investigated yet. The aim of the present study was to evaluate the effects of SMFR on cost of running (Cr). In addition, we evaluated the effects of SMFR on lower limbs muscle power. METHODS: The measurement of Cr and lower limb muscle power during squat jump (SJ) and counter movement jump (CMJ) were performed before (PRE), immediately after (POST) and 3hours after (POST 3h) a SMFR protocol (experimental condition)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29745735/time-trial-performance-in-elite-speed-skaters-after-remote-ischemic-preconditioning
#4
Philippe Richard, François Billaut
PURPOSE: Speed skating leads to blood-flow restriction and deoxygenation in the lower limbs (especially the right leg) that may affect performance. Although the acute influence of such deoxygenation is not clearly understood, we tested whether remote ischemic preconditioning (RIPC) could modify muscular oxygenation and improve time-trial performance in that sport. METHODS: Using a randomized, single-blind, placebo-controlled, crossover design, 9 elite speed skaters performed 1000-m on-ice time-trials preceded by either RIPC of the upper limbs (3x5-min compression/5-min reperfusion cycles at 30 mmHg > arterial systolic pressure) or SHAM (10 mmHg)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29743827/the-effect-of-carbohydrate-mouth-rinse-on-performance-biochemical-and-psychophysiological-variables-during-a-cycling-time-trial-a-crossover-randomized-trial
#5
Amanda M J Ferreira, Luiz F Farias-Junior, Thaynan A A Mota, Hassan M Elsangedy, Aline Marcadenti, Telma M A M Lemos, Alexandre H Okano, Ana P T Fayh
Background: The hypothesis of the central effect of carbohydrate mouth rinse (CMR) on performance improvement in a fed state has not been established, and its psychophysiological responses have not yet been described. The aim of this study was to evaluate the effect of CMR in athletes fed state on performance, biochemical and psychophysiological responses compared to ad libitum water intake. Methods: Eleven trained male cyclists completed a randomized, crossover trial, which consisted of a 30 km cycle ergometer at self-selected intensity and in a fed state...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29721606/the-effects-of-different-durations-of-static-stretching-within-a-comprehensive-warm-up-on-voluntary-and-evoked-contractile-properties
#6
Jonathan C Reid, Rebecca Greene, James D Young, Daniel D Hodgson, Anthony J Blazevich, David G Behm
Evidence for performance decrements following prolonged static stretching (SS) has led to a paradigm shift in stretching routines within a warm-up. Rather than SS, dynamic stretching (DS) and dynamic activity (DA) have replaced SS within warm-up routines. The objective of the present study was to compare the effect of differing lower limb SS durations (30 [SS30s], 60 [SS60s] or 120 s [SS120s] of SS per muscle group or no-stretch control) within a comprehensive warm-up protocol consisting of aerobic activity, DS and DA...
May 2, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29720479/scientific-rationale-for-changing-lower-water-temperature-limits-for-triathlon-racing-to-12%C3%A2-c-with-wetsuits-and-16%C3%A2-c-without-wetsuits
#7
Jane Saycell, Mitch Lomax, Heather Massey, Mike Tipton
OBJECTIVES: To provide a scientific rationale for lower water temperature and wetsuit rules for elite and subelite triathletes. METHODS: 11 lean, competitive triathletes completed a 20 min flume swim, technical transition including bike control and psychomotor testing and a cycle across five different wetsuit and water temperature conditions: with wetsuit: 10°C, 12°C and 14°C; without wetsuit (skins): 14°C and 16°C. Deep body (rectal) temperature (Tre ), psychomotor performance and the ability to complete a technical bike course after the swim were measured, as well as swimming and cycling performance...
May 2, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29707541/personalized-hydration-strategy-attenuates-the-rise-in-heart-rate-and-in-skin-temperature-without-altering-cycling-capacity-in-the-heat
#8
Denise de Melo-Marins, Ana Angélica Souza-Silva, Gabriel Lucas Leite da Silva-Santos, Francisco de Assis Freire-Júnior, Jason Kai Wei Lee, Orlando Laitano
The optimal hydration plan [i.e., drink to thirst, ad libitum (ADL), or personalized plan] to be adopted during exercise in recreational athletes has recently been a matter of debate and, due to conflicting results, consensus does not exist. In the present investigation, we tested whether a personalized hydration strategy based on sweat rate would affect cardiovascular and thermoregulatory responses and exercise capacity in the heat. Eleven recreational male cyclists underwent two familiarization cycling sessions in the heat (34°C, 40% RH) where sweat rate was also determined...
2018: Frontiers in Nutrition
https://www.readbyqxmd.com/read/29674008/applying-systems-ergonomics-methods-in-sport-a-systematic-review
#9
Adam Hulme, Jason Thompson, Katherine L Plant, Gemma J M Read, Scott Mclean, Amanda Clacy, Paul M Salmon
INTRODUCTION: As sports systems become increasingly more complex, competitive, and technology-centric, there is a greater need for systems ergonomics methods to consider the performance, health, and safety of athletes in context with the wider settings in which they operate. Therefore, the purpose of this systematic review was to identify and critically evaluate studies which have applied a systems ergonomics research approach in the context of sports performance and injury management...
April 16, 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29658807/effect-of-bright-light-therapy-on-delayed-sleep-wake-cycle-and-reaction-time-of-athletes-participating-in-the-rio-2016-olympic-games
#10
João Paulo P Rosa, Andressa Silva, Dayane F Rodrigues, Mário Antônio Simim, Fernanda V Narciso, Sergio Tufik, Jorge J Bichara, Sebastian Rafael D Pereira, Sidney C Da Silva, Marco Tulio de Mello
This study investigated the effect of using an artificial bright light on the entrainment of the sleep/wake cycle as well as the reaction times of athletes before the Rio 2016 Olympic Games. A total of 22 athletes from the Brazilian Olympic Swimming Team were evaluated, with the aim of preparing them to compete at a time when they would normally be about to go to bed for the night. During the 8-day acclimatization period, their sleep/wake cycles were assessed by actigraphy, with all the athletes being treated with artificial light therapy for between 30 and 45 min (starting at day 3)...
April 16, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29658533/accelerometer-profile-of-motion-of-the-pelvic-girdle-in-butterfly-swimming
#11
Zbigniew Staniak, Krzysztof Buśko, Michał Górski, Anna Pastuszak
PURPOSE: The aim of the study was to develop a method to measure and analyse kinematics of movement of the pelvic girdle in butterfly swimming in order to support training of technical skills. METHODS: A device for recording triaxial accelerations and triaxial rotational angular velocities was mounted on the dorsal part of the pelvic girdle of athlete. The measurements were performed in ten elite butterfly swimmers (age: 23.1 ± 3.7 years, body height: 187.6 ± 4...
2018: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29651858/sleep-related-issues-for-recovery-and-performance-in-athletes
#12
Sarah Kölling, Rob Duffield, Daniel Erlacher, Ranel Venter, Shona L Halson
The body of research that reports the relevance of sleep in high-performance sports is growing steadily. While the identification of sleep cycles and diagnosis of sleep disorders is limited to lab-based assessment via polysomnography, the development of activity-based devices estimating sleep patterns provides greater insight into the sleep behaviour of athletes in ecological settings. Overall, small sleep quantity and/or poor quality appears to exist in many athletic populations, though this may be related to training and competition context...
April 13, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29619799/low-carbohydrate-ketogenic-diet-impairs-anaerobic-exercise-performance-in-exercise-trained-women-and-men-a-randomized-sequence-crossover-trial
#13
Kymberly A Wroble, Morgan N Trott, George G Schweitzer, Rabia S Rahman, Patrick V Kelly, Edward P Weiss
BACKGROUND: Low-carbohydrate, ketogenic diets cause mild, sub-clinical systemic acidosis. Anaerobic exercise performance is limited by acidosis. Therefore, we evaluated the hypothesis that a low-carbohydrate, ketogenic diet impairs anaerobic exercise performance, as compared to a high-carbohydrate diet. METHODS: Sixteen men and women (BMI, 23±1 kg/m2, age 23±1 yr) participated in a randomized-sequence, counterbalanced crossover study in which they underwent exercise testing after four days of either a low-carbohydrate, ketogenic diet (LC; <50 g/day and <10% of energy from carbohydrates) or a high-carbohydrate diet (HC; 6-10 g/kg/day carbohydrate)...
April 4, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29611324/validation-of-a-novel-wearable-wireless-technology-to-estimate-oxygen-levels-and-lactate-threshold-power-in-the-exercising-muscle
#14
Parisa Farzam, Zack Starkweather, Maria A Franceschini
There is a growing interest in monitoring muscle oxygen saturation (SmO2 ), which is a localized measure of muscle oxidative metabolism and can be acquired continuously and noninvasively using near-infrared spectroscopy (NIRS) methods. Most NIRS systems are cumbersome, expensive, fiber coupled devices, with use limited to lab settings. A novel, low cost, wireless, wearable has been developed for use in athletic training. In this study, we evaluate the advantages and limitations of this new simple continuous-wave (CW) NIRS device with respect to a benchtop, frequency-domain near-infrared spectroscopy (FDNIRS) system...
April 2018: Physiological Reports
https://www.readbyqxmd.com/read/29570580/effects-of-exercise-induced-muscle-damage-in-well-trained-cyclists-aerobic-and-anaerobic-performance
#15
Fábio C Karasiak, Luiz Guilherme A Guglielmo
This study purpose was to analyze the effect of EIMD in gross efficiency and in aerobic and anaerobic cycling performance. Nine well-trained cyclists (30.8 ± 6.4 years, cycling experience 8.4 ± 5.6 years) visited the laboratory 5 times. During the first visit, they performed a maximal incremental test on a cycle ergometer, to identify VO2max (55.2 ± 4.9 mL.kg.min) and maximum aerobic power (Pmax; 327.0 ± 28.5 watts). During the second visit (control), they cycled 5 minutes at 60% of Pmax, 5 minutes at 70% of Pmax, 5 minutes time-trial, and Wingate test...
March 22, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29568244/herbal-medicine-for-sports-a-review
#16
REVIEW
Maha Sellami, Olfa Slimeni, Andrzej Pokrywka, Goran Kuvačić, Lawrence D Hayes, Mirjana Milic, Johnny Padulo
The use of herbal medicinal products and supplements has increased during last decades. At present, some herbs are used to enhance muscle strength and body mass. Emergent evidence suggests that the health benefits from plants are attributed to their bioactive compounds such as Polyphenols, Terpenoids, and Alkaloids which have several physiological effects on the human body. At times, manufacturers launch numerous products with banned ingredient inside with inappropriate amounts or fake supplement inducing harmful side effect...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29562613/effects-of-low-versus-moderate-glycemic-index-diets-on-aerobic-capacity-in-endurance-runners-three-week-randomized-controlled-crossover-trial
#17
Krzysztof Durkalec-Michalski, Emilia E Zawieja, Bogna E Zawieja, Dominika Jurkowska, Maciej S Buchowski, Jan Jeszka
The glycemic index (GI) of ingested carbohydrates may influence substrate oxidation during exercise and athletic performance. Therefore, the aim of this study was to assess the effect of low- and moderate-GI three-week diets on aerobic capacity and endurance performance in runners. We conducted a randomized crossover feeding study of matched diets differing only in GI (low vs. moderate) in 21 endurance-trained runners. Each participant consumed both, low- (LGI) and moderate-GI (MGI) high-carbohydrate (~60%) and nutrient-balanced diets for three weeks each...
March 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29561245/the-efficacy-of-downhill-running-as-a-method-to-enhance-running-economy-in-trained-distance-runners
#18
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/29552503/sprint-cycling-training-improves-intermittent-run-performance
#19
Hardaway Chun-Kwan Chan, Weeraya Ka-Yan Ho, Patrick Shu-Hang Yung
Background/Objective: The aim of this study was to examine the effect of sprint cycling training on the intermittent run performance, sprinting speed, and change of direction (COD) ability of recreational intermittent sports athletes. Methods: Sixteen participants participated in the study. The experimental group (EG, n = 8) received a total of 12 sessions of sprint cycling training in a 4-week period and the control group (CG, n = 8) received no training. Both EG and CG were instructed to maintain their daily activity during the 4-week period...
January 2018: Asia-Pacific Journal of Sports Medicine, Arthroscopy, Rehabilitation and Technology
https://www.readbyqxmd.com/read/29544062/ingestion-of-carbohydrate-or-carbohydrate-plus-protein-does-not-enhance-performance-during-endurance-exercise-a-randomized-cross-over-placebo-controlled-clinical-trial
#20
Débora Finger, Fábio Juner Lanferdini, Juliano Boufleur Farinha, Clarissa Müller Brusco, Lucas Helal, Francesco Pinto Boeno, Eduardo Lusa Cadore, Ronei Silveira Pinto
INTRODUCTION: Protein (PRO) combined with a carbohydrate (CHO) beverage may have an ergogenic effect on endurance performance. However, evidence regarding its efficacy on similar conditions to athletes' race day is still lacking. OBJECTIVE: To compare the effect of three different nutritional supplementation strategies on performance and muscle recovery in a duathlon protocol. METHODS: , 13 male athletes (29.7 ± 7.7 years) participated in three simulated Olympic-distance duathlons under three different, randomly assigned, supplementation regimens: carbohydrate drink (CHO, 75 g); isocaloric CHO plus protein drink (CHO+PRO, 60...
March 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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