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https://www.readbyqxmd.com/read/29232314/postexercise-fructose-maltodextrin-ingestion-enhances-subsequent-endurance-capacity
#1
Ed Maunder, Tim Podlogar, Gareth A Wallis
PURPOSE: Restoring skeletal muscle and hepatic glycogen content during short-term (<6 h) recovery from prolonged exercise is pertinent for athletes seeking to maximize performance in repeated exercise bouts. Previous research suggests co-ingestion of fructose-glucose carbohydrate sources augments hepatic and has equivalent effects on skeletal muscle glycogen storage during short-term recovery from prolonged exercise compared to isocaloric glucose ingestion. The aim of the present investigation was to determine if this has a discernible effect on subsequent exercise capacity...
December 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29214921/heteropterys-tomentosa-a-juss-toxicological-and-adaptogenic-effects-in-experimental-models
#2
Géssica Alves Fraga, Sikiru Olaitan Balogun, Emilly Della Pascqua, Ruberlei Godinho de Oliveira, Guilherme Botelho, Eduarda Pavan, Thiago da Rosa Lima, Eudes Thiago Pereira Avila, Clarissa de Medeiros Amorim Krueger, Valdir Cechinel Filho, Amílcar Sabino Damazo, Domingos Tabajara de Oliveira Martins, Fabrício Azevedo Voltarelli
BACKGROUND: The constant pursuit of improved athletic performance characterizes high-performance sport and the use of medicinal plants as dietary supplements is becoming widespread among athletes to enhance long-term endurance performance. AIM: The present study evaluated the toxicity of Heteropterys tomentosa (HEHt) and its acute adaptogenic effects. METHODS: The in vitro safety profile was evaluated on CHO-k1 cells using the alamar Blue assay, at concentrations ranging from 3...
December 2017: Nutrition and Health
https://www.readbyqxmd.com/read/29206785/three-weeks-of-overload-training-increases-resting-muscle-sympathetic-activity
#3
Alexandra M Coates, Anthony V Incognito, Jeremy D Seed, Connor J Doherty, Philip J Millar, Jamie F Burr
PURPOSE: Overload training is hypothesized to alter autonomic regulation, though interpretations using indirect measures of heart rate variability are conflicting. The aim of the present study was to examine the effects of overload training on muscle sympathetic nerve activity (MSNA), a direct measure of central sympathetic outflow, in recreational endurance athletes. METHODS: Measurements of heart rate variability, cardiac baroreflex sensitivity (BRS), MSNA (microneurography), and sympathetic BRS were obtained in seventeen healthy triathletes and cyclists after 1-week of reduced training (baseline) and following 3-weeks of either regular (CON, n=7) or overload (OL, n=10) training...
December 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29205517/within-day-energy-deficiency-and-reproductive-function-in-female-endurance-athletes
#4
I L Fahrenholtz, A Sjödin, D Benardot, Å B Tornberg, S Skouby, J Faber, J Sundgot-Borgen, A Melin
We aimed to estimate and compare within-day energy balance (WDEB) in athletes with eumenorrhea and menstrual dysfunction (MD) with similar 24-hour energy availability/energy balance (EA/EB). Furthermore, to investigate whether within-day energy deficiency is associated with resting metabolic rate (RMR), body-composition, S-cortisol, estradiol, T3 , and fasting blood glucose. We reanalyzed 7-day dietary intake and energy expenditure data in 25 elite endurance athletes with eumenorrhea (n=10) and MD (n=15) from a group of 45 subjects where those with disordered eating behaviors (n=11), MD not related to low EA (n=5), and low dietary record validity (n=4) had been excluded...
December 5, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29198116/characterization-and-detection-of-epo-fc-fusion-proteins-using-lc-ms
#5
Natalia V Mesonzhnik, Pavel V V Postnikov, Svetlana A Appolonova, Grigory I Krotov
EPO-Fc fusion proteins are potential drug candidates that have been designed for the treatment of anaemia in humans by stimulating erythrocyte production. Such compounds can be considered performance enhancing agents that may be used by athletes in endurance sports. This study describes the primary structure of commercially available EPO-Fc based on comprehensive liquid-chromatography coupled with mass-spectrometry (LC-MS) analysis. A bottom-up approach and the intact molecular weight (MW) measurement of deglycosylated protein and its IdeS proteolytic fractions was used to determine the amino acid sequence of EPO-Fc...
December 2, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29189668/the-role-of-airway-inflammation-and-bronchial-hyperresponsiveness-in-athlete-s-asthma
#6
Julie Stang, Liv Ingunn Bjoner Sikkeland, Ellen Tufvesson, Are Martin Holm, Trine Stensrud, Kai-Håkon Carlsen
PURPOSE: Asthma is frequently reported in endurance athletes. The aim of the present study was to assess the long-term airway inflammatory response to endurance exercise in high-level athletes with and without asthma. METHODS: In a cross-sectional design, 20 asthmatic athletes (10 swimmers, 10 cross-country skiers), 19 athletes without asthma (10 swimmers, 9 cross-country skiers) and 24 healthy non-athletes completed methacholine bronchial challenge, lung function tests and sputum induction on two separate days...
November 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29181259/injury-patterns-in-adolescent-elite-endurance-athletes-participating-in-running-orienteering-and-cross-country-skiing
#7
Philip von Rosen, Frida Floström, Anna Frohm, Annette Heijne
Background: Prospective injury registration studies, monitoring adolescent elite athletes, are sparse in running, orienteering and cross-country skiing, yet essential for developing prevention programs. Purpose: The aims of this study were to describe the injury prevalence/incidence, severity grade, injury location, risk factors and the prevalence of illness in running (RU), orienteering (OR) and cross-country skiing athletes (CR). Study Design: Prospective cohort study...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29173470/effect-of-long-term-aerobic-anaerobic-and-aerobic-anaerobic-physical-training-in-seric-toxic-minerals-concentrations
#8
Marcos Maynar-Mariño, Francisco Llerena, Ignacio Bartolomé, Carmen Crespo, Diego Muñoz, María-Concepción Robles, María-Jesús Caballero
BACKGROUND: Many substances poured out from industries can be toxic to humans and can impair physical performance. Besides, physical training may modify the body concentrations of these substances as a result of physiological adaptations. OBJECTIVES: The aim of the study was to determine if different modalities of exercise might affect serum concentrations of toxic trace elements in sportsmen. METHODS: 80 Spanish national sportsmen were recruited before the start of their training period...
January 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29168967/menstrual-irregularity-and-use-of-oral-contraceptives-in-female-adolescent-athletes-in-swedish-national-sports-high-schools
#9
Philip von Rosen, Annette Heijne, Anna Frohm, Cecilia Fridén
Objective Female adolescent athletes seem to use oral contraceptives (OCs) in the same proportion as the general population. In athletes not using OCs, menstrual irregularity (MI) is reported to be common but there are few studies of MI in adolescent athletes. The aim of the study was to survey menarche, menstrual irregularity and use of OCs in adolescent athletes in the National Sports High Schools in Sweden. A further aim was to study the associations between current sport injury and menstrual irregularity as well as use of OCs...
November 23, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/29165733/impact-of-type-of-sport-gender-and-age-on-red-blood-cell-deformability-of-elite-athletes
#10
Fabian Tomschi, Wilhelm Bloch, Marijke Grau
Our objective was to detect possible differences in red blood cell (RBC) deformability of elite athletes performing different types of sports and being of different age and gender.182 athletes were included in this cross-sectional study. RBC deformability was measured using the laser-assisted optical rotational cell-analyzer. Maximal elongation index (EI max) and shear stress at half-maximum deformation (SS 1/2) were calculated. The ratio SS 1/2 /EI max (EI Ratio) was calculated with low values representing high RBC deformation...
November 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29161094/the-effect-of-resistance-training-in-a-hypoxic-chamber-on-physical-performance-in-elite-rugby-athletes
#11
Brad Mayo, Cory Miles, Stacy Sims, Matthew Driller
Mayo, Brad, Cory Miles, Stacy Sims, and Matthew Driller. The effect of resistance training in a hypoxic chamber on physical performance in elite rugby athletes. High Alt Med Biol 00:000-000, 2017.-Limited research suggests that muscle adaptations may be enhanced through resistance training in a hypoxic environment. Seventeen professional rugby union athletes (age [mean ± SD], 24 ± 3 years; body mass, 98.7 ± 12.8 kg; and height, 188.9 ± 7.9 cm), performed 12 resistance training sessions over a 3-week period...
November 21, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29159669/thyroid-hormones-and-commonly-cited-symptoms-of-overtraining-in-collegiate-female-endurance-runners
#12
Justin X Nicoll, Disa L Hatfield, Kathleen J Melanson, Christopher S Nasin
PURPOSE: Overtraining syndrome (OTS) is reported in endurance sports. Thyroid hormones (TH) regulate metabolism, mood, and energy production, and may play a role in OTS of endurance athletes. The purpose of this study was to investigate relationships in TH and symptoms of OTS in track and field endurance runners (ER). METHODS: Sixteen female track and field middle distance (MD; n = 9; age: 20.2 ± 1.5 years; ht: 167.86 ± 5.04 cm; body-mass: 57.97 ± 5...
November 20, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29158615/using-lactate-threshold-to-predict-5-km-treadmill-running-performance-in-veteran-athletes
#13
Jacky Forsyth, Dean Burt, Fiona Ridley, Christopher Mann
Measuring lactate threshold to predict endurance performance is difficult among veteran athletes, due to age-related decreases in net lactate concentration. The objective of this study was to determine whether lactate threshold, as assessed using the maximal deviation method (Dmax), which is not dependent on net values of lactate, could be used as a more valid measure of 5-km treadmill running performance than other methods of determining lactate threshold. Veteran runners (18 male and 18 female, aged 47.3±6...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29146459/factors-influencing-food-choice-of-athletes-at-international-competition-events
#14
Fiona E Pelly, Sarah J Burkhart, Peter Dunn
Although the nutrient requirements and dietary intake of athletes have been thoroughly investigated, little is known about the influences on their food choice, particularly prior to and during competition. This study sought to investigate factors that influence food selection of athletes at two similar international competition events: the Melbourne 2006 and Delhi 2010 Commonwealth Games. A secondary aim was to explore differences in these factors between at each event given the culturally diverse locations...
November 14, 2017: Appetite
https://www.readbyqxmd.com/read/29146288/unusual-iliac-crest-stress-fracture-in-a-marathoner-a-case-report
#15
Amy M West, Kelly C McInnis
This case presentation describes a 50-year-old healthy woman who developed left sided hip pain while training for the Boston Marathon. Magnetic Resonance Imaging (MRI) demonstrates a stress fracture of the left iliac body. This injury is unique in that it did not occur in the setting of low bone mineral density and it does not fall into the current published radiographic categorization based on location of injury. This case illustrates an uncommon and atypical bone stress injury in an endurance athlete. It should be considered in the differential diagnosis of runners presenting with hip or lumbopelvic pain...
November 13, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29139646/physical-fitness-and-digit-ratio-2d-4d-in-male-students-from-wroc%C3%A5-aw-poland
#16
Slawomir Koziel, Marek Kociuba Mail, Raja Chakraborty, Zofia Ignasiak
There is sex-difference in humans as regards aerobic efficiency, physical strength and endurance and the sex difference is greatly dependent upon differential concentration of testosterone during different phases of growth and development including the intrauterine phase or prenatal growth. Second-to-fourth digit lengths ratio (2D:4D) is an putative indicator of prenatal testosterone exposure. Lower 2D:4D indicates higher prenatal testosterone exposure and vice versa. Males generally have lower 2D:4D than females...
March 2017: Collegium Antropologicum
https://www.readbyqxmd.com/read/29135641/the-pediatric-endurance-athlete
#17
Mary L Solomon, Susannah M Briskin, Nicole Sabatina, Jennifer E Steinhoff
Youth sports participation numbers continue to grow in the United States. A shift toward sport specialization has caused an increase in sport training frequency and intensity that places the growing athlete at risk for overtraining, nutritional deficits, and injuries. Individuals who participate in endurance sports are at especially high risk. Youth runners and swimmers are high-risk populations that require special attention to their training schedules, nutritional intake, and injuries. Appropriate scheduling of training, dedicating time to rest, and nutrition education can help prevent problems in the endurance athlete...
November 2017: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/29134974/differences-in-physical-physiological-and-motor-performance-traits-between-volleyball-and-basketball-athletes-in-a-university-in-ghana
#18
A Obour, M O Moses, B Baffour-Awuah, B Asamoah, P K Sarpong, F Osei, L G Akwa, E J Appiah
Physical, physiological and motor performance traits play substantial role in both volleyball (VB) and basketball(BB) competitions. The differences in these traits among University athletes in Ghana have not been reported. Hence, thisstudy documents and compares the physical, physiological and motor performance traits of VB and BB university athletes.Purposive sampling technique involving thirty-five university athletes (24 males and 11 females) with mean age of 21.77 ±2.03years was used. Height, weightn, waist and hip circumferences, waist to hip ratio (WHR), body mass index (BMI), heartrate (HR), systolic blood pressure (SBP) and diastolic blood pressure (DBP), shoulder muscular endurance (SME), abdominal muscular endurance (AME), left and right Arm Strength, Leg Power, Reaction time, Agility and Speed traits were measured...
June 30, 2017: Nigerian Journal of Physiological Sciences: Official Publication of the Physiological Society of Nigeria
https://www.readbyqxmd.com/read/29134050/mental-strategies-predict-performance-and-satisfaction-with-performance-among-soccer-players
#19
Magdalena Kruk, Jan Blecharz, Monika Boberska, Karolina Zarychta, Aleksandra Luszczynska
This study investigated the changes in mental strategies across the season and their effects on performance and satisfaction with individual performance. Data were collected three times: at the pre-season at Time 1 (T1; baseline), in the mid-season at Time 2 (T2; two-month follow-up), and at the end-of-season at Time 3 (T3; nine-month follow-up) among male soccer players (N = 97) aged 16-27. Athletes completed the questionnaires assessing the use of nine psychological strategies in competition and the level of satisfaction with individual performance...
October 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29129021/the-effect-of-natural-or-simulated-altitude-training-on-high-intensity-intermittent-running-performance-in-team-sport-athletes-a-meta-analysis
#20
REVIEW
Michael J Hamlin, Catherine A Lizamore, Will G Hopkins
BACKGROUND: While adaptation to hypoxia at natural or simulated altitude has long been used with endurance athletes, it has only recently gained popularity for team-sport athletes. OBJECTIVE: To analyse the effect of hypoxic interventions on high-intensity intermittent running performance in team-sport athletes. METHODS: A systematic literature search of five journal databases was performed. Percent change in performance (distance covered) in the Yo-Yo intermittent recovery test (level 1 and level 2 were used without differentiation) in hypoxic (natural or simulated altitude) and control (sea level or normoxic placebo) groups was meta-analyzed with a mixed model...
November 11, 2017: Sports Medicine
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