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https://www.readbyqxmd.com/read/28439212/effect-of-thyme-extract-supplementation-on-lipid-peroxidation-antioxidant-capacity-pgc-1%C3%AE-content-and-endurance-exercise-performance-in-rats
#1
Mostafa Khani, Pezhman Motamedi, Mohammad Reza Dehkhoda, Saeed Dabagh Nikukheslat, Pouran Karimi
BACKGROUND: Athletes have a large extent of oxidant agent production. In the current study, we aimed to determine the influence of thyme extract on the endurance exercise performance, mitochondrial biogenesis, and antioxidant status in rats. METHODS: Twenty male Wistar rats were randomly divided into two groups receiving either normal drinking water (non-supplemented group, n = 10) or thyme extract, 400 mg/kg, (supplemented group, n = 10). Rats in both groups were subjected to endurance treadmill training (27 m/min, 10% grade, 60 min, and 5 days/week for 8 weeks)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28404556/recent-acute-prerace-systemic-illness-in-runners-increases-the-risk-of-not-finishing-the-race-safer-study-v
#2
Leigh Gordon, Martin Schwellnus, Sonja Swanevelder, Esme Jordaan, Wayne Derman
AIM: There are limited data on the negative effects of exercise in athletes with acute infective illness. The aim of this study was to determine whether a recently diagnosed prerace acute illness in runners affects the ability to finish a race. METHODS: Runners were prospectively evaluated in the 3 days before the race for acute infective illness and then received participation advice using clinical criteria based on systemic or localised symptoms/signs. We compared the did-not-start and the did-not-finish frequencies of ill runners (Ill=172: localised=58...
April 12, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28398168/pre-game-perceived-wellness-highly-associates-with-match-running-performances-during-an-international-field-hockey-tournament
#3
Mohammed Ihsan, Frankie Tan, Sofyan Sahrom, Hui Cheng Choo, Michael Chia, Abdul Rashid Aziz
This study examined the associations between pre-game wellness and changes in match running performance normalised to either (i) playing time, (ii) post-match RPE or (iii) both playing time and post-match RPE, over the course of a field hockey tournament. Twelve male hockey players were equipped with global positioning system (GPS) units while competing in an international tournament (six matches over 9 days). The following GPS-derived variables, total distance (TD), low-intensity activity (LIA; <15 km/h), high-intensity running (HIR; >15 km/h), high-intensity accelerations (HIACC; >2 m/s(2)) and decelerations (HIDEC; >-2 m/s(2)) were acquired and normalised to either (i) playing time, (ii) post-match RPE or (iii) both playing time and post-match RPE...
June 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28397355/sex-differences-in-athletic-performance-emerge-coinciding-with-the-onset-of-male-puberty
#4
David J Handelsman
BACKGROUND: Male performance in athletic events begins to exceed that of age-matched females during early adolescence but the timing of this divergence relative to the onset of male puberty and the rise of circulating testosterone remains poorly defined. DESIGN: This study is a secondary quantitative analysis of four published sources which aimed to define the timing of the gender divergence in athletic performance and relating it to the rise in circulating testosterone due to male puberty...
April 11, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28368957/impact-of-endurance-exercise-in-hypoxia-on-muscle-damage-inflammatory-and-performance-responses
#5
Daichi Sumi, Chihiro Kojima, Kazushige Goto
This study evaluated muscle damage and inflammatory and performance responses following high-intensity endurance exercise in moderate hypoxia among endurance athletes. Nine trained endurance athletes completed two different trials on different days: exercise under moderate hypoxia (H trial, FiO2 = 14.5%) and normoxia (N trial, FiO2 = 20.9%). They performed interval exercises (10 × 3-min running at 95% of VO2max with 60-s of active rest at 60% of VO2max) followed by 30-min of continuous running at 85% of VO2max under either hypoxic or normoxic conditions...
March 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28362866/thoraco-abdominal-coordination-and-performance-during-uphill-running-at-altitude
#6
Eva Bernardi, Lorenza Pratali, Gaia Mandolesi, Maria Spiridonova, Giulio Sergio Roi, Annalisa Cogo
INTRODUCTION: Running races on mountain trails at moderate-high altitude with large elevation changes throughout has become increasingly popular. During exercise at altitude, ventilatory demands increase due to the combined effects of exercise and hypoxia. AIM: To investigate the relationships between thoraco-abdominal coordination, ventilatory pattern, oxygen saturation (SpO2), and endurance performance in runners during high-intensity uphill exercise. METHODS: Fifteen participants (13 males, mean age 42±9 yrs) ran a "Vertical Kilometer," i...
2017: PloS One
https://www.readbyqxmd.com/read/28362217/can-graduated-compressive-stockings-reduce-muscle-activity-during-running
#7
Ángel Gabriel Lucas-Cuevas, José Ignacio Priego Quesada, José Vicente Giménez, Inmaculada Aparicio, Juan Manuel Cortell-Tormo, Pedro Pérez-Soriano
PURPOSE: Graduated compressive stockings (GCS) have been suggested to influence performance by reducing muscle oscillations and improving muscle function and efficiency. However, no study to date has analyzed the influence of GCS on muscle activity during running. The objective of the study was to analyze the influence of GCS on the perception of comfort and muscle activation of the main muscles of the lower leg during running. METHOD: Thirty-six participants ran on a treadmill with (GCS) or without (control) GCS...
March 31, 2017: Research Quarterly for Exercise and Sport
https://www.readbyqxmd.com/read/28360121/prosthetic-model-but-not-stiffness-or-height-affects-the-metabolic-cost-of-running-for-athletes-with-unilateral-transtibial-amputations
#8
Owen N Beck, Paolo Taboga, Alena Marie Grabowski
Running-specific prostheses enable athletes with lower limb amputations to run by emulating the spring-like function of biological legs. Current prosthetic stiffness and height recommendations aim to mitigate kinematic asymmetries for athletes with unilateral transtibial amputations. However, it's unclear how different prosthetic configurations influence the biomechanics and metabolic costs of running. Consequently, we investigated how prosthetic model, stiffness, and height affect the biomechanics and metabolic costs of running...
March 30, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28350714/multiple-transportable-carbohydrate-impact-on-long-distance-triathlon-performance
#9
David S Rowlands, Stuart D Houltham
The ingestion of multiple (2:1 glucose:fructose) transportable carbohydrate in beverages at high rates (>78 g·h) during endurance exercise enhances exogenous carbohydrate oxidation, fluid absorption, gut comfort, and performance, relative to glucose alone. But during long-distance endurance competition, athletes prefer a solid-gel-drink format, and the effect size of multiple-transportable carbohydrate is unknown. PURPOSE: To determine the effect of multiple-transportable carbohydrate on triathlon competition performance when ingested within bars, gels, and drinks...
March 27, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28348529/sport-specific-capacity-to-use-elastic-energy-in-the-patellar-and-achilles-tendons-of-elite-athletes
#10
Hans-Peter Wiesinger, Florian Rieder, Alexander Kösters, Erich Müller, Olivier R Seynnes
Introduction: During running and jumping activities, elastic energy is utilized to enhance muscle mechanical output and efficiency. However, training-induced variations in tendon spring-like properties remain under-investigated. The present work extends earlier findings on sport-specific profiles of tendon stiffness and cross-sectional area to examine whether years of distinct loading patterns are reflected by tendons' ability to store and return energy. Methods:Ultrasound scans were performed to examine the morphological features of knee extensor and plantar flexor muscle-tendon units in elite ski jumpers, distance runners, water polo players, and sedentary controls...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28344459/applied-sports-nutrition-support-dietary-intake-and-body-composition-changes-of-a-female-athlete-completing-26-marathons-in-26-days-a-case-study
#11
Chris J McManus, Kelly A Murray, David A Parry
The aim of this case study is to describe the nutrition practices of a female recreational runner (VO2max 48.9 ml·kg(-1)·min(-1)) who completed 26 marathons (42.195 km) in 26 consecutive days. Information relating to the nutritional intake of female runners during multi-day endurance events is extremely limited, yet the number of people participating year-on-year continues to increase. This case study reports the nutrition intervention, dietary intake, body composition changes and performance in the lead-up and during the 26 days...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#12
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28328715/evaluating-injury-risk-and-gender-performance-on-health-and-skill-related-fitness-assessments
#13
Tyson L Grier, Michelle Canham-Chervak, Timothy T Bushman, Morgan K Anderson, William J North, Bruce H Jones
Grier, TL, Canham-Chervak, M, Bushman, TT, Anderson, MK, North, WJ, and Jones, BH. Evaluating injury risk and gender performance on health- and skill-related fitness assessments. J Strength Cond Res 31(4): 971-980, 2017-The purpose of this analysis was to investigate the association of injury risk and gender performance on health- and skill-related fitness assessments. A survey was used to collect personal characteristics and Army Physical Fitness Test scores (2-mile run, push-ups, and sit-ups). Within the same day, 9 physical fitness assessments were performed...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28328713/the-effect-of-standard-strength-vs-contrast-strength-training-on-the-development-of-sprint-agility-repeated-change-of-direction-and-jump-in-junior-male-soccer-players
#14
Mehréz Hammami, Yassine Negra, Roy J Shephard, Mohamed Souhaiel Chelly
Hammami, M, Negra, Y, Shephard, RJ, and Chelly, MS. The effect of standard strength vs. contrast strength training on the development of sprint, agility, repeated change of direction, and jump in junior male soccer players. J Strength Cond Res 31(4): 901-912, 2017-The aim was to compare the impact of 2 differing strength training (ST) programs on the athletic performance of junior male soccer players at a critical phase during their competitive season. Participants aged 16.0 ± 0.5 years were randomly assigned between control (C, n = 12), standard ST (n = 16), and contrast strength training (CST, n = 16), each performed twice a week...
April 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28327503/beetroot-juice-supplementation-improves-high-intensity-intermittent-type-exercise-performance-in-trained-soccer-players
#15
Jean Nyakayiru, Kristin L Jonvik, Jorn Trommelen, Philippe J M Pinckaers, Joan M Senden, Luc J C van Loon, Lex B Verdijk
It has been shown that nitrate supplementation can enhance endurance exercise performance. Recent work suggests that nitrate ingestion can also increase intermittent type exercise performance in recreational athletes. We hypothesized that six days of nitrate supplementation can improve high-intensity intermittent type exercise performance in trained soccer players. Thirty-two male soccer players (age: 23 ± 1 years, height: 181 ± 1 m, weight: 77 ± 1 kg, playing experience: 15.2 ± 0.5 years, playing in the first team of a 2nd or 3rd Dutch amateur league club) participated in this randomized, double-blind cross-over study...
March 22, 2017: Nutrients
https://www.readbyqxmd.com/read/28306388/effects-of-body-mapping-designed-clothing-on-heat-stress-and-running-performance-in-a-hot-environment
#16
Jiao Jiao, Yi Li, Lei Yao, Yajun Chen, Yueping Guo, Stephen H S Wong, Frency S F Ng, Junyan Hu
To investigate clothing-induced differences in human thermal response and running performance, eight male athletes participated in a repeated-measure study by wearing three sets of clothing (CloA, CloB, and CloC). CloA and CloB were body-mapping-designed with 11% and 7% increased capacity of heat dissipation respectively than CloC, the commonly used running clothing. The experiments were conducted by using steady-state running followed by an all-out performance running in a controlled hot environment. Participants' thermal responses such as core temperature (Tc), mean skin temperature [Formula: see text], heat storage (S), and the performance running time were measured...
March 17, 2017: Ergonomics
https://www.readbyqxmd.com/read/28301436/the-effects-of-recovery-duration-during-high-intensity-interval-exercise-on-time-spent-at-high-rates-of-oxygen-consumption-oxygen-kinetics-and-blood-lactate
#17
Ilias Smilios, Aristides Myrkos, Andreas Zafeiridis, Argyris Toubekis, Apostolos Spassis, Savas P Tokmakidis
The recovery duration and the work to recovery ratio are important aspects to consider when designing a high-intensity aerobic interval exercise (HIIE). This study examined the effects of recovery duration on total exercise time performed above 80, 90 and 95% of maximum oxygen consumption (VO2max) and heart rate (HRmax) during a single-bout HIIE. We also evaluated the effects on VO2 and HR kinetics, blood lactate concentration and rating of perceived exertion (RPE). Eleven moderately trained males (22.1±1 yrs...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28292885/heavy-strength-training-improves-running-and-cycling-performance-following-prolonged-submaximal-work-in-well-trained-female-athletes
#18
Olav Vikmoen, Bent R Rønnestad, Stian Ellefsen, Truls Raastad
The purpose of this study was to investigate the effects of adding heavy strength training to female duathletes' normal endurance training on both cycling and running performance. Nineteen well-trained female duathletes (VO2max cycling: 54 ± 3 ml∙kg(-1)∙min(-1), VO2max running: 53 ± 3 ml∙kg(-1)∙min(-1)) were randomly assigned to either normal endurance training (E, n = 8) or normal endurance training combined with strength training (E+S, n = 11). The strength training consisted of four lower body exercises [3 × 4-10 repetition maximum (RM)] twice a week for 11 weeks...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28290718/assessments-of-mechanical-stiffness-and-relationships-to-performance-determinants-in-middle-distance-runners
#19
Simon A Rogers, Chris S Whatman, Simon N Pearson, Andrew E Kilding
PURPOSE: This study aimed to examine relationships between methods of lower-limb stiffness and their associations with running economy (RE) and maximal velocity (vmax) in middle-distance (MD) runners. METHODS: Eleven highly-trained male MD runners performed a series of mechanical and physiological tests to determine maximal overground sprint speed, RE and V̇O2peak. Achilles tendon stiffness (kT) was estimated using ultrasonography during maximal isometric ankle plantarflexion...
March 14, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28290716/cycling-vs-uphill-walking-impact-on-locomotor-muscle-fatigue-and-running-exercise
#20
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
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