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https://www.readbyqxmd.com/read/29224500/transition-phase-clothing-strategies-and-their-effect-on-body-temperature-and-100-m-swimming-performance
#1
Andy Galbraith, Aimee Willmott
OBJECTIVE: Effective warm-ups are attributed to several temperature-related mechanisms. Strategies during the transition phase, preceding swimming competition, have been shown to prolong temperature-related warm-up effects. The purpose of this study was to evaluate the effects of two different clothing strategies during the transition phase, on subsequent 100-m maximal swimming performance. METHODS: Nine competitive swimmers (3 female, 21 ± 3 yrs; 6 male 20 ± 2 yrs, mean performance standard 702 FINA Points, mean 100-m seasons best time 61...
December 10, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29210958/the-reliability-and-validity-of-a-submaximal-warm-up-test-for-monitoring-training-status-in-professional-soccer-players
#2
Alireza Rabbani, Mehdi Kargarfard, Craig Twist
Two studies were conducted to assess the reliability and validity of a submaximal warm-up test (SWT) in professional soccer players. For the reliability study, 12 male players performed SWT over three trials, with one week between trials. For the validity study, 14 players of the same team performed SWT and 30-15 Intermittent Fitness Test (30-15IFT) 7 days apart. Week-to-week reliability in selected heart rate (HR) responses [exercise HR (HRex), HR recovery (HRR) expressed as the number of beats recovered within 1 min (HRR60s) and expressed as the mean HR during 1 min (HRpost1)], were determined using intraclass correlation coefficient (ICC) and typical error of measurement expressed as coefficient of variation (CV)...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29210957/the-physiological-and-performance-effects-of-caffeine-gum-consumed-during-a-simulated-half-time-by-professional-academy-rugby-union-players
#3
Russell M, Reynolds N A, Crewther B T, Cook C J, Kilduff L
Despite the prevalence of caffeine as an ergogenic aid, few studies have examined the use of caffeinated gums, especially during half-time in team sports. The physiological (blood lactate, salivary hormone concentrations) and performance (repeated sprints, cognitive function) effects of consuming caffeine gum during a simulated half-time were examined. Professional academy rugby union players (n=14) completed this double-blind, randomized, counterbalanced study. Following pre-exercise measurements , players chewed a placebo (PL) gum for five min before a standardized warm-up and completing repeated sprint testing (RSSA1)...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29210953/acute-effect-of-citrulline-malate-supplementation-on-upper-body-resistance-exercise-performance-in-recreationally-resistance-trained-men
#4
Adam M Gonzalez, Robert W Spitz, Jamie J Ghigiarelli, Katie M Sell, Gerald T Mangine
To investigate the effect of citrulline malate (CM) supplementation on upper-body resistance exercise performance, twelve recreationally resistance-trained men (21.4±1.6 y; 163.0±46.2 cm; 85.0±12.4 kg) underwent two testing sessions administered in a randomized, double-blind fashion. During each visit, participants were provided either 8 g of CM or a placebo (PL) 40 min prior to beginning a standardized warm-up and initiating a barbell bench press resistance exercise protocol consisting of 5 sets of 15 repetitions at 75% 1RM with 2-minute rest intervals...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29209504/the-fifa-11-injury-prevention-program-for-soccer-players-a-systematic-review
#5
David Sadigursky, Juliana Almeida Braid, Diogo Neiva Lemos De Lira, Bruno Almeida Barreto Machado, Rogério Jamil Fernandes Carneiro, Paulo Oliveira Colavolpe
Background: Soccer is one of the most widely played sports in the world. However, soccer players have an increased risk of lower limb injury. These injuries may be caused by both modifiable and non-modifiable factors, justifying the adoption of an injury prevention program such as the Fédération Internationale de Football Association (FIFA) 11+. The purpose of this study was to evaluate the efficacy of the FIFA 11+ injury prevention program for soccer players. Methodology: This meta-analysis was based on the PRISMA 2015 protocol...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29203453/a-transferable-high-intensity-intermittent-exercise-improves-executive-performance-in-association-with-dorsolateral-prefrontal-activation-in-young-adults
#6
Sylwester Kujach, Kyeongho Byun, Kazuki Hyodo, Kazuya Suwabe, Takemune Fukuie, Radoslaw Laskowski, Ippeita Dan, Hideaki Soya
Although growing attention has been drawn to attainable, high-intensity intermittent exercise (HIE)-based intervention, which can improve cardiovascular and metabolic health, for sedentary individuals, there is limited information on the impact and potential benefit of an easily attainable HIE intervention for cognitive health. We aimed to reveal how acute HIE affects executive function focusing on underlying neural substrates. To address this issue, we examined the effects of acute HIE on executive function using the color-word matching Stroop task (CWST), which produces a cognitive conflict in the decision-making process, and its neural substrate using functional near infrared spectroscopy (fNIRS)...
December 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/29194182/effect-of-post-activation-potentiation-induced-by-elastic-resistance-on-kinematics-and-performance-in-a-roundhouse-kick-of-trained-martial-arts-practitioners
#7
Håkon Strand Aandahl, Erna Von Heimburg, Roland Van den Tillaar
The aim of this study was to examine if kicking with elastic resistance during warm-up could initiate Post-Activation Potentiation (PAP), and thereby positively influence kinematics and performance on subsequent explosive roundhouse kicking. Five woman and eleven men (n=16) with a background in kickboxing (n=10) and/or TaeKwonDo (n=6) performed two warm-up strategies with three subsequent test-kicks 5-8 minutes after a PAP inducing exercise. Kicking performance, defined as roundhouse kicking velocity with the foot, was measured using 3D motion capture (500 Hz) with a 15 marker lower body 3D model...
November 29, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29189581/impact-of-10-minute-interval-roller-massage-on-performance-and-active-range-of-motion
#8
D D Hodgson, P J Quigley, J H D Whitten, J C Reid, David G Behm
Hodgson, DD, Quigley, PJ, Whitten, JHD, Reid, JC, and Behm, DG. Impact of 10-minute interval roller massage on performance and active range of motion. J Strength Cond Res XX(X): 000-000, 2017-Roller massage (RM) has been shown to increase range of motion (ROM) without subsequent performance deficits. However, prolonged static stretching (SS) can induce performance impairments. The objective of this study was to examine the effects of combining SS and RM with and without subsequent RM on ROM and neuromuscular performance...
November 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29184303/the-influence-of-the-vibration-form-roller-exercise-on-the-pains-in-the-muscles-around-the-hip-joint-and-the-joint-performance
#9
Sang-Wan Han, Yeon-Seop Lee, Dong-Jin Lee
[Purpose] The purpose of this study is to examine the influence of the vibration form-roller exercise on the pain in the hip joint and the joint performances. [Subjects and Methods] 30 adult patients were randomly sampled and divided into form-roller group (15) and the vibration form-roller group (15). The two groups were exposed to an exercise regimen of 3 sessions per week, over 4 weeks. Each session was composed of warming-up (5M), main exercises (20M), and five minutes of cool-down (5M). [Results] The result of this study, in the intra-group comparison of the Performance, the PRE group increase in the flexion, extension, and abduction of the hip joint, the VPRE group increase in flexion, extension, external rotation and internal rotation...
October 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29182457/a-comparison-of-the-isometric-mid-thigh-pull-and-isometric-squat-intraday-reliability-usefulness-and-the-magnitude-of-difference-between-tests
#10
Claire J Brady, Andrew J Harrison, Eamonn P Flanagan, G Gregory Haff, Thomas M Comyns
PURPOSE: This investigation examined the reliability and usefulness of the isometric mid-thigh pull (IMTP) and isometric squat (ISqT) performed at the same knee and hip angles. The scores produced in each test were compared to determine the magnitude of differences between tests. METHODS: Twenty six male and female athletes (23.6±4.3 y; 1.75±0.07 m; 68.8±9.7 kg) performed 2 maximal repetitions of the IMTP and ISqT following a specific warm up. RESULTS: Maximum force, absolute peak force (PF), relative PF, allometrically scaled PF, rate of force development (RFD) (0 - 200 and 0 - 250 ms) and impulse (0 - 300 ms) were deemed reliable (ICC ≥ 0...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29181257/shoulder-pain-in-competitive-teenage-swimmers-and-it-s-prevention-a-retrospective-epidemiological-cross-sectional-study-of-prevalence
#11
Monica Tessaro, Giorgio Granzotto, Antonio Poser, Giuseppe Plebani, Alex Rossi
Background: The term "swimmer's shoulder" was first introduced in 1974 by Kennedy and Hawkins to describe a common condition among competitive swimmers characterized by pain and dysfunction of the shoulder complex. Currently, the term does not define a specific clinical diagnosis and its etiology is considered to be multifactorial. In the literature shoulder pain prevalence varies according to the adopted definitions (from 3% to 91%); however, in the Italian environment there is no prevalence study regarding swimmer shoulder...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29178280/warm-up-effect-in-panelist-articulated-2-alternative-forced-choice-test
#12
David J Bloom, Hwa-Young Baik, Soo-Yeun Lee
Panelist performance in discrimination tests has been shown to increase when warm-up samples are provided prior to the actual test. Samples are used prior to the actual test for the attribute articulation process of a panelist-articulated-2-alternative forced choice (PA-2-AFC) procedure; however, it is yet unknown if the pretest articulation phase adds to the power of this testing method as with the warm-up. The goal of the study was to determine if a "warm-up" effect was displayed in the PA-2-AFC test resulting in greater power compared to the researcher-designated-2-AFC (RD-2-AFC) test...
November 27, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/29163193/changes-in-muscle-and-cerebral-deoxygenation-and-perfusion-during-repeated-sprints-in-hypoxia-to-exhaustion
#13
Sarah J Willis, Laurent Alvarez, Grégoire P Millet, Fabio Borrani
During supramaximal exercise, exacerbated at exhaustion and in hypoxia, the circulatory system is challenged to facilitate oxygen delivery to working tissues through cerebral autoregulation which influences fatigue development and muscle performance. The aim of the study was to evaluate the effects of different levels of normobaric hypoxia on the changes in peripheral and cerebral oxygenation and performance during repeated sprints to exhaustion. Eleven recreationally active participants (six men and five women; 26...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29153867/impact-of-upper-body-precooling-during-warm-up-on-subsequent-time-trial-paced-cycling-in-the-heat
#14
Charles P Katica, Jonathan E Wingo, Robert L Herron, Greg A Ryan, Stacy H Bishop, Mark Richardson
OBJECTIVES: The purpose of this study was to test the hypothesis that cooling the upper body during a warm-up enhances performance during a subsequent 16.1-km simulated cycling time trial in a hot environment. DESIGN: Counterbalanced, repeated measures design. METHODS: Eight trained, male cyclists (peak oxygen uptake=57.8±5.0mLkg(-1)min(-1)) completed two simulated 16.1-km time trials in a hot environment (35.0±0.5°C, 43.8±2.0% relative humidity) each separated by 72h...
October 16, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29147585/acute-exercise-and-neurocognitive-development-in-preadolescents-and-young-adults-an-erp-study
#15
Chien-Heng Chu, Arthur F Kramer, Tai-Fen Song, Chih-Han Wu, Tsung-Min Hung, Yu-Kai Chang
The purpose of this study was to examine the effect of a single bout of exercise on neurocognitive function in preadolescent children and young adults by determining the modulatory role of age and the neuroelectrical mechanism(s) underlying the association between acute exercise and executive function. Twenty preadolescents and 20 young adults completed the Stroop test, and neuroelectrical activity was recorded during two treatment sessions performed in a counterbalanced order. Exercise treatments involved moderate intensity aerobic exercise for 20 min as the main exercise and two 5 min periods of warm-up and cool-down...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/29138207/impact-of-improved-insulation-and-heating-on-mortality-risk-of-older-cohort-members-with-prior-cardiovascular-or-respiratory-hospitalisations
#16
Nicholas Preval, Michael Keall, Lucy Telfar-Barnard, Arthur Grimes, Philippa Howden-Chapman
OBJECTIVES: We carried out an evaluation of a large-scale New Zealand retrofit programme using administrative data that provided the statistical power to assess the effect of insulation and/or heating retrofits on cardiovascular and respiratory-related mortality in people aged 65 and over with prior respiratory or circulatory hospitalisations. DESIGN: Quasi-experimental cohort study based on administrative data. SETTING: New Zealand. PARTICIPANTS: From a larger study cohort of over 900 000 people, we selected two subcohorts: 3287 people who were aged 65 and over and had experienced pretreatment period cardiovascular-related hospitalisation (ICD-10 chapter 9), and 1561 people aged 65 and over who had experienced pretreatment respiratory-related hospitalisation (ICD-10 chapter 10)...
November 14, 2017: BMJ Open
https://www.readbyqxmd.com/read/29135785/comparison-of-polar-m600-optical-heart-rate-and-ecg-heart-rate-during-exercise
#17
John F Horton, Pro Stergiou, Tak S Fung, Larry Katz
PURPOSE: The purpose of this study was to evaluate the accuracy of the Polar M600 optical heart rate (OHR) sensor compared with ECG heart rate (HR) measurement during various physical activities. METHODS: Thirty-six subjects participated in a continuous 76-min testing session, which included rest, cycling warm-up, cycling intervals, circuit weight training, treadmill intervals, and recovery. HR was measured using a three-lead ECG configuration and a Polar M600 Sport Watch on the left wrist...
December 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29112055/self-selected-resistance-exercise-load-implications-for-research-and-prescription
#18
Sebastião Barbosa-Netto, Obanshe S dʼAcelino-E-Porto, Marcos B Almeida
Barbosa-Netto, S, d'Acelino-e-Porto, OS, and Almeida, MB. Self-selected resistance exercise load: implications for research and prescription. J Strength Cond Res XX(X): 000-000, 2017-Resistance training has been widely used for maintaining or improving the quality of life and sports performance. It is not clear, however, whether the load commonly used in these exercises is equivalent to the number of repetitions determined for execution, that is, the level of effort applied to the self-selected load. Ergo, the aim of this study was to identify the number of maximum repetitions that strength training practitioners can perform with the load commonly used (self-selected) to perform 10 repetitions in their training routines...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29109686/ketone-diester-ingestion-impairs-time-trial-performance-in-professional-cyclists
#19
Jill J Leckey, Megan L Ross, Marc Quod, John A Hawley, Louise M Burke
We investigated the effect of pre- "race" ingestion of a 1,3-butanediol acetoacetate diester on blood ketone concentration, substrate metabolism and performance of a cycling time trial (TT) in professional cyclists. In a randomized cross-over design, 10 elite male cyclists completed a ~31 km laboratory-based TT on a cycling ergometer programmed to simulate the 2017 World Road Cycling Championships course. Cyclists consumed a standardized meal [2 g/kg body mass (BM) carbohydrate (CHO)] the evening prior to a trial day and a CHO breakfast (2 g/kg BM CHO) with 200 mg caffeine on the morning of a trial day...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29108553/rhinarium-temperature-dynamics-in-domestic-dogs
#20
Ronald Heinz Herbert Kröger, Aitor Bereber Goiricelaya
Many mammals have specialized nose-tips with glabrous and often wet skin, called rhinaria. The function of the rhinarium is unknown in most species. Rhinaria differ not only in shape and skin structure, but also in skin temperature. They are considerably colder in carnivorans than in herbivorous artio- and perissodactyls. Domestic dogs are carnivorans and their noses often feel cold, such that they can be used as an abundant and easily accessible model species. We performed a study on rhinarium temperature in dogs under various ambient temperatures as well as in different behavioral and physiological contexts, breeds, and age groups...
December 2017: Journal of Thermal Biology
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