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Endurance performance

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https://www.readbyqxmd.com/read/28806275/effects-of-creatine-and-carbohydrate-loading-on-cycling-time-trial-performance
#1
Kristyen A Tomcik, Donny M Camera, Julia L Bone, Megan L Ross, Nikki A Jeacocke, Bill Tachtsis, Joan Senden, Luc J C van Loon, John A Hawley, Louise M Burke
INTRODUCTION: Creatine- and carbohydrate-loading are dietary strategies used to enhance exercise capacity. This study examined the metabolic and performance effects of a combined creatine and CHO-loading regiment on time-trial (TT) cycling bouts. METHODS: Eighteen well-trained (~65mL[BULLET OPERATOR]kg[BULLET OPERATOR]min VO2peak) males completed three performance trials (PT) comprised of a 120-km cycling TT interspersed with alternating 1- and 4-km sprints (6 sprints each) performed every 10-km followed by an inclined ride to fatigue (~90% VO2peak)...
August 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28805069/assessing-the-quality-of-life-in-patients-with-multiple-sclerosis-in-kuwait-a-cross-sectional-study
#2
Eman J Abdullah, Hanan E Badr
The main objective of this paper was to assess the level and the determinants of quality of life (QOL) amongst patients with multiple sclerosis (MS). A cross-sectional study was conducted among a convenience sample of 200 adult MS patients. Inclusion criteria were: MS diagnosis for at least one year, and aged 21+ years. However, exclusion criteria were: having other neurological diseases, serious cardiovascular, orthopedic or other disability precluding participation. Self-administered questionnaire employed MSQOL-54 with two outcomes: Physical Health Composite (PHC) and mental health composite (MHC)...
August 13, 2017: Psychology, Health & Medicine
https://www.readbyqxmd.com/read/28801974/heritability-estimates-of-endurance-related-phenotypes-a-systematic-review-and-meta-analysis
#3
Eri Miyamoto-Mikami, Hirofumi Zempo, Noriyuki Fuku, Naoki Kikuchi, Motohiko Miyachi, Haruka Murakami
The aim of this study was to clarify heritability estimates for endurance-related phenotypes and the underlying factors affecting these estimates. A systematic literature search was conducted for studies reporting heritability estimates of endurance-related phenotypes using the PubMed database (up to September 30, 2016). Studies that estimated the heritability of maximal oxygen uptake (VO2 max), submaximal endurance phenotypes, and endurance performance were selected. The weighted mean heritability for endurance-related phenotypes was calculated using a random-effects model...
August 12, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28801952/positioning-telling-and-performing-a-male-illness-chronic-prostatitis-chronic-pelvic-pain-syndrome
#4
Nicholas Wood, Annum Qureshi, Fahim Mughal
OBJECTIVES: There is a paucity of illness accounts of men with chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS), despite a significant level of prevalence and burden of disease. This qualitative study thus elicited twelve accounts from men suffering with CP/CPPS. METHODS: Narrative analysis was employed, focusing primarily on narrative content. RESULTS: Three major narrative themes were identified: (1) Medical stories: Blame and shame; (2) The Erratic nature of CP/CPPS; and (3) Ongoing struggles for coping and cures and the Search for meaning...
August 11, 2017: British Journal of Health Psychology
https://www.readbyqxmd.com/read/28801776/effects-of-training-status-on-pdh-regulation-in-human-skeletal-muscle-during-exercise
#5
Anders Gudiksen, Lærke Bertholdt, Tomasz Stankiewicz, Jonas Tybirk, Peter Plomgaard, Jens Bangsbo, Henriette Pilegaard
Pyruvate dehydrogenase (PDH) is the gateway enzyme for carbohydrate-derived pyruvate feeding into the TCA cycle. PDH may play a central role in regulating substrate shifts during exercise, but the influence of training state on PDH regulation during exercise is not fully elucidated. The purpose of this study was to investigate the impact of training state on post-translational regulation of PDHa activity during submaximal and exhaustive exercise. Eight untrained and nine endurance exercise-trained healthy male subjects performed incremental exercise on a cycle ergometer: 40 min at 50% incremental peak power output (IPPO), 10 min at 65% (IPPO), followed by 80% (IPPO) until exhaustion...
August 11, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28800307/dynamic-trunk-muscle-endurance-profile-in-adolescents-aged-14-18-normative-values-for-age-and-gender-differences
#6
Manuel Moya-Ramón, Casto Juan-Recio, Diego Lopez-Plaza, Francisco Jose Vera-Garcia
BACKGROUND: The selection and validation of age- and gender-specific criterion-referenced cut-points for abdominal endurance are still unclear. OBJECTIVE: To stablish normative values for abdominal endurance in adolescents by age and gender using the Bench Trunk Curl-up Test (BTC). Additionally, the reliability of the BTC was analyzed. METHODS: Two hundred and sixteen untrained high school students (104 males - 112 females) were grouped into five age strata...
July 2, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28800306/acute-effects-of-kinesio-taping-on-pain-disability-and-back-extensor-muscle-endurance-in-patients-with-low-back-pain-caused-by-magnetic-resonance-imaging-confirmed-lumbar-disc-degeneration
#7
Nai-Jen Chang, Willy Chou, Pei-Chi Hsiao, Wen-Dien Chang, Yi-Ming Lo
BACKGROUND: Individuals with disc degeneration experience associated pain and disability. Considering its safety and affordability, Kinesio tape (KT) may be a viable treatment. However, most KT studies have demonstrated its effects in healthy adults and patients with nonspecific low back pain. The efficacy of KT in patients with disc degeneration is yet to be investigated. OBJECTIVES: To examine the acute effects of KT on patients with lumbar disc degeneration confirmed through magnetic resonance imaging...
August 4, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28800004/sport-specific-repeated-sprint-training-improves-punching-ability-and-upper-body-aerobic-power-in-experienced-amateur-boxers
#8
Sigitas Kamandulis, Vidas Bruzas, Pranas Mockus, Alvydas Stasiulis, Audrius Snieckus, Tomas Venckunas
High-intensity interval training improves endurance and performance, but it is unclear whether sprint-type upper-body interval training is similarly effective. This study explored the effects of 4-week sport-specific sprint interval training on punch characteristics and endurance capacity in boxers. Experienced male amateur boxers (n = 18) participated in this 4-week training study, and were divided into an experimental group (EG) and a control group (CG) (n = 9 per group). Both groups completed standard low-intensity training...
August 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28799161/performance-factors-in-a-mountain-ultramarathon
#9
Pascal Balducci, Michel Clémençon, Robin Trama, Yoann Blache, Christophe Hautier
This study aimed to determine mountain ultra-marathon (MUM) performance factors in a large group of endurance mountain runners. Maximal aerobic speed (MAS) was assessed one week prior to the MUM. The level and graded (10%) energy cost of running, stiffness, knee extensors force (KEf), and jump height on a counter movement jump (CMJ) were measured in 24 male ultra runners before (pre) and immediately after (post) the Interlacs Trail (75 km and 3 930/3 700 m d+/d-). Performance time was correlated with MAS (r=- 0...
August 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28797049/effect-of-sodium-bicarbonate-on-prolonged-running-performance-a-randomized-double-blind-cross-over-study
#10
Tanja Freis, Anne Hecksteden, Ulf Such, Tim Meyer
BACKGROUND: The ability to sustain intense exercise seems to be partially limited by the body's capability to counteract decreases in both intra- and extracellular pH. While the influence of an enhanced buffering capacity via sodium bicarbonate (BICA) on short-term, high-intensity exercise performance has been repeatedly investigated, studies on prolonged endurance performances are comparatively rare, especially for running. The aim of the following study was to assess the ergogenic effects of an oral BICA substitution upon exhaustive intensive endurance running performance...
2017: PloS One
https://www.readbyqxmd.com/read/28796484/superhydrophobic-superoleophilic-and-reinforced-ethyl-cellulose-sponges-for-oil-water-separation-synergistic-strategies-of-cross-linking-carbon-nanotube-composite-and-nanosilica-modification
#11
Yeqiang Lu, Weizhong Yuan
Superhydrophobic/superoleophilic and reinforced ethyl cellulose (SEC) sponges were prepared by cross-linking EC with epichlorohydrin (ECH) and complexing with silanized carbon nanotubes (Si-CNTs) followed by coating nanosilica on the surface of porous sponges and subsequent modification with hexadecyltrimethoxysilane (HDTMS). These synergistic strategies endowed the SEC sponges with the superhydrophobic/superoleophilic properties (θwater=158.2°, θoil=0°, sliding angle=3°) and outstanding mechanical properties (could bear the pressure of 28...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28796129/pacing-profiles-and-competitive-performance-of-elite-female-400-m-freestyle-swimmers
#12
Patrycja Lipinska, Will G Hopkins
Pacing can impact competitive endurance performance. The objective of this study was to determine relationships between pacing parameters and competitive performance of elite female 400-m freestyle swimmers. Publicly available websites provided 50-m split and final times for 381 swims of 20 elite female swimmers in over 150 national and international competitions between 2004 and 2016. Most pacing profiles displayed negative quadratic curvature, with the fifth of the eight laps being the median slowest. The mean times for the first and last laps were faster than predicted by the quadratic by 5...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796127/a-systematic-review-of-the-association-between-physical-fitness-and-musculoskeletal-injury-risk-part-2-muscular-endurance-and-muscular-strength
#13
Sarah J de la Motte, Timothy C Gribbin, Peter Lisman, Kaitlin Murphy, Patricia A Deuster
This is a systematic review and evaluation of the current evidence on the association between muscular endurance (ME) and/or muscular strength (MS) and musculoskeletal injury (MSK-I) risk in military and civilian populations. MEDLINE, EBSCO, EMBASE, and the Defense Technical Information Center were searched for original studies published from 1970 through 2015 that examined associations between physical fitness (ME and MS) and MSK-I in military or civilian populations. Methodological quality and strength of the evidence were determined following criteria adapted from previously published systematic reviews...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796126/physiological-pattern-changes-in-response-to-a-simulated-competition-in-elite-women-artistic-gymnasts
#14
Laurie Isacco, Gaël Ennequin, Johan Cassirame, Nicolas Tordi
The outstanding progress in women's artistic gymnastics in recent decades has led to increased technical and physiological demands. The aim of this study was to investigate i) the physiological demands of elite French gymnasts and ii) the impact of a competitive routine on physiological pattern changes. Fourteen French elite female gymnasts performed anthropometric measurements, physical fitness tests and a simulated four event competition. Heart rate (HR) was continuously recorded throughout the duration of the simulated competition...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28796125/electromyographic-and-kinematic-analysis-of-the-flexion-rotation-trunk-test
#15
María P García-Vaquero, Ignacio Ruiz-Pérez, David Barbado, Francisco J Vera-Garcia
While most trunk endurance field protocols are performed in the sagittal or frontal planes, the flexion-rotation trunk (FRT) test combines trunk flexion with rotation, which may be relevant to rotation-related sports. The aim of this study was to describe the trunk and hip muscle activation and fatigue and the range of hip flexion of this test. Twenty-seven physically active males and females performed the FRT test after a period of practice. Electromyographic (EMG) signals were bilaterally collected from the rectus abdominis (RA), internal oblique (IO), and rectus femoris (RF), and hip flexion amplitude was measured using a biaxial electrogoniometer...
August 4, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28795003/resistance-training-for-children-and-adolescents
#16
REVIEW
Allison M Myers, Nicholas W Beam, Joseph D Fakhoury
As more children and adolescents are becoming involved in exercise and school or community based athletics, attention is turned towards proper training and conditioning to optimize performance, stimulate athletic development and ensure safety while tolerating long-term competition. Resistance training (RT) refers to the methodology of ensuring such optimal performance and safety. This is a common component of sports and physical fitness in schools and organized athletic programs around the country. RT is a physical conditioning program that involves various training techniques (e...
July 2017: Translational pediatrics
https://www.readbyqxmd.com/read/28792279/resting-mapk-expression-in-chronically-trained-endurance-runners
#17
Justin X Nicoll, Andrew C Fry, Andrew J Galpin, Donald B Thomason, Christopher A Moore
PURPOSE: There is a paucity of research investigating the expression of mitogen-activated protein kinases (MAPK) in chronically trained (CT) athletes. Thus, it is unclear how MAPK may contribute to performance and muscle adaptation in CT subjects. The purpose of this study was to determine MAPK total protein, and phosphorylated expression of extracellular signal-regulated kinases 1 and 2 (ERK1/2), c-Jun N-terminal kinase (JNK), and p38-MAPK (p38) between untrained, and chronically trained runners...
August 9, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28791650/nicotine-sporting-friend-or-foe-a-review-of-athlete-use-performance-consequences-and-other-considerations
#18
REVIEW
Toby Mündel
Nicotine use amongst athletes is high and increasing, especially in team sports. This narrative review examines the rationale behind its use and evidence of its effect on physical performance, and considers important factors that should determine future research efforts. To date, ten studies have assessed muscular strength and power, sub- or maximal endurance and high-intensity exercise when nicotine (medication) or smokeless tobacco was used as an intervention. Two studies observed an ergogenic effect, one an ergolytic with the remaining seven reporting no change...
August 8, 2017: Sports Medicine
https://www.readbyqxmd.com/read/28783467/the-physiological-effects-of-concurrent-strength-and-endurance-training-sequence-a-systematic-review-and-meta-analysis
#19
Zsolt Murlasits, Zsuzsanna Kneffel, Lukman Thalib
We conducted a systematic literature review and meta-analysis to assess the chronic effects of the sequence of concurrent strength and endurance training on selected important physiological and performance parameters, namely lower body 1 repetition maximum (1RM) and maximal aerobic capacity (VO2max/peak). Based on predetermined eligibility criteria, chronic effect trials, comparing strength-endurance (SE) with endurance-strength (ES) training sequence in the same session were included. Data on effect sizes, sample size and SD as well other related study characteristics were extracted...
August 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28782695/analgesics-and-sport-performance-beyond-the-pain-modulating-effects
#20
REVIEW
Darias Holgado, James Hopker, Daniel Sanabria, Mikel Zabala
Analgesics are widely used in sport to treat pain and inflammation associated with injury. However, there is growing evidence that some athletes might be taking these substances in an attempt to enhance performance. While the pharmacological action of analgesics and their use in treating pain with and without anti-inflammatory effect is well established, their effect on sport performance is debated. The aim of this review was to evaluate the evidence of whether analgesics are capable of enhancing exercise performance, and if so, to what extent...
August 3, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
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