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1. Subjective thermal strain impairs endurance performance in a temperate environment

Author:
Van Cutsem, Jeroen; Roelands, Bart; De Pauw, Kevin; Meeusen, Romain; Marcora, Samuele
Source:
Physiology & behavior 2019 v.202 pp. 36-44
ISSN:
0031-9384
Subject:
fatigue strength,   etc   ; athletes; heat; peak oxygen uptake; relative humidity; sensation;     Show all 6 Subjects
Abstract:
... The aim of this study was to test the hypothesis that subjective thermal strain can reduce endurance performance independently from the general physiological strain normally associated with impaired endurance performance in the heat.In 20 °C and 44% relative humidity, 12 endurance-trained athletes (1♀ 11♂; mean ± SD; age: 27 ± 6 y; VO2max: 61 ± 6 ml/kg/min) performed a time to exhaustion (TTE) tes ...
DOI:
10.1016/j.physbeh.2019.01.011

2. Densification, microstructure evolution and fatigue behavior of Ti-13Nb-13Zr alloy processed by selective laser melting

Author:
Zhou, Libo; Yuan, Tiechui; Li, Ruidi; Tang, Jianzhong; Wang, Guohua; Guo, Kaixuan; Yuan, Jiwei
Source:
Powder technology 2019 v.342 pp. 11-23
ISSN:
0032-5910
Subject:
fatigue strength,   etc   ; alloys; hardness; melting; microstructure; powders; tensile strength;     Show all 7 Subjects
Abstract:
... Ti-13Nb-13Zr alloy was fabricated by selective laser melting (SLM), and the densification, microstructure evolution, nanohardness, tensile strength and fatigue behavior of the alloy were systematically investigated. A narrow, feasible process window (laser power 325 W, scanning speed 1000 mm/s, scanning distance 0.13 mm, and layer thickness 0.03 mm) was accordingly determined. With the increase of ...
DOI:
10.1016/j.powtec.2018.09.073

3. Reaction kinetics approach in relation to the fatigue life of wood

Author:
Sasaki, Yasutoshi; Oya, Ayaka; Nomura, Hideaki; Yamasaki, Mariko
Source:
Wood science and technology 2018 v.52 no.3 pp. 809-820
ISSN:
0043-7719
Subject:
fatigue strength,   etc   ; durability; models; reaction kinetics; wood;     Show all 5 Subjects
Abstract:
... To evaluate the mechanical durability of wood, it is necessary to evaluate the phenomenon of fatigue progress with respect to the cumulative load process over time. Fatigue life estimation by reaction kinetics along with energetics in fatigue strength analysis is proposed based on previous studies. In this regard, based on the reaction kinetics proposed by Eyring, Liu and co-workers derived the re ...
DOI:
10.1007/s00226-018-1005-2

4. Age-related decline in endurance running performance – an example of a multiple World records holder

Author:
Lepers, Romuald; Cattagni, Thomas
Source:
Applied physiology, nutrition and metabolism 2018 v.43 no.1 pp. 98-100
ISSN:
1715-5320
Subject:
fatigue strength,   etc   ; elderly; males; running (physical activity);     Show all 4 Subjects
Abstract:
... This study examined the age-related decline in endurance running performance of one of the greatest master runners ever, Ed Whitlock, who died recently. His running performances from 1500 m to marathon were analyzed for 5 periods of 5 years from 65–69 years to 85–89 years. Despite exceptional running performances for his advanced age, the rate of decline in his performances increased after 80 year ...
DOI:
10.1139/apnm-2017-0298

5. Heart rate cost of running in track estimates velocity associated with maximal oxygen uptake

Author:
Olher, Rafael Reis; Sales, Marcelo Magalhães; Sousa, Caio Victor; Sotero, Rafael Costa; Madrid, Bibiano; Cunha, Rafael Rodrigues; Moraes, Milton Rocha; Simões, Herbert Gustavo
Source:
Physiology & behavior 2019 v.205 pp. 33-38
ISSN:
0031-9384
Subject:
fatigue strength,   etc   ; exercise; exercise test; heart rate; oxygen; peak oxygen uptake; prediction;     Show all 7 Subjects
Abstract:
... Running velocity associated with VO2max (vVO2max) is a parameter widely used for exercise prescription and is related to endurance performance. However, the vVO2max determination usually requires a maximal effort test and equipped laboratory for expired gas analysis, what make difficulty its assessment.We aimed to test the validity of a simple method of vVO2max prediction through the heart rate co ...
DOI:
10.1016/j.physbeh.2019.02.029

6. Preparation of CFRP with modified MWCNT to improve the mechanical properties and torsional fatigue of epoxy/polybenzoxazine copolymer

Author:
Chou, Tsung Yu; Tsai, Hung-Yin; Yip, Ming Chuen
Source:
Composites 2019 v.118 pp. 30-40
ISSN:
1359-835X
Subject:
fatigue strength,   etc   ; carbon nanotubes; composite polymers; delamination; epoxides; glass transition temperature; nanocomposites; storage modulus;     Show all 8 Subjects
Abstract:
... This study proposes a novel method for preparing a high-performance laminated nanocomposite that simultaneously offers low weight, high strength, long material life, high weatherability, and high environmental friendliness. 4,4-Methylene diphenyl diisocyanate (MDI) was grafted onto multiwall carbon nanotube (MWCNT) surfaces, and hot-compression exhaust method was used to prepare nanocomposites and ...
DOI:
10.1016/j.compositesa.2018.11.026

7. Beta-alanine supplementation improves isometric, but not isotonic or isokinetic strength endurance in recreationally strength-trained young men

Author:
Bassinello, Diogo; de Salles Painelli, Vitor; Dolan, Eimear; Lixandrão, Manoel; Cajueiro, Monique; de Capitani, Mariana; Saunders, Bryan; Sale, Craig; Artioli, Guilherme G.; Gualano, Bruno; Roschel, Hamilton
Source:
Amino acids 2019 v.51 no.1 pp. 27-37
ISSN:
0939-4451
Subject:
fatigue strength,   etc   ; beta-alanine; cations; endurance testing; hydrogen; males; maltodextrins; men; placebos; skeletal muscle; strength training;     Show all 11 Subjects
Abstract:
... β-Alanine (BA) supplementation may be ergogenic during high-intensity exercise, primarily due to the buffering of hydrogen cations, although the effects of beta-alanine supplementation on strength endurance are equivocal. The aim of the study was to determine the effects of 4 weeks of beta-alanine supplementation on skeletal muscle endurance using a battery of performance tests. This study employe ...
DOI:
10.1007/s00726-018-2593-8

8. Fluid balance and thermoregulatory responses of competitive triathletes

Author:
Logan-Sprenger, Heather M.
Source:
Journal of thermal biology 2019 v.79 pp. 69-72
ISSN:
0306-4565
Subject:
fatigue strength,   etc   ; ambient temperature; athletes; exercise; females; heat; males; observational studies; relative humidity; specific gravity; sweat; thermoregulation; urine; vomiting;     Show all 14 Subjects
Abstract:
... As little as 2% total body mass (BM) loss from sweat has been shown to compromise physiological functioning during prolonged exercise in the heat, subsequently compromising endurance performance. Purpose: This observational study aims to describe the fluid balance and thermoregulatory responses of competitive triathletes racing at a major international competition in a cool environment. Methods: F ...
DOI:
10.1016/j.jtherbio.2018.12.003

9. Influence of sex on performance fatigability of the plantar flexors following repeated maximal dynamic shortening contractions

Author:
Lanning, Amelia C.; Power, Geoffrey A.; Christie, Anita D.; Dalton, Brian H.
Source:
Applied physiology, nutrition and metabolism 2017 v.42 no.10 pp. 1118-1121
ISSN:
1715-5320
Subject:
fatigue strength,   etc   ; females; gender differences; males; torque;     Show all 5 Subjects
Abstract:
... The purpose was to determine sex differences in fatigability during maximal, unconstrained velocity, shortening plantar flexions. The role of time-dependent measures (i.e., rate of torque development, rate of velocity development, and rate of neuromuscular activation) in such sex-related differences was also examined. By task termination, females exhibited smaller reductions in power and similar c ...
DOI:
10.1139/apnm-2017-0013

10. The fatigue characteristics of two-pin moment-resisting dowel furniture joints with different assembly time and glueline thickness

Author:
Ratnasingam, Jegatheswaran; Ioras, Florin
Source:
European journal of wood and wood products 2015 v.73 no.2 pp. 279-281
ISSN:
0018-3768
Subject:
fatigue strength,   etc   ; furniture; wood;     Show all 3 Subjects
Abstract:
... The fatigue strength of two-pin dowel end to side-grain rubberwood furniture joints made from PVAc of different glueline thickness and joint assembly times were compared. Joints assembled immediately after machining had significantly higher strength compared to those joints assembled after 1 week and 1 month. The results showed that the allowable design stress for PVAc dowel adhesive joints of 0.0 ...
DOI:
10.1007/s00107-015-0886-0

11. Dietary sugars, exercise and hepatic carbohydrate metabolism

Author:
Gonzalez, Javier T.; Betts, James A.
Source:
Proceedings of the Nutrition Society 2019 v.78 no.2 pp. 246-256
ISSN:
1475-2719
Subject:
fatigue strength,   etc   ; athletes; athletic performance; blood glucose; dietary carbohydrate; exercise; glucose; glycemic control; glycogen; insulin resistance; lipids; liver; metabolic diseases; overweight; physiological response; polymers; repletion;     Show all 17 Subjects
Abstract:
... The present paper reviews the physiological responses of human liver carbohydrate metabolism to physical activity and ingestion of dietary sugars. The liver represents a central link in human carbohydrate metabolism and a mechanistic crux point for the effects of dietary sugars on athletic performance and metabolic health. As a corollary, knowledge regarding physiological responses to sugar ingest ...
DOI:
10.1017/S0029665118002604
PubMed:
30348238 30348238

12. Carbohydrate restriction: Friend or foe of resistance-based exercise performance?

Author:
Cholewa, Jason M.; Newmire, Daniel E.; Zanchi, Nelo Eidy
Source:
Nutrition 2019 v.60 pp. 136-146
ISSN:
0899-9007
Subject:
fatigue strength,   etc   ; aesthetics; athletes; athletic performance; biochemical pathways; carbohydrates; education programs; hypertrophy; mammals; muscles; nutrition research; phosphorylation; protein intake; protocols; rapamycin; sports; sports nutrition; strength training;     Show all 18 Subjects
Abstract:
... It is commonly accepted that adequate carbohydrate availability is necessary for optimal endurance performance. However, for strength- and physique-based athletes, sports nutrition research and recommendations have focused on protein ingestion, with far less attention given to carbohydrates. Varying resistance exercise protocols, such as differences in intensity, volume, and intraset rest prescrip ...
DOI:
10.1016/j.nut.2018.09.026

13. Do ACE and CKMM gene variations have potent effects on physical performance in inactive male adolescents?

Author:
Zehsaz, Farzad; Safabakhsh, Amir Hamzeh; Farhangi, Negin; Keynezhad, Narmin; Monfaredan, Amir; Ghahramani, Mehri
Source:
Molecular biology reports 2019 v.46 no.2 pp. 1835-1843
ISSN:
0301-4851
Subject:
fatigue strength,   etc   ; DNA; adolescents; analysis of covariance; chi-square distribution; gene frequency; genes; genotype; genotyping; males; parents; phenotype; physical activity; polymerase chain reaction;     Show all 14 Subjects
Abstract:
... We studied to ascertain whether the ACE and/or CKMM genotypes independently influence the baseline level of some sport performances in 613 inactive male adolescents (mean ± SD age: 13.24 ± 0.28 years). All DNA samples were extracted and genotyped for ACE I/D and CKMM A/G polymorphisms using a PCR based procedure. One-way analysis of covariance was used to examine the discrepancies in the research ...
DOI:
10.1007/s11033-019-04636-7

14. Effects of High vs. Low Glycemic Index of Post-Exercise Meals on Sleep and Exercise Performance: A Randomized, Double-Blind, Counterbalanced Polysomnographic Study

Author:
Vlahoyiannis, Angelos; Aphamis, George; Andreou, Eleni; Samoutis, George; Sakkas, Giorgos K.; Giannaki, Christoforos D.
Source:
Nutrients 2018 v.10 no.11
ISSN:
2072-6643
Subject:
fatigue strength,   etc   ; athletic performance; cross-over studies; glycemic index; jumping; males; sleep; volunteers;     Show all 8 Subjects
Abstract:
... The aim of the current study was to investigate the effect of the glycemic index of post-exercise meals on sleep quality and quantity, and assess whether those changes could affect the next day’s exercise performance. Following a baseline/familiarization phase, 10 recreationally trained male volunteers (23.2 ± 1.8 years) underwent two double-blinded, randomized, counterbalanced crossover trials. I ...
DOI:
10.3390/nu10111795

15. Equine Endurance Race Pacing Strategy and Performance in 120-km Single-Day Races

Author:
Marlin, David; Williams, Jane
Source:
Journal of equine veterinary science 2018 v.67 pp. 87-90
ISSN:
0737-0806
Subject:
fatigue strength,   etc   ; data collection; horse riding; horses; sports; Europe; Middle East;     Show all 7 Subjects
Abstract:
... Race pace strategy has been extensively studied in human sports such as running, cycling, and swimming. In contrast, pacing strategy appears to have been virtually ignored in equestrian sport despite its potential to contribute to performance optimization. Previously, we have demonstrated that there are significant differences in pacing strategy between finishers and nonfinishers in 120-km single- ...
DOI:
10.1016/j.jevs.2018.03.013

16. The effects of taurine on repeat sprint cycling after low or high cadence exhaustive exercise in females

Author:
Waldron, Mark; Knight, Francesca; Tallent, Jamie; Patterson, Stephen; Jeffries, Owen
Source:
Amino acids 2018 v.50 no.6 pp. 663-669
ISSN:
0939-4451
Subject:
fatigue strength,   etc   ; blood; exercise; females; heart rate; ingestion; lactic acid; maltodextrins; placebos; taurine;     Show all 10 Subjects
Abstract:
... This study investigated the effects of taurine on repeated sprint exercise, performed after fixed incremental ramp exercise to exhaustion at isokinetic high (90 r/min) or low (50 r/min) cadences. In a double-blind, repeated measures design, nine females completed an incremental ramp test to volitional exhaustion, followed by 2 min active recovery and 6 × 10 s sprints on a cycle ergometer, in one o ...
DOI:
10.1007/s00726-018-2554-2

17. l- Arginine supplementation does not improve muscle function during recovery from resistance exercise

Author:
Andrade, Walquiria Batista; Jacinto, Jeferson Lucas; da Silva, Douglas Kratki; Roveratti, Mirela Casonato; Estoche, José Maria; Oliveira, Douglas Benedito; Balvedi, Mario Carlos Welin; da Silva, Rubens Alexandre; Aguiar, Andreo Fernando
Source:
Applied physiology, nutrition and metabolism 2018 v.43 no.9 pp. 928-936
ISSN:
1715-5320
Subject:
fatigue strength,   etc   ; arginine; blood; creatine kinase; electromyography; lactic acid; muscles; strength training; young adults;     Show all 9 Subjects
Abstract:
... The purpose of this study was to investigate the effects of l-arginine supplementation on muscle recovery after a single session of high-intensity resistance exercise (RE). Twenty healthy young adult participants (22.8 ± 3.4 years old) were assigned to 1 of 2 groups (N = 10 per group): a placebo-supplement group or an l-arginine-supplement group. The groups completed a session of high-intensity RE ...
DOI:
10.1139/apnm-2017-0594

18. The role of the nervous system in neuromuscular fatigue induced by ultra-endurance exercise

Author:
Millet, Guillaume Y.; Martin, Vincent; Temesi, John
Source:
Applied physiology, nutrition and metabolism 2018 v.43 no.11 pp. 1151-1157
ISSN:
1715-5320
Subject:
fatigue strength,   etc   ; central nervous system; exercise; inflammation; muscle fatigue; muscles; sleep deprivation;     Show all 7 Subjects
Abstract:
... Ultra-endurance events are not a recent development but they have only become very popular in the last 2 decades, particularly ultramarathons run on trails. The present paper reviews the role of the central nervous system in neuromuscular fatigue induced by ultra-endurance exercise. Large decreases in voluntary activation are systematically found in ultra-endurance running but are attenuated in ul ...
DOI:
10.1139/apnm-2018-0161

19. Effect of micro-cracks on plastic zone ahead of the macro-crack tip

Author:
Xiaotao, Li; Xu, Li; Hongda, Yang; Xiaoyu, Jiang
Source:
Journal of materials science 2017 v.52 no.23 pp. 13490-13503
ISSN:
0022-2461
Subject:
fatigue strength,   etc   ; cracking; materials science; models; modulus of rupture;     Show all 5 Subjects
Abstract:
... From the macroscopic point of view, the plastic zone (PZ) is obtained based on the distributed dislocation technique (DDT) and von Mises yield criterion. From the microscopic point of view, PZ is determined by the DDT model. The effect of micro-cracks on PZ of the macro-crack tip is analyzed. The results show that the micro-crack has a little amplification effect on PZ of the macro-crack tip when ...
DOI:
10.1007/s10853-017-1440-8

20. Effects of Low Versus Moderate Glycemic Index Diets on Aerobic Capacity in Endurance Runners: Three-Week Randomized Controlled Crossover Trial

Author:
Durkalec-Michalski, Krzysztof; Zawieja, Emilia E.; Zawieja, Bogna E.; Jurkowska, Dominika; Buchowski, Maciej S.; Jeszka, Jan
Source:
Nutrients 2018 v.10 no.3
ISSN:
2072-6643
Subject:
fatigue strength,   etc   ; athletic performance; body composition; carbohydrates; cross-over studies; diet; exercise; gas exchange; glycemic index; oxidation; oxygen;     Show all 11 Subjects
Abstract:
... 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 endu ...
DOI:
10.3390/nu10030370