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Wyświetlanie 1-4 z 4
Tytuł:
Effects of energy boost and springblade footwear on running economy and substrate oxidation
Autorzy:
Sinclair, Jonathan
Dillon, Stephanie
Powiązania:
https://bibliotekanauki.pl/articles/1055239.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
Running
VO2
economy
footwear
Opis:
The current study aimed to investigate the influence of energy boost, spring and conventional footwear on running economy and substrate usage. Ten male runners completed 5 min steady state runs in energy boost, spring and conventional footwear. Running economy and percent contribution of carbohydrate to total calorie expenditure were assessed. Participants also subjectively indicated which shoe condition they preferred for running. Differences between footwear were examined using repeated measures ANOVA. The results showed firstly that running economy was significantly improved in the energy return (33.36 ml.kg.min -1) compared to spring (34.83 ml.kg.min -1) and conventional footwear (34.65 ml.kg.min -1). In addition, percent carbohydrate was significantly lower in the energy return (74.51%) in comparison to the spring (78.56%) and conventional (78.52%) footwear. As running economy was improved and carbohydrate utilization reduced in the energy return footwear, this study indicates that they may be associated with improvements in running performance.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2016, 16, 4; 77-84
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of 3D kinematic and electromyographical parameters on cycling economy
Autorzy:
Sinclair, J.
Hebron, J.
Atkinson, S.
Hurst, H.
Taylor, P. J.
Powiązania:
https://bibliotekanauki.pl/articles/306495.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rower
sport
ekonomia
VO2
cycling
economy
Opis:
Purpose: Economy is considered to be a key factor for the determination of performance in endurance events such as cycling. There have been no investigations which have related cycling economy to simultaneous measurements of 3D kinematics and muscular activation. This study examined selected biomechanical and neuromuscular parameters which have the strongest association with cycling economy. Methods: Twenty-five trained cyclists (31.27±3.19 years) completed steady state cycling time trials at a workload of 180 W. Simultaneous measurements of 3D kinematics and electromyographical parameters were obtained. Continuous measurements of expired gases were used to provide a measure of cycling economy. Results: A multiple regression analysis showed that key parameters of peak knee extension velocity and mean activity of the rectus femoris muscles were significant predictors of VO2 during steady state cycling (P<0.01). Conclusion: This study has documented the key biomechanical parameters pertinent to cycling economy. As economy has been shown to influence aerobic performance, future work should focus on optimising these parameters to improve cycling economy.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 4; 91-97
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical investigation of vanadium oxide film with surface microstructure
Autorzy:
Hong, W.
Wang, Z.
Chen, Q.
Sheng, C.
Gu, G.
Luo, P.
Xie, Y.
Powiązania:
https://bibliotekanauki.pl/articles/174416.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium oxide
VO2
film
surface microstructure
photonic band edge
dispersion material
Opis:
This paper presents a method to design a surface microstructure of vanadium oxide to enhance optical absorption. This method, using a density of eigenfrequency, can be calculated by a planar wave expand method, to indicate the absorption efficiency of a dispersion material, which can be used as an approach method for further design. Based on this, a nanostructure-based vanadium oxide film is designed and simulated to validate this method. The simulation results show that the tendency of density of eigenfrequency is corresponding to the tendency of optical absorption enhancement. Moreover, this structure can achieve high optical broadband absorption when the material dispersion is considered. High optical absorption enhancement can be achieved by adjusting the geometrical parameters; our maximum overall enhancement absorption ratio was 31.84% at the metal phase, which can be attributed to the enhancement effect of a photonic band edge.
Źródło:
Optica Applicata; 2017, 47, 4; 601-609
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance on a Work-Simulating Firefighter Test Versus Approved Laboratory Tests for Firefighters and Applicants
Autorzy:
Von Heimburg, E.
Medbo, J. I.
Sandsund, M.
Reinertsen, R. E.
Powiązania:
https://bibliotekanauki.pl/articles/90966.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
endurance
fire fighting
gender
blood lactate concentration
VO2
strength tests
straż pożarna
wiek
wytrzymałość zmęczeniowa
test umiejętnościowy
strażak
doświadczenie zawodowe
Opis:
Aim. Firefighters must meet minimum physical demands. The Norwegian Labour Inspection Authority (NLIA) has approved a standardised treadmill walking test and 3 simple strength tests for smoke divers. The results of the Trondheim test were compared with those of the NLIA tests taking into account possible effects of age, experience level and gender. Methods. Four groups of participants took part in the tests: 19 young experienced firefighters, 24 senior male firefighters and inexperienced applicants, 12 male and 8 female. Results. Oxygen uptake (VO2) at exhaustion rose linearly by the duration of the treadmill test. Time spent on the Trondheim test was closely related to performance time and peak VO2 on the treadmill test. Senior experienced firefighters did not perform better than equally fit young applicants. However, female applicants performed poorer on the Trondheim test than on the treadmill test. Performance on the Trondheim test was not closely related to muscle strength beyond a minimum. Conclusion. Firefighters completing the Trondheim test in under 19 min fit the requirements of the NLIA treadmill test. The Trondheim test can be used as an alternative to the NLIA tests for testing aerobic fitness but not for muscular strength. Women’s result of the Trondheim test were poorer than the results of the NLIA treadmill test, probably because of their lower body mass.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 2; 227-243
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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