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Wyszukujesz frazę "motor unit" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Evidence for the invalidity of the Wingate test for the assessment of peak power, power decrement and muscular fatigue
Autorzy:
Robergs, Robert A
Kennedy, David
Gibson, Ann L.
Zuhl, Micah
Hsu, Hung-Sheng
Beam, Jason
Salgado, Roy M.
White, Ailish C.
Majumdar, Aditi
Lawson, Steve
Estrada, Edson
Sierra, Gustavo
Powiązania:
https://bibliotekanauki.pl/articles/1054919.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
cadence
ergometry
fatigue
force
motor unit recruitment
Opis:
We hypothesized that the protocol-induced initial cadence of the WAnT is too high to allow high muscle force production and peak power generation. Twenty endurance, strength or power trained subjects (9 male, 11 female) completed two 30 s maximal exertion stationary cycle ergometer tests involving the traditional peak cadence start (TRAD) vs. a stationary start (STAT). Inertia corrected mechanical power, cadence, EMG from the vastus lateralis, and applied force to the pedals were measured continuously throughout both tests. Peak power was higher during TRAD; 11.32 ±1.41 vs. 10.40 ±1.35 Watts/kg (p < 0.0001), as was peak cadence; 171.4 ±16.3 vs. 120.9 ±15.1 rev/min (p < 0.0001). However, during TRAD EMG root mean squared (rms) increased continuously throughout the test, force applied to the pedals increased from 1 to 3 s (0.73 ±0.27 vs. 0.90 ±0.39 N/kg; p = 0.02) and thereafter remained relatively stable. EMG mean frequency also increased from 1 to 3 s, but then decreased throughout the remainder of the test. During TRAD, mechanical power decreased near immediately despite increasing EMG rms, EMGmean frequency and force application to the pedals. The initial 10 s of data from the WAnT is invalid. We recommend that intense cycle ergometer testing should commence with a stationary start.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2015, 10, 2; 63-78
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of increasing and decreasing frequency of stimulation on the contraction of motor units in rat medial gastrocnemius muscle
Autorzy:
Celichowski, J.
Bichler, E.
Powiązania:
https://bibliotekanauki.pl/articles/71036.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
motor unit
stimulation
motoneuron
gastrocnemius muscle
tension
rat
contraction
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanisms underlying the regulation of motor unit contraction in the skeletal muscle
Autorzy:
Celichowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/69858.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
muscle fibre
motor unit contraction
motoneuron
regulation
tension regulation
skeletal muscle
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between the tension-time area and the frequency of stimulation in motor units of the rat medial gastrocnemius muscle
Autorzy:
Celichowski, J.
Grottel, K.
Bichler, E.
Powiązania:
https://bibliotekanauki.pl/articles/70129.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
motor unit
tension-time area
medial gastrocnemius muscle
motoneuron
tetanic tension
rat
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of training status and muscle action on muscle activation of the vastus lateralis
Autorzy:
Trevino, M. A.
Herda, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/307528.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elektromiografia
aktywność mięśni
bioinżynieria
electromyography
isometric trapezoidal muscle action
log-transform method
motor unit control
vastus laterali
Opis:
This study examined the electromyographic amplitude–force relationships for 5 (age = 19.20 ± 0.45 yrs) aerobically-trained, 5 (age = 25 ± 4.53 yrs) resistance-trained, and 5 (age = 21.20 ± 2.17 yrs) sedentary individuals. Participants performed an isometric trapezoidal muscle action at 60% maximal voluntary contraction of the leg extensors that included linearly increasing, steady force, and linearly decreasing muscle actions. Electromyography was recorded from the vastus lateralis. The b (slopes) and a (y-intercepts) terms were calculated from the natural log-transformed electromyographic amplitude–force relationships (linearly increasing and decreasing segments) for each participant. An average of the electromyographic amplitude was calculated for the entire steady force segment. The b terms for the resistance-trained (1.384 ± 0.261) were greater than the aerobically-trained (0.886 ± 0.130, P = 0.003) and sedentary (0.955 ± 0.105, P = 0.008) participants during the linearly increasing segment, whereas, there were no differences in b terms among training statuses for the linearly decreasing segment. The b terms for the resistance-trained were greater (P = 0.019) during the linearly increasing segment than decreasing segment (1.186 ± 0.181), however, the b terms for the aerobically-trained were lower (P = 0.017) during the linearly increasing than decreasing segment (1.054 ± 0.176). The a terms from the log-transformed electromyographic amplitude–force relationships and electromyographic amplitude during the steady force segment were not different among training statuses (P = 0.187, P = 0.910). The linearity of the electromyographic amplitude patterns of response (b terms) recording during increasing and decreasing muscle actions may provide insight on motor unit control strategy differences as a result of exercise training status and muscle action, however, the a terms of these patterns and electromyographic amplitude during a steady force contraction did not distinguish among training statuses.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 4; 107-114
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantification of motor abilities during the execution of judo techniques
Autorzy:
Frassinelli, Stefano
Niccolai, Alessandro
Zich, Riccardo E.
Rosso, Valeria
Gastaldi, Laura
Powiązania:
https://bibliotekanauki.pl/articles/949742.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
IMU
dżudo
zdolności motoryczne
sztuki walki
inertial measurement unit (IMU)
sport performance
judo
martial art
motor abilities
motor capabilities
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 3; 3-12
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances
Autorzy:
Śliwiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/259706.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
flow in clearances
commutation unit
satellite motor
degree of flow laminarity
water
oil
Opis:
The article describes the flow rates of mineral oil and water flowing, as working media, through the commutation unit of a hydraulic satellite motor. It is demonstrated that geometrical dimensions of commutation unit clearances change as a function of the machine shaft rotation angle. Methods for measuring the rate of this flow and the pressure in the working chamber are presented. The results of pressure measurements in the working chamber during the transition from the filling cycle to the emptying cycle are included. The pressure in the motor’s working chamber changes linearly as a function of the shaft rotation angle, which has a significant effect on the leakage in the commutation unit clearances. The paper presents new mathematical formulas in the form: Q=f(Δpγ) to calculate the flow rate of water and mineral oil in the commutation unit clearances. The γ factor is described as a function of fluid viscosity and clearance length (the motor shaft rotation angle). The coefficients used in these formulas were determined based on the results of laboratory tests of a motor supplied with water and mineral oil.
Źródło:
Polish Maritime Research; 2017, 3; 58-67
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rational design of rotor of the asynchronous motor fan for cooling units of diesel locomotives
Racionalnaja konstrukcija rotora asinkhronnogo reguliruemogo motor-ventiljatora dlja okhlazhdajushhikh ustrojjstv teplovozob
Autorzy:
Zakharchuk, I.
Zakharchuk, O.
Bukhtiyarov, I.
Powiązania:
https://bibliotekanauki.pl/articles/793084.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
asynchronous motor fan
rotor
cooling unit
diesel locomotive
speed control
comparative analysis
experimental study
rational design
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of electrical parameters of an internal combustion engine to determine the state of Its efficiency and ecological level
Autorzy:
Olszowiec, P.
Luft, M.
Łukasik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1841600.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
internal combustion engine
electrical parameters
industrial automation
electrical motor
propulsion unit
New European driving cycle
particulate matter
Opis:
The article presents an analysis of research on a series of passenger vehicles equipped with diesel and spark-ignition engines of modern generation. These studies show the attempt to determine the consistency of the measurement results presented by the electrical motor with respect to the external direct measurements determining the level ecological driving unit such as a gas analyzer. The premise of this material is to assess the suitability of the read actual parameters sent by the ECU as the data source the level of organic vehicle, for example. The test for diagnostic station with annual regular reviews. The inspiration for the material was the attempt to determine the sensitivity of the self-diagnosis system of the propulsion unit, which correctness of the diagnosis itself is one of the criteria of the positive periodic test guidelines.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 649-652
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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