scholarly journals A modified Hill muscle model that predicts muscle power output and efficiency during sinusoidal length changes

2005 ◽  
Vol 208 (15) ◽  
pp. 2831-2843 ◽  
Author(s):  
G. A. Lichtwark
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
Muscle Model ◽  
Length Changes ◽  
Muscle Power Output ◽  
Hill Muscle Model

scholarly journals Modelling Muscle Power Output in a Swimming Fish

1990 ◽  
Vol 148 (1) ◽  
pp. 395-402 ◽  
Author(s):  
JOHN D. ALTRINGHAM ◽  
IAN A. JOHNSTON
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
Fish Swimming ◽  
Active Muscle ◽  
Cycle Frequency ◽  
Fibre Bundles ◽  
Length Changes ◽  
Myoxocephalus Scorpius ◽  
Myotomal Muscle ◽  
Muscle Power Output

Intact, electrically excitable fibre bundles were isolated from the fast and slow myotomal muscle of the bullrout (Myoxocephalus scorpius L.). Power output was measured under conditions simulating their activity in a fish swimming at different speeds. Preparations were subjected to sinusoidal length changes of ±5% of resting length, and stimulated briefly during each cycle. The number and timing of stimuli were adjusted at each cycle frequency to maximise power output. Maximum power was produced at 5–7 Hz for fast fibres (25–35 W kg−1) and 2 Hz for slow fibres (5–8 Wkg−1). Under these conditions, pre-stretch of active muscle provides an important mechanism for storing potential energy for release during the shortening part of the cycle.

Scaling of muscle performance during escape responses in the fish myoxocephalus scorpius L

1998 ◽  
Vol 201 (7) ◽  
pp. 913-923 ◽  
Author(s):  
R James ◽  
I A Johnston
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
The Body ◽  
Shortening Velocity ◽  
Scaling Relationships ◽  
Muscle Shortening ◽  
Length Changes ◽  
Escape Responses ◽  
Myoxocephalus Scorpius ◽  
Muscle Power Output

Fast-starts associated with escape responses were studied in short-horn sculpin (Myoxocephalus scorpius L.), ranging from 5.5 to 32 cm in total length (L). Electromyography and sonomicrometry were used simultaneously to measure muscle activation and length changes, respectively, in the superficial layers of fast muscle in rostral myotomes. Escape responses consisted of a half tailbeat to bend the body into a C-shape (C-bend), another half tailbeat (contralateral contraction), followed by one or two more tailbeats and/or a gliding phase. The scaling relationships for both muscle strain and shortening duration differed between the C-bend and the contralateral contraction. As a result, relative muscle shortening velocity (V/V0) scaled as -1.18L1.06 for the C-bend and as 1.23L-0. 66 for the contralateral contraction. Therefore, the scaling relationships for muscle shortening velocity varied throughout the time course of the escape response. Muscle power output was determined by using the work-loop technique to subject isolated muscle fibres to in vivo strain and stimulation patterns. Plots of the instantaneous muscle forces and velocities achieved during the contralateral contraction were found to deviate from the steady-state force-velocity relationship. Maximum instantaneous muscle power output was independent of body size, with mean maximum values of 307 and 222 W kg-1 wet muscle mass for the C-bend and the contralateral contraction, respectively. <P>

scholarly journals Effects of cross-bridge compliance on the force-velocity relationship and muscle power output

PLoS ONE ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. e0190335 ◽  
Author(s):  
Axel J. Fenwick ◽  
Alexander M. Wood ◽  
Bertrand C. W. Tanner
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
Cross Bridge ◽  
Velocity Relationship ◽  
Force Velocity ◽  
Muscle Power Output

Role of muscle power output as a mediator between gait variability and gait velocity in hospitalized older adults

2019 ◽  
Vol 124 ◽  
pp. 110631 ◽  
Author(s):  
Mikel L. Sáez de Asteasu ◽  
Nicolás Martínez-Velilla ◽  
Fabricio Zambom-Ferraresi ◽  
Álvaro Casas-Herrero ◽  
Robinson Ramirez-Vélez ◽  
...  
Keyword(s):  
Older Adults ◽  
Power Output ◽  
Muscle Power ◽  
Gait Variability ◽  
Gait Velocity ◽  
Hospitalized Older Adults ◽  
Muscle Power Output

Listening to Music Affects Diurnal Variation in Muscle Power Output

2011 ◽  
Vol 33 (01) ◽  
pp. 43-47 ◽  
Author(s):  
H. Chtourou ◽  
A. Chaouachi ◽  
O. Hammouda ◽  
K. Chamari ◽  
N. Souissi
Keyword(s):  
Diurnal Variation ◽  
Power Output ◽  
Muscle Power ◽  
Muscle Power Output
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