A spatially explicit model of muscle contraction explains a relationship between activation phase, power and ATP utilization in insect flight.

A spatially explicit model of muscle contraction explains a relationship between activation phase , power and ATP utilization in insect flight Bertrand

Steric blocking mechanism explains stretch activation in insect flight muscle.

O ver 60 y have elapsed since John Pringle (1) described a remarkable property of insect flight muscles: If you stretch them, after short a delay, they exert more force. This explains how insects beat their wings. The flight muscles are organized in antagonistic pairs coupled to the wing. The system is a free-running oscillator: Each time one muscle contracts, it stretches the opposing muscle, ...

Mechanical transients initiated by photolysis of caged ATP within fibers of insect fibrillar flight muscle

Kinetics of the cross-bridge cycle in insect fibrillar flight muscle have been measured using laser pulse photolysis of caged ATP and caged inorganic phosphate (Pi) to produce rapid step increases in the concentration of ATP and Pi within single glycerol-extracted fibers. Rapid photochemical liberation of 100 microM-1 mM ATP from caged ATP within a fiber caused relaxation in the absence of Ca2+...

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

Muscles produce force and power by utilizing chemical energy through ATP hydrolysis. During concentric contractions (shortening), muscles generate less force compared to isometric contractions, but consume greater amounts of energy as shortening velocity increases. Conversely, more force is generated and less energy is consumed during eccentric muscle contractions (lengthening). This relationsh...

Compare sequence of joint motion and muscle electromyography between low drive and high drive soccer instep kick

The purpose of this study was to examine the difference between two types of the soccer instep kick in temporal sequence of motion and muscle electromyography, during forward swing phase of the kick. Ten elite soccer players, volunteered as subjects in the study. To culculate the kinematics data, we used DLT method with two video camera that filmed five markers fixed on anatomical points o...