R. Josephson

Publications95
h-index36
Citations3,827
Highly Influential Citations249
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Mechanical Power output from Striated Muscle during Cyclic Contraction
1.The mechanical power output of a synchronous insect muscle was determined by measuring tension as the muscle was subjected to sinusoidal length change and stimuli which occurred at selected phases…
Contraction dynamics and power output of skeletal muscle.
  • R. Josephson
  • Chemistry, Medicine
    Annual review of physiology
  • 1993
EFFECTS OF OPERATING FREQUENCY AND TEMPERATURE ON MECHANICAL POWER OUTPUT FROM MOTH FLIGHT MUSCLE
TLDR
In the tobacco hawkmoth there is a good correspondence between the conditions of temperature and cycle frequency that produce maximal mechanical power output in the muscle preparation and the thoracic temperature and wing beat frequency observed during hovering flight.
Asynchronous muscle: a primer.
The asynchronous muscles of insects are characterized by asynchrony between muscle electrical and mechanical activity, a fibrillar organization with poorly developed sarcoplasmic reticulum, a slow…
Dissecting muscle power output.
  • R. Josephson
  • Biology
    The Journal of experimental biology
  • 1 December 1999
The primary determinants of muscle force throughout a shortening-lengthening cycle, and therefore of the net work done during the cycle, are (1) the shortening or lengthening velocity of the muscle…
TEMPERATURE, MUSCLE POWER OUTPUT AND LIMITATIONS ON BURST LOCOMOTOR PERFORMANCE OF THE LIZARD DIPSOSAURUS DORSALIS
TLDR
The mechanical power output of fast-twitch fibres from the iliofibularis of the lizard Dipsosaurus dorsalis was measured over a broad body temperature range using the oscillatory work-loop technique, demonstrating that contractile events no longer limit hindlimb cycle frequency.
Contraction Dynamics of Flight and Stridulatory Muscles of Tettigoniid Insects
TLDR
Isometric contraction kinetics and force-velocity relations were examined in wing muscles of two tettigoniid insects, Neoconocephalus robustus and N. triops, and it is suggested that the relative straightness of these plots is a consequence of internal viscosity.
Extensive and intensive factors determining the performance of striated muscle.
  • R. Josephson
  • Biology
    The Journal of experimental zoology
  • 1 October 1975
TLDR
Although a number of factors have been identified which contribute to the diversity of muscle performance, it is not yet possible to account adequately for the wide range in muscle performance throughout the animal kingdom.
Determinants of force rise time during isometric contraction of frog muscle fibres
TLDR
A simulation study based on F–V properties and series compliance in frog muscle fibres indicates that if muscle activation were instantaneous, the time taken for force to rise to 50% of the plateau value would be about 60% shorter than that actually measured from living fibres.
Power output by an asynchronous flight muscle from a beetle.
TLDR
It is proposed that there is a temperature optimum for work output because increasing temperature increases the shortening velocity of the muscle, which increases the rate of positive work output during shortening, but also decreases the durations of the stretch activation and shortening deactivation that underliepositive work output.
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