Contracture and twitch potentiation of fast and slow muscles of the rat at 20 and 37 C

Isaacson, Allen; Hinkes, MJ; Taylor, S. R.

doi:10.1152/ajplegacy.1970.218.1.33

Cited by 69 publications

(42 citation statements)

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“…The saline pH was monitored in the muscle chamber in four experiments, by means of a pH electrode connected to a digital meter (PHM 2, Petracourt). The complete range of pH recorded in these experiments for temperatures ranging from 36 to 10 0C was 7-54-7-2, which is close to what is expected on the basis of theoretical considerations (Creese, Scholes & Taylor, 1958;Isaacson, Hinkes & Taylor, 1970).…”

Section: Introductionsupporting

confidence: 88%

The force‐velocity relation of rat fast‐ and slow‐twitch muscles examined at different temperatures.

Ranatunga¹

1984

The Journal of Physiology

174

183

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SUMMARY1. The steady-state force-velocity relation was examined at temperatures between 35 and 10 0C in rat fast-twitch (extensor digitorum longus, e.d.l.) and slow-twitch soleuss) muscle preparations in vitro, with direct stimulation, and employing the isotonic release technique.2. The curvature of the force-velocity relation increased with cooling in both muscles; the increase was more pronounced below 25 'C. 4. The maximum rate ofisometric tetanic tension rise had a temperature sensitivity similar to the maximum velocity of shortening in each muscle type.

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Section: Introductionsupporting

confidence: 88%

The force‐velocity relation of rat fast‐ and slow‐twitch muscles examined at different temperatures.

Ranatunga¹

1984

The Journal of Physiology

174

183

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“…The pH of the solution was around 7-4 at room temperature. The estimated pH change for the temperature range from 35 to 10 0 was less than 0 3 pH units (see Isaacson, Hinkes & Taylor, 1970). Other relevant information regarding the method of stimulation, the measurement of peak tension and maximum rate of tension development, as well as the control, variation and measurement of saline temperature are given in the previous paper (Ranatunga, 1982).…”

Section: Methodsmentioning

confidence: 98%

Temperature‐dependent transitions in isometric contractions of rat muscle.

Ranatunga¹,

Wylie²

1983

The Journal of Physiology

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SUMMARY1. The effect of temperature on tetanic tension development was examined in extensor digitorum longus (fast-twitch) and soleus (slow-twitch) muscles of the rat, in vitro and with direct stimulation. The temperature range was from 35 to 10 'C.2. The maximum tetanic tension decreased slightly on cooling from 35 to 25 'C. Cooling below 20 'C resulted in a marked depression of tetanic tension. The results were similar in the two muscles.3. Analysis (in the form of Arrhenius plots) of the rate of tetanic tension development and relaxation clearly showed the occurrence of two phases in their temperature dependence, due to an increased temperature sensitivity below about 25 'C. Arrhenius activation energy estimates for temperatures lower than 21 'C were around twice as high as those for temperatures higher than 24 'C in both muscles.

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“…For example, Ca release from SR in slow fibers is less inhibited by cytosolic Mg (761), and this might contribute to a lower sensitivity to fatigue as an increase of intracellular Mg concentrations occur during advanced stages of fatigue. The response to caffeine, which offers a convenient way to bypass voltage-controlled calcium release and activate directly calcium release from RyR, is greater in slow than in fast muscles (369). The greater responsiveness to caffeine of slow compared with fast muscle fibers has been confirmed on glycerol-treated single fibers (229, 689).…”

Section: Calcium Release From Srmentioning

confidence: 99%

Fiber Types in Mammalian Skeletal Muscles

Schiaffino

Reggiani

2011

Physiological Reviews

2,319

2,465

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Mammalian skeletal muscle comprises different fiber types, whose identity is first established during embryonic development by intrinsic myogenic control mechanisms and is later modulated by neural and hormonal factors. The relative proportion of the different fiber types varies strikingly between species, and in humans shows significant variability between individuals. Myosin heavy chain isoforms, whose complete inventory and expression pattern are now available, provide a useful marker for fiber types, both for the four major forms present in trunk and limb muscles and the minor forms present in head and neck muscles. However, muscle fiber diversity involves all functional muscle cell compartments, including membrane excitation, excitation-contraction coupling, contractile machinery, cytoskeleton scaffold, and energy supply systems. Variations within each compartment are limited by the need of matching fiber type properties between different compartments. Nerve activity is a major control mechanism of the fiber type profile, and multiple signaling pathways are implicated in activity-dependent changes of muscle fibers. The characterization of these pathways is raising increasing interest in clinical medicine, given the potentially beneficial effects of muscle fiber type switching in the prevention and treatment of metabolic diseases.

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Contracture and twitch potentiation of fast and slow muscles of the rat at 20 and 37 C

Cited by 69 publications

References 0 publications

The force‐velocity relation of rat fast‐ and slow‐twitch muscles examined at different temperatures.

The force‐velocity relation of rat fast‐ and slow‐twitch muscles examined at different temperatures.

Temperature‐dependent transitions in isometric contractions of rat muscle.

Fiber Types in Mammalian Skeletal Muscles

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