Influence of muscle temperature on the contractile properties of the quadriceps muscle in humans with spinal cord injury

2000 ◽  
Vol 98 (1) ◽  
pp. 31 ◽  
Author(s):  
H.L. GERRITS ◽  
A. DE HAAN ◽  
M.T.E. HOPMAN ◽  
L.H.V. VAN DER WOUDE ◽  
A.J. SARGEANT
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Quadriceps Muscle ◽  
Contractile Properties ◽  
Muscle Temperature ◽  
Cord Injury

Influence of muscle temperature on the contractile properties of the quadriceps muscle in humans with spinal cord injury

1999 ◽  
Vol 98 (1) ◽  
pp. 31-38 ◽  
Author(s):  
H. L. GERRITS ◽  
A. DE HAAN ◽  
M. T. E. HOPMAN ◽  
L. H. V. VAN DER WOUDE ◽  
A. J. SARGEANT
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Low Frequency ◽  
Quadriceps Muscle ◽  
Contractile Properties ◽  
Muscle Temperature ◽  
Force Frequency ◽  
Cord Injury ◽  
Frequency Relationship ◽  
Relationship Of

Low muscle temperature in paralysed muscles of individuals with spinal cord injury may affect the contractile properties of these muscles. The present study was therefore undertaken to assess the effects of increased muscle temperature on the isometric contractile properties of electrically stimulated paralysed quadriceps muscles. When muscle temperature at a depth of 3 cm was increased from ∼32 °C to ∼36 °C by ultra-short-wave application, the half-relaxation time shortened and low-frequency force responses became less fused, but the maximal rate of increase in force remained unchanged. Heating had no effect upon either force decline or slowing of relaxation during fatiguing contractions. The force–frequency relationship of the paralysed quadriceps muscle was shifted to the right after the muscle was heated. Despite this shift, however, the relationship still resembled that in muscles of non-paralysed individuals, probably due to the unexplained high twitch forces. These results indicate that reduced muscle temperature in spinal-cord-injured individuals may lead to an underestimation of the changes in contractile properties in terms of relaxation rate or the degree of fusion with low-frequency stimulation. In addition, the force–frequency relationship of paralysed muscles does not accurately reflect the magnitude of these changes, even when the muscle is heated, and should therefore be treated with caution.

scholarly journals Contractile properties of the quadriceps muscle in individuals with spinal cord injury

1999 ◽  
Vol 22 (9) ◽  
pp. 1249-1256 ◽  
Author(s):  
H.L. Gerrits ◽  
A. De Haan ◽  
M.T.E. Hopman ◽  
L.H.V. van Der Woude ◽  
D.A. Jones ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Quadriceps Muscle ◽  
Contractile Properties ◽  
Cord Injury

Motor unit numbers and contractile properties after spinal cord injury

1990 ◽  
Vol 28 (4) ◽  
pp. 496-502 ◽  
Author(s):  
Jaynie F. Yang ◽  
Richard B. Stein ◽  
Jack Jhamandas ◽  
Tessa Gordon
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Motor Unit ◽  
Contractile Properties ◽  
Cord Injury
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