Effect of cooling on H- and T-reflexes in normal subjects

K. R. Bell, J. F. Lehmann

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

The local application of cold has been used to decrease spasticity and facilitate neuromuscular function, but previous attempts to identify its effect on the stretch reflex have not been entirely successful. We examined the effects of cold on the Hoffmann (H) reflex and on the tendon tap (T) reflex in 16 subjects. A series of H/M recruitment curves and T-reflexes were recorded via surface EMG electrodes before and during cooling of the triceps surae. Skin and intramuscular temperatures were recorded with average decreases of 18.4C and 12.1C, respectively. Peak-to-peak amplitude of the M, H, and T compound action potentials (CAPs) was measured. In all cases, the amplitude of the maximal M-wave decreased (p < 0.001) in response to cooling. These changes in the recording of CAPs should be considered when cooling experiments result in alterations in H or T waveforms. When using the M-wave as a covariant in our analysis, there were no significant changes in the H-reflex amplitude; the height of CAPs elicited by T decreased (p = 0.025). Our findings do not support earlier claims that simple cooling facilitates the excitatory alpha motoneuron pool as measured by the H-reflex; we do confirm that muscle spindle activity, as measured by the T-reflex, is decreased by muscle cooling.

Original languageEnglish (US)
Pages (from-to)490-493
Number of pages4
JournalArchives of Physical Medicine and Rehabilitation
Volume68
Issue number8
StatePublished - 1987

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H-Reflex
Action Potentials
Reflex
Muscle Spindles
Stretch Reflex
Abnormal Reflexes
Skin Temperature
Motor Neurons
Tendons
Electrodes
Muscles

ASJC Scopus subject areas

  • Rehabilitation

Cite this

Effect of cooling on H- and T-reflexes in normal subjects. / Bell, K. R.; Lehmann, J. F.

In: Archives of Physical Medicine and Rehabilitation, Vol. 68, No. 8, 1987, p. 490-493.

Research output: Contribution to journalArticle

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