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European Journal of Applied Physiology

, Volume 114, Issue 2, pp 359–364 | Cite as

The effect of age on post-activation depression of the upper limb H-reflex

  • Carlo Trompetto
  • Lucio Marinelli
  • Laura Mori
  • Stefania Canneva
  • Federica Colombano
  • Elisabetta Traverso
  • Antonio Currà
  • Giovanni Abbruzzese
Original Article

Abstract

Purpose

Post-activation depression (PaD) refers to the inhibition of the H-reflex induced by a preceding conditioning stimulus able to activate the afferents mediating the H-reflex itself. PaD can be investigated assessing the frequency-related depression of the H-reflex. This parameter, which is highly correlated to the severity of spasticity, has been used in the longitudinal assessment of spastic patients, in particular to assess the effect of drugs and rehabilitation over the years. However, in such longitudinal assessment, changes observed might be age related and not only disease related. The aim of this study was to investigate the possible age effects on PaD.

Methods

The frequency-related depression of the flexor carpi radialis (FCR) H-reflex was examined in two groups of young (20 subjects; 28 ± 3 years) and aged (18 subjects; 69 ± 6 years) healthy subjects. PaD was evaluated by comparing the H-reflex amplitudes obtained with a stimulation frequency of 0.1 Hz with those obtained using higher frequencies (0.33–0.5–1–2 Hz).

Results

The results showed that frequency-related depression of the FCR H-reflex is similar in young and elderly subjects at all frequencies, with the exception of 2 Hz.

Conclusion

Our study shows that ageing does not affect the frequency-related depression of the FCR H-reflex at the frequencies of 1 Hz or lower, supporting the reliability of this method to assess PaD in the clinical practice, particularly for the longitudinal assessment of spasticity. A decrease of GABA-ergic presynaptic inhibition seems to be the more likely explanation for the age-related changes that we observed at the frequency of 2 Hz.

Keywords

H-reflex Ageing Post-activation depression Frequency-related depression Homosynaptic depression Presynaptic inhibition 

Abbreviations

PaD

Post-activation depression

FCR

Flexor carpi radialis muscle

Notes

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Carlo Trompetto
    • 1
  • Lucio Marinelli
    • 1
  • Laura Mori
    • 1
  • Stefania Canneva
    • 1
  • Federica Colombano
    • 1
  • Elisabetta Traverso
    • 1
  • Antonio Currà
    • 2
  • Giovanni Abbruzzese
    • 1
  1. 1.Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, Institute of NeurologyUniversity of GenovaGenoaItaly
  2. 2.Department of Medical-Surgical Sciences and Biotechnologies, A. Fiorini HospitalSapienza University of Rome Polo PontinoTerracinaItaly

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