Abstract
Objective
We investigated rate-dependent depression (RDD) of the Hoffman reflex (H-reflex) in patients with amyotrophic lateral sclerosis (ALS), a degenerative disease with ventral horn involvement.
Patients and methods
In this case–control study, we enrolled 27 patients with ALS and 30 matched healthy control subjects. Clinical and electrophysiological assessments, as well as RDD in response to various stimulation frequencies (0.5 Hz, 1 Hz, 3 Hz and 5 Hz), were compared between groups. Multiple clinical and electrophysiological factors were also explored to determine any underlying associations with RDD.
Results
The ALS group showed a significant loss of RDD across all frequencies compared to the control group, most notably following 1 Hz stimulation (19.1 ± 20.3 vs. 34.0 ± 13.7%, p = 0.003). Among factors that might influence RDD, the enlargement of the motor unit potential (MUP) showed a significant relationship with RDD following multifactor analysis of variance (p = 0.007) and Pearson correlation analysis (ρ = − 0.70, p < 0.001), while various upper motor neuron manifestations were not correlated with RDD values (p > 0.05).
Conclusion
We report a loss of RDD in patients with ALS. The strong correlation detected between the RDD deficit and increased MUP suggests that RDD is a sensitive indicator of underlying spinal disinhibition in ALS.
Trial registration
ChiCTR2000038848, 10/7/2020 (retrospectively registered), http://www.chictr.org.cn/.
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Data availability
All data included in this study are available from the corresponding author upon request.
Code availability
Not applicable.
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Acknowledgements
Dr Rayaz Malik and Dr Andrew Marshall helped improve the scientific rigour of the study.
Funding
This work was supported by the Shanghai Municipal Health Commission [grant number ZHYY-ZXJHZX-1–201701]. Dr Calcutt was supported by grant #1–17-ICTS-062 from the American Diabetes Association.
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Xiajun Zhou: conceptualization, methodology, resources, writing — original draft preparation. Ze Wang: data curation, formal analysis, resources, writing — original draft preparation. Zhi Lin: data curation, methodology, formal analysis. Ying Zhu: conceptualization, data curation, methodology. Desheng Zhu: formal analysis, writing — review and editing. Chong Xie: resources, data curation, writing — review and editing. Nigel A. Calcutt: conceptualization; writing, review and editing; supervision. Yangtai Guan: supervision, project administration.
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This study was performed according to the principles of the Declaration of Helsinki, and it was approved by the Institutional Review Board of Renji Hospital, Shanghai Jiaotong University School of Medicine (#KY2020-056).
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Zhou, X., Wang, Z., Lin, Z. et al. Rate-dependent depression is impaired in amyotrophic lateral sclerosis. Neurol Sci 43, 1831–1838 (2022). https://doi.org/10.1007/s10072-021-05596-2
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DOI: https://doi.org/10.1007/s10072-021-05596-2