Acute Effects of Static and Proprioceptive Neuromuscular Facilitation Stretching of the Plantar Flexors on Ankle Range of Motion and Muscle-Tendon Behavior in Children with Spastic Cerebral Palsy—A Randomized Clinical Trial

Annika Kruse*, Andreas Habersack, Richard T. Jaspers, Norbert Schrapf, Guido Weide, Martin Svehlik, Markus Tilp

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Stretching is considered a clinically effective way to prevent muscle contracture development in children with spastic cerebral palsy (CP). Therefore, in this study, we assessed the effects of a single session of proprioceptive neuromuscular facilitation (PNF) or static stretching (SS) on ankle joint range of motion (RoM) and gastrocnemius muscle-tendon behavior in children with CP. During the SS (n = 8), the ankle joint was held in maximum dorsiflexion (30 s). During the PNF stretching (n = 10), an isometric contraction (3–5 s) was performed, followed by stretching (~25 s). Ten stretches were applied in total. We collected data via dynamometry, 3D motion capture, 2D ultrasound, and electromyography, before and after the stretching sessions. A mixed ANOVA was used for the statistical analysis. Both ankle RoM and maximum dorsiflexion increased over time (F(1,16) = 7.261, p < 0.05, η² = 0.312; and F(1,16) = 4.900, p < 0.05, η² = 0.234, respectively), without any difference between groups. An interaction effect (F(1,12) = 4.768, p = 0.05, η² = 0.284) was observed for muscle-tendon unit elongation (PNF: −8.8%; SS: +14.6%). These findings suggest a positive acute effect of stretching on ankle function. However, SS acutely increased muscle-tendon unit elongation, while this decreased after PNF stretching, indicating different effects on the spastic muscles. Whether PNF stretching has the potential to cause positive alterations in individuals with CP should be elucidated in future studies.

Original languageEnglish
Article number11599
Pages (from-to)1-12
Number of pages12
JournalInternational Journal of Environmental Research and Public Health
Volume19
Issue number18
DOIs
Publication statusPublished - 2 Sept 2022

Bibliographical note

Special Issue: Exercises and Musculoskeletal Disorders.

Funding Information:
We acknowledge the support of the Austrian Science Fund for A.K. In addition, we acknowledge the financial support of the Austrian Academy of Sciences for A.H., who is a recipient of a DOC Fellowship (25940) at the Department of Orthopaedics and Trauma, Medical University of Graz, and the Institute of Human Movement Science, Sport and Health, University of Graz. Moreover, we would like to thank Jaap Harlaar for the support in the initial project proposal writing.

Funding Information:
This work was supported by the Austrian Science Fund [Grant Number T 1017]. A.H. is currently funded by the Austrian Academy of Sciences [25940].

Publisher Copyright:
© 2022 by the authors.

Funding

We acknowledge the support of the Austrian Science Fund for A.K. In addition, we acknowledge the financial support of the Austrian Academy of Sciences for A.H., who is a recipient of a DOC Fellowship (25940) at the Department of Orthopaedics and Trauma, Medical University of Graz, and the Institute of Human Movement Science, Sport and Health, University of Graz. Moreover, we would like to thank Jaap Harlaar for the support in the initial project proposal writing. This work was supported by the Austrian Science Fund [Grant Number T 1017]. A.H. is currently funded by the Austrian Academy of Sciences [25940].

Keywords

  • Achilles tendon
  • hold-relax PNF stretching
  • muscle activity
  • paresis
  • plantar flexors
  • spasticity

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