Objectives: It remains unclear whether an increased intrafusal mechanical sensitivity is related to the vibration-induced performance improvement. This investigation aimed to determine the residual acute effect of whole-body vibration and its duration on pre-activation levels, short-latency stretch reflex and performance during drop jumps.
Design: Repeated measures.
Methods: Eleven amateur athletes performed a set of three 45cm-drop jumps before and during a 20min-interval following three randomized conditions: No, Low (30Hz, 5mm) and High vibration (45Hz, 5mm). Ground reaction force peak, Soleus and Vastus Lateralis short latency stretch reflex onset and amplitude were assessed during drop jumps.
Results: A significant effect for time revealed an immediate drop jump height increase after High vibration. A longer contact time also followed High vibration while no changes were detected after Low vibration. Vibration did not affect ground reaction force peak and short latency stretch reflex component.
Conclusions: High vibration constituted an intervention for improving performance although there was no evidence of increased stretch reflex responses.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jsams.2012.08.010 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Reply to: Commentary: Tonic stretch reflex threshold as a measure of disordered motor control and spasticity - A critical review.
Clin Neurophysiol
December 2024
School of Physical and Occupational Therapy, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec H3G 1Y5, Canada; Center for Interdisciplinary Research in Rehabilitation (CRIR), Montreal, Quebec, Canada.
Comment on "Tonic stretch reflex threshold as a measure of disordered motor control and spasticity - A critical review" by Levin et al. (2024).
Clin Neurophysiol
December 2024
Center for Neuroscience and Neurological Recovery, Methodist Rehabilitation Center, Jackson, MS, USA.
Voltage-sensitive calcium channels contribute to depolarization of both motor- and interneurons in animal studies, but less is known of their contribution to human motor control and whether blocking them has potential in future antispasmodic treatment in humans. Therefore, this study investigated the acute effect of Nimodipine on the transmission of human spinal reflex pathways involved in spasticity. In a double-blinded, cross-over study, we measured soleus muscle stretch- and H-reflexes, and tibialis anterior cutaneous reflexes in nineteen healthy subjects before and after Nimodipine (tab-let 60mg) or Baclofen (tablet 25mg).
View Article and Find Full Text PDFCentral mechanisms of muscle tone regulation: implications for pain and performance.
Front Neurosci
December 2024
Department of Psychology and Communication, University of Idaho, Moscow, ID, United States.
Muscle tone represents a foundational property of the motor system with the potential to impact musculoskeletal pain and motor performance. Muscle tone is involuntary, dynamically adaptive, interconnected across the body, sensitive to postural demands, and distinct from voluntary control. Research has historically focused on pathological tone, peripheral regulation, and contributions from passive tissues, without consideration of the neural regulation of active tone and its consequences, particularly for neurologically healthy individuals.
View Article and Find Full Text PDFEstimating descending activation patterns from EMG in fast and slow movements using a model of the stretch reflex.
J Neurophysiol
December 2024
Institute for Neural Computation, Ruhr-University, Bochum, Germany.
Article Synopsis
- This study investigates how the brain and spinal reflexes work together to activate muscles during arm movements, using EMG data to analyze the patterns of muscle activation.
- Findings reveal that during the initial phase of movement, brain and muscle activations align, but they start to diverge as the movement continues, displaying different patterns based on the speed of the movement.
- The results indicate that while spinal reflexes significantly contribute to movement generation, the brain must adapt its activation patterns based on the dynamics of the movement (e.g., slow vs. fast).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!