Stretch Reflexes and Ankle Stiffness in Running
Author Information
Author(s): Cronin Neil J., Carty Christopher P., Barrett Rod S.
Primary Institution: Griffith University, Queensland, Australia
Hypothesis
High frequency Achilles tendon vibration would decrease SLR size in triceps surae muscles during running.
Conclusion
The study found that the short latency stretch reflex contributes to ankle stiffness regulation during running, particularly at slower speeds.
Supporting Evidence
- Vibration decreased SLR size at all running speeds tested.
- Ankle yielding was observed at slower running speeds when SLR was depressed.
- The SLR plays a more important role at slow to intermediate running speeds than at faster speeds.
Takeaway
When you run, your muscles have a quick response to help keep your ankle steady, and this response is affected by how fast you're going.
Methodology
Participants ran on a treadmill at different speeds with and without Achilles tendon vibration while measuring muscle activity and ankle movement.
Limitations
The study did not examine all plantar flexor muscles, which may underestimate the extent of ankle yielding.
Participant Demographics
10 healthy participants (7 males, 3 females; age 26±4 years; height 178±9 cm; body mass 71±12 kg).
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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