Muscle Shape Changes in the Human Triceps Surae
Author Information
Author(s): Kelp Nicole Y., Tucker Kylie, Hug François, Dick Taylor J. M.
Primary Institution: University of Queensland
Hypothesis
The SOL would bulge more in thickness when the surrounding gastrocnemii muscles are less active.
Conclusion
Altering the mechanical behaviour of surrounding muscles has limited influence on changes in skeletal muscle shape.
Supporting Evidence
- Muscle activity was lower when the knee was flexed compared to extended.
- Participants maintained the same SOL EMG level during both knee conditions.
- Muscle thickness changes were not different between knee-extended and knee-flexed conditions.
Takeaway
When we change the angle of our knee, it doesn't really change how our calf muscles bulge when they work together.
Methodology
Participants performed isometric plantarflexion contractions while their muscle activity was measured using EMG and ultrasound imaging.
Limitations
The study only measured changes in muscle thickness and did not account for three-dimensional muscle bulging.
Participant Demographics
11 participants (5 females, 6 males; average age 26 years).
Statistical Information
P-Value
p=0.070
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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