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Resistance training does not induce uniform adaptations to quadriceps
Gerald T Mangine1, Michael J Redd2, Adam M Gonzalez3
1Exercise Science and Sport Management, Kennesaw State University, Kennesaw, Georgia, United States of America.
Plos One
|August 31, 2018
Summary
Resistance training induced non-uniform muscle adaptations in the rectus femoris and vastus lateralis. The vastus lateralis showed greater increases in cross-sectional area, while the rectus femoris experienced a decrease in fascicle length.
Area of Science:
- Exercise Physiology
- Muscle Physiology
- Biomechanics
Background:
- Muscle adaptations to resistance training can vary based on muscle architecture and training protocols.
- Uni-articular and bi-articular muscles may respond differently to mechanical stimuli.
- Understanding regional muscle changes is crucial for optimizing training interventions.
Purpose of the Study:
- To compare morphological adaptations along the length of the rectus femoris (RF) and vastus lateralis (VL) after resistance training.
- To investigate changes in muscle thickness, pennation angle, cross-sectional area, and fascicle length in response to a high-intensity, low-volume training program.
- To determine if resistance training induces region-specific adaptations within these muscles.
Main Methods:
- 15 resistance-trained men underwent an 8-week high-intensity, low-volume lower-body resistance training program.
- Muscle morphology assessments (muscle thickness, pennation angle, cross-sectional area, echo-intensity, fascicle length) were conducted pre- and post-training.
- Measurements were taken at 30%, 50%, and 70% of the RF and VL length.
Main Results:
- Significant differences in muscle adaptation were observed between the rectus femoris and vastus lateralis.
- The vastus lateralis exhibited a greater increase in average cross-sectional area compared to the rectus femoris.
- The rectus femoris showed a significant decrease in average fascicle length, while the vastus lateralis did not.
- No significant region-specific adaptations were found within either muscle.
Conclusions:
- Eight weeks of high-intensity resistance training leads to non-homogenous adaptations in muscle size and architecture between the rectus femoris and vastus lateralis.
- The observed adaptations suggest differential responses to training stimuli based on muscle characteristics.
- Training did not appear to influence region-specific adaptations within these muscles.
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