Abstract
Purpose
Considerable debate exists as to whether increases in strength that occur with resistance exercise are the result of increases in muscle size. Most studies have attempted to answer this question using assessments of whole muscle size and voluntary muscle strength, but examining changes at the individual muscle fiber level may also provide some insight. The purpose of this meta-analysis was to compare adaptations at the whole muscle and individual fiber level.
Methods
A meta-analysis was conducted in February, 2018 including all previously published papers and was analyzed using a random effects model.
Results
There were no differences (p = 0.88) when comparing hypertrophy at the whole muscle (4.6%) and individual fiber level (7.0%), but significantly larger (p < 0.001) strength gains were observed at the whole muscle level (43.3%) relative to the individual fiber (19.5%). Additionally, there was an increase in the specific tension of type 1 muscle fibers (p = 0.013), but not type 2 muscle fibers (p = 0.23) which was driven by similar increases in strength (type 1: 17.5%, type 2A: 17.7%), despite differences in muscle size (type 1: 6.7%, type 2A: 12.1%).
Conclusion
These results support the hypothesis that the neural adaptations play a large role in increasing isotonic whole muscle strength, but also demonstrate that an improvement in specific tension of type 1 muscle fibers is present. These results would suggest that some mechanism intrinsic to the muscle fiber, and independent of muscle growth, may also be contributing to strength increases in response to resistance exercise providing an avenue for future research.
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Abbreviations
- 1RM:
-
One-repetition maximum
- CT:
-
Computed tomography
- MRI:
-
Magnetic resonance imaging
- MVC:
-
Maximal voluntary contraction
- NIH:
-
National Institute of Health
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SJD drafted the manuscript and performed the statistical analysis; JPL designed the study and revised the manuscript for intellectual content; MK assisted with the analysis and revised the manuscript for intellectual content; TA revised the manuscript for intellectual content.
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Communicated by Guido Ferretti.
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Dankel, S.J., Kang, M., Abe, T. et al. Resistance training induced changes in strength and specific force at the fiber and whole muscle level: a meta-analysis. Eur J Appl Physiol 119, 265–278 (2019). https://doi.org/10.1007/s00421-018-4022-9
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DOI: https://doi.org/10.1007/s00421-018-4022-9