Measurements of tendon length changes during stretch–shortening cycles in rat soleus
Abstract The muscle force attained during concentric contractions is augmented by a preceding eccentric contraction (the stretch–shortening cycle (SSC) effect). At present, tendon elongation is considered the primary mechanism. However, we recently found that the magnitude of the SSC effect was not...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-04-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-32370-5 |
| _version_ | 1797850078695653376 |
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| author | Atsuki Fukutani Satoru Hashizume Tadao Isaka |
| author_facet | Atsuki Fukutani Satoru Hashizume Tadao Isaka |
| author_sort | Atsuki Fukutani |
| collection | DOAJ |
| description | Abstract The muscle force attained during concentric contractions is augmented by a preceding eccentric contraction (the stretch–shortening cycle (SSC) effect). At present, tendon elongation is considered the primary mechanism. However, we recently found that the magnitude of the SSC effect was not different, even after removing the Achilles tendon. To resolve these discrepant results, direct measurement of changes in Achille tendon length is required. Therefore, this study aimed to elucidate the influence of tendon elongation on the SSC effect by directly measuring the changes in Achilles tendon length. The rat soleus was subjected to pure concentric contractions (pure shortening trials) and concentric contractions with a preceding eccentric contraction (SSC trials). During these contractions, the Achilles tendon length was visualized using a video camera. The muscle force attained during the concentric contraction phase in the SSC trial was significantly larger than that in the pure shortening trial (p = 0.022), indicating the existence of the SSC effect. However, the changes in Achilles tendon length were not different between trials (i.e., the magnitude of tendon shortening attained during the shortening phase was 0.20 ± 0.14 mm for the SSC trial vs. 0.17 ± 0.09 mm for the pure shortening trial), indicating that the observed SSC effect is difficult to be explained by the elastic energy stored in tendons or muscle–tendon interaction. In conclusion, the effect of tendon elongation on the SSC effect should be reconsidered, and other factors may contribute to the SSC effect. |
| first_indexed | 2024-04-09T18:54:34Z |
| format | Article |
| id | doaj.art-164ba75fc93f4018bb068b647c6e283f |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-09T18:54:34Z |
| publishDate | 2023-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-164ba75fc93f4018bb068b647c6e283f2023-04-09T11:14:42ZengNature PortfolioScientific Reports2045-23222023-04-011311910.1038/s41598-023-32370-5Measurements of tendon length changes during stretch–shortening cycles in rat soleusAtsuki Fukutani0Satoru Hashizume1Tadao Isaka2Faculty of Sport and Health Science, Ritsumeikan UniversityFaculty of Sport and Health Science, Ritsumeikan UniversityFaculty of Sport and Health Science, Ritsumeikan UniversityAbstract The muscle force attained during concentric contractions is augmented by a preceding eccentric contraction (the stretch–shortening cycle (SSC) effect). At present, tendon elongation is considered the primary mechanism. However, we recently found that the magnitude of the SSC effect was not different, even after removing the Achilles tendon. To resolve these discrepant results, direct measurement of changes in Achille tendon length is required. Therefore, this study aimed to elucidate the influence of tendon elongation on the SSC effect by directly measuring the changes in Achilles tendon length. The rat soleus was subjected to pure concentric contractions (pure shortening trials) and concentric contractions with a preceding eccentric contraction (SSC trials). During these contractions, the Achilles tendon length was visualized using a video camera. The muscle force attained during the concentric contraction phase in the SSC trial was significantly larger than that in the pure shortening trial (p = 0.022), indicating the existence of the SSC effect. However, the changes in Achilles tendon length were not different between trials (i.e., the magnitude of tendon shortening attained during the shortening phase was 0.20 ± 0.14 mm for the SSC trial vs. 0.17 ± 0.09 mm for the pure shortening trial), indicating that the observed SSC effect is difficult to be explained by the elastic energy stored in tendons or muscle–tendon interaction. In conclusion, the effect of tendon elongation on the SSC effect should be reconsidered, and other factors may contribute to the SSC effect.https://doi.org/10.1038/s41598-023-32370-5 |
| spellingShingle | Atsuki Fukutani Satoru Hashizume Tadao Isaka Measurements of tendon length changes during stretch–shortening cycles in rat soleus Scientific Reports |
| title | Measurements of tendon length changes during stretch–shortening cycles in rat soleus |
| title_full | Measurements of tendon length changes during stretch–shortening cycles in rat soleus |
| title_fullStr | Measurements of tendon length changes during stretch–shortening cycles in rat soleus |
| title_full_unstemmed | Measurements of tendon length changes during stretch–shortening cycles in rat soleus |
| title_short | Measurements of tendon length changes during stretch–shortening cycles in rat soleus |
| title_sort | measurements of tendon length changes during stretch shortening cycles in rat soleus |
| url | https://doi.org/10.1038/s41598-023-32370-5 |
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