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Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats
Tendon strain during exercise is a critical regulatory factor in tendon adaptive responses and there are indications for an optimal range of strain that promotes tendon adaptation. Back squats are used to improve patellar tendon properties in sport and clinical settings. To date, the operating patel...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10226975/ https://www.ncbi.nlm.nih.gov/pubmed/37248376 http://dx.doi.org/10.1038/s41598-023-35441-9 |
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author | Weidlich, K. Mersmann, F. Domroes, T. Schroll, A. Bohm, S. Arampatzis, A. |
author_facet | Weidlich, K. Mersmann, F. Domroes, T. Schroll, A. Bohm, S. Arampatzis, A. |
author_sort | Weidlich, K. |
collection | PubMed |
description | Tendon strain during exercise is a critical regulatory factor in tendon adaptive responses and there are indications for an optimal range of strain that promotes tendon adaptation. Back squats are used to improve patellar tendon properties in sport and clinical settings. To date, the operating patellar tendon strain during back squats is unknown and current recommendations for individual exercise loading are based on the one repetition maximum (1RM). Here, we quantified patellar tendon strain during loaded back squats at 40, 60 and 80% of the 1RM and during maximum isometric knee extension contractions (MVC) using ultrasonography. Kinematics, ground reaction forces and muscle electromyographic activity were also recorded. Additionally, maximum tendon strain during the MVC and the percentage of 1RM were used as explanatory variables to estimate the individual patellar tendon strain during the squats. Strain increased with increasing 1RM loading (4.7 to 8.2%), indicating that already medium-loading back squats may provide a sufficient stimulus for tendon adaptation. The individual variability was, however, too high to generalize these findings. Yet, there was a high agreement between the individually estimated and measured patellar tendon strain (R(2) = 0.858) during back squats. We argue that this approach may provide new opportunities for personalized tendon exercise. |
format | Online Article Text |
id | pubmed-10226975 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-102269752023-05-31 Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats Weidlich, K. Mersmann, F. Domroes, T. Schroll, A. Bohm, S. Arampatzis, A. Sci Rep Article Tendon strain during exercise is a critical regulatory factor in tendon adaptive responses and there are indications for an optimal range of strain that promotes tendon adaptation. Back squats are used to improve patellar tendon properties in sport and clinical settings. To date, the operating patellar tendon strain during back squats is unknown and current recommendations for individual exercise loading are based on the one repetition maximum (1RM). Here, we quantified patellar tendon strain during loaded back squats at 40, 60 and 80% of the 1RM and during maximum isometric knee extension contractions (MVC) using ultrasonography. Kinematics, ground reaction forces and muscle electromyographic activity were also recorded. Additionally, maximum tendon strain during the MVC and the percentage of 1RM were used as explanatory variables to estimate the individual patellar tendon strain during the squats. Strain increased with increasing 1RM loading (4.7 to 8.2%), indicating that already medium-loading back squats may provide a sufficient stimulus for tendon adaptation. The individual variability was, however, too high to generalize these findings. Yet, there was a high agreement between the individually estimated and measured patellar tendon strain (R(2) = 0.858) during back squats. We argue that this approach may provide new opportunities for personalized tendon exercise. Nature Publishing Group UK 2023-05-29 /pmc/articles/PMC10226975/ /pubmed/37248376 http://dx.doi.org/10.1038/s41598-023-35441-9 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Weidlich, K. Mersmann, F. Domroes, T. Schroll, A. Bohm, S. Arampatzis, A. Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title | Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title_full | Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title_fullStr | Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title_full_unstemmed | Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title_short | Quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
title_sort | quantification of patellar tendon strain and opportunities for personalized tendon loading during back squats |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10226975/ https://www.ncbi.nlm.nih.gov/pubmed/37248376 http://dx.doi.org/10.1038/s41598-023-35441-9 |
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