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1000
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Abstract/Summary
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<jats:title>Abstract</jats:title><jats:sec>
<jats:title>Purpose</jats:title>
<jats:p>Imbalances of muscle strength and tendon stiffness can increase the operating strain of tendons and risk of injury. Here, we used a new approach to identify muscle–tendon imbalances and personalize exercise prescription based on tendon strain during maximum voluntary contractions (ε<jats:sub>max</jats:sub>) to mitigate musculotendinous imbalances in male adult volleyball athletes.</jats:p>
</jats:sec><jats:sec>
<jats:title>Methods</jats:title>
<jats:p>Four times over a season, we measured knee extensor strength and patellar tendon mechanical properties using dynamometry and ultrasonography. Tendon micromorphology was evaluated through an ultrasound peak spatial frequency (PSF) analysis. While a control group (<jats:italic>n</jats:italic> = 12) continued their regular training, an intervention group (<jats:italic>n</jats:italic> = 10) performed exercises (3 × /week) with personalized loads to elicit tendon strains that promote tendon adaptation (i.e., 4.5–6.5%).</jats:p>
</jats:sec><jats:sec>
<jats:title>Results</jats:title>
<jats:p>Based on a linear mixed model, ε<jats:sub>max</jats:sub> increased significantly in the control group over the 9 months of observation (<jats:italic>p</jats:italic><jats:sub>Con</jats:sub> = 0.010), while there was no systematic change in the intervention group (<jats:italic>p</jats:italic><jats:sub>Int</jats:sub> = 0.575). The model residuals of ε<jats:sub>max</jats:sub>, as a measure of imbalances in muscle–tendon adaptation, demonstrated a significant reduction over time exclusively in the intervention group (<jats:italic>p</jats:italic><jats:sub>Int</jats:sub> = 0.007). While knee extensor muscle strength increased in both groups by ~ 8% (<jats:italic>p</jats:italic><jats:sub>Con</jats:sub> < 0.001, <jats:italic>p</jats:italic><jats:sub>Int</jats:sub> = 0.064), only the intervention group showed a trend toward increased normalized tendon stiffness (<jats:italic>p</jats:italic><jats:sub>Con</jats:sub> = 0.824, <jats:italic>p</jats:italic><jats:sub>Int</jats:sub> = 0.051). PSF values did not change significantly in either group (<jats:italic>p</jats:italic> > 0.05).</jats:p>
</jats:sec><jats:sec>
<jats:title>Conclusion</jats:title>
<jats:p>These results suggest that personalized exercise prescription can reduce muscle–tendon imbalances in athletes and could provide new opportunities for tendon injury prevention.</jats:p>
</jats:sec>
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1000
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Hinweis
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DeepGreen-ID: e2c438538fce443b961ce731ae055fba ; metadata provieded by: DeepGreen (https://www.oa-deepgreen.de/api/v1/), LIVIVO search scope life sciences (http://z3950.zbmed.de:6210/livivo), Crossref Unified Resource API (https://api.crossref.org/swagger-ui/index.html), to.science.api (https://frl.publisso.de/), ZDB JSON-API (beta) (https://zeitschriftendatenbank.de/api/), lobid - Dateninfrastruktur für Bibliotheken (https://lobid.org/resources/search)
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