Open AccessJournal Article
Achilles tendon material properties are greater in the jump leg of jumping athletes.
Amy J. Bayliss,Alyssa M. Weatherholt,Trent T. Crandall,Danielle L. Farmer,Jenny McConnell,Kay M. Crossley,Stuart J. Warden +6 more
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TL;DR: In this article, the authors explored the Achilles tendon adaptation by comparing properties within the jump and non-jump legs of male collegiate-level long and/or high jump (jumpers) and cross-country (controls) athletes.
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Abstract: Purpose The Achilles tendon (AT) must adapt to meet changes in demands. This study explored AT adaptation by comparing properties within the jump and non-jump legs of jumping athletes. Non-jumping control athletes were included to control limb dominance effects. Methods AT properties were assessed in the preferred (jump) and non-preferred (lead) jumping legs of male collegiate-level long and/or high jump (jumpers; n=10) and cross-country (controls; n=10) athletes. Cross-sectional area (CSA), elongation, and force during isometric contractions were used to estimate the morphological, mechanical and material properties of the ATs bilaterally. Results Jumpers exposed their ATs to more force and stress than controls (all p≤0.03). AT force and stress were also greater in the jump leg of both jumpers and controls than in the lead leg (all p 0.05). Conclusion ATs chronically exposed to elevated mechanical loading were found to exhibit greater mechanical (stiffness) and material (Young's modulus) properties.
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Citations
Why forefoot striking in minimal shoes might positively change the course of running injuries.
TL;DR: In this article, the benefits of barefoot running (typically an FFS pattern), and compare the lower extremity mechanics between FFS and RFS, are examined and the implications of these mechanical differences, in terms of injury, are discussed.
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Prospective randomized clinical trial of open operative, minimally invasive and conservative treatments of acute Achilles tendon tear
Sebastian Fischer,Christin Colcuc,Yves Gramlich,Thomas Stein,Ahmed Nabil Abdulazim,Stephanie von Welck,Reinhard Hoffmann +6 more
TL;DR: At 24-month follow-up, no significant difference can be found in patients with AATR treated operatively or conservatively and there was no correlation between the Biodex® measurement and sonographic outcome.
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Youth Distance Running: Strategies for Training and Injury Reduction.
Brian J. Krabak,Adam S. Tenforde,Irene S. Davis,Michael Fredericson,Mark A. Harrast,Pierre A. d’Hemecourt,Anthony Luke,William O. Roberts +7 more
TL;DR: Youth runners may benefit from activities that incorporate high-impact loading and multidirectional movement for optimal bone maturation, exercises to strengthen tendons and muscles, and strategies aimed at improving running biomechanics to reduce risk of injury.
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The mechanosensitive ion channel PIEZO1 is expressed in tendons and regulates physical performance
Ryosuke Nakamichi,Shang Ma,Takayuki Nonoyama,Tomoki Chiba,Ryota Kurimoto,Hiroki Ohzono,Merissa Olmer,Chisa Shukunami,Noriyuki Fuku,Guan Wang,Errol Morrison,Yannis P. Pitsiladis,Toshifumi Ozaki,Darryl D. D'Lima,Martin Lotz,Ardem Patapoutian,Hiroshi Asahara +16 more
TL;DR: Human and mouse genetic and physiological evidence revealed a critical function of tendons in physical performance, which is tightly and robustly regulated by PIEZO1 in tenocytes, promoting tendon-specific gene expression, tendon function, and physical performance.
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Acute effects of capacitive and resistive electric transfer (CRet) on the Achilles tendon
Tsubasa Bito,Yuto Tashiro,Yusuke Suzuki,Yuu Kajiwara,Hala Zeidan,Mirei Kawagoe,Takuya Sonoda,Yasuaki Nakayama,Yuki Yokota,Kanako Shimoura,Masataka Tatsumi,Kengo Nakai,Yuichi Nishida,Soyoka Yoshimi,Tadao Tsuboyama,Tomoki Aoyama +15 more
TL;DR: To investigate the acute effects of capacitive and resistive electric transfer on Achilles tendon elongation during muscle contraction, as well as the circulation in the peritendinous region, CRet significantly improved blood circulation in that region.
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References
Role of Extracellular Matrix in Adaptation of Tendon and Skeletal Muscle to Mechanical Loading
TL;DR: Full understanding of these physiological processes will provide the physiological basis for understanding of tissue overloading and injury seen in both tendons and muscle with repetitive work and leisure time physical activity.
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TL;DR: There is a rapid increase in collagen synthesis after strenuous exercise in human tendon and muscle, and the similar time course of changes of protein synthetic rates in different cell types supports the idea of coordinated musculotendinous adaptation.
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Muscle performance during maximal isometric and dynamic contractions is influenced by the stiffness of the tendinous structures
TL;DR: Data indicate that muscle output in high-force isometric and dynamic muscle actions is positively related to the stiffness of the tendinous structures, possibly by means of a more effective force transmission from the contractile elements to the bone.
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Energy-saving mechanisms in walking and running
TL;DR: It is suggested that muscles that are optimally adapted for their tasks in running should do positive work with constant efficiency, and that mammals exploit these energy-saving mechanisms.
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•Journal Article
Muscle and tendon contributions to force, work, and elastic energy savings: a comparative perspective.
TL;DR: Muscle‐tendon architecture underlies muscle function and tendons provide the majority of elastic energy savings, but elastic savings is probably constrained by the need to reduce compliance for accurate control of position.
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