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Age-related changes to triceps surae muscle-subtendon interaction dynamics during walking
Push-off intensity is largely governed by the forces generated by the triceps surae (TS) muscles (gastrocnemius-GAS, soleus-SOL). During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Ach...
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Published in: | Scientific reports 2021-10, Vol.11 (1), p.21264-21264, Article 21264 |
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description | Push-off intensity is largely governed by the forces generated by the triceps surae (TS) muscles (gastrocnemius-GAS, soleus-SOL). During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Achilles tendon (AT), which is comprised of subtendons that originate from the TS muscles. We and others have revealed non-uniform displacement patterns within the AT—evidence for sliding between subtendons that may facilitate independent muscle actuation. However, in older adults, we have observed more uniform AT tissue displacements that correlate with reduced push-off intensity. Here, we employed dual-probe ultrasound imaging to investigate TS muscle length change heterogeneity (GAS–SOL) as a determinant of reduced push-off intensity in older adults. Compared to young, older adults walked with more uniform AT tissue displacements and reduced TS muscle length change heterogeneity. These muscle-level differences appeared to negatively impact push-off intensity—evidenced by between-group differences in the extent to which TS muscle length change heterogeneity correlates with mechanical output across walking tasks. Our findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscle actuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity. |
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During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Achilles tendon (AT), which is comprised of subtendons that originate from the TS muscles. We and others have revealed non-uniform displacement patterns within the AT—evidence for sliding between subtendons that may facilitate independent muscle actuation. However, in older adults, we have observed more uniform AT tissue displacements that correlate with reduced push-off intensity. Here, we employed dual-probe ultrasound imaging to investigate TS muscle length change heterogeneity (GAS–SOL) as a determinant of reduced push-off intensity in older adults. Compared to young, older adults walked with more uniform AT tissue displacements and reduced TS muscle length change heterogeneity. These muscle-level differences appeared to negatively impact push-off intensity—evidenced by between-group differences in the extent to which TS muscle length change heterogeneity correlates with mechanical output across walking tasks. Our findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscle actuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity.</description><identifier>ISSN: 2045-2322</identifier><identifier>EISSN: 2045-2322</identifier><identifier>DOI: 10.1038/s41598-021-00451-y</identifier><identifier>PMID: 34711893</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>631/443/7 ; 692/698/1671 ; 692/698/1671/1668 ; 692/698/1671/1835 ; Achilles tendon ; Achilles Tendon - physiology ; Adult ; Age ; Age Factors ; Aged ; Aging ; Ankle Joint - physiology ; Biomechanical Phenomena ; Heterogeneity ; Humanities and Social Sciences ; Humans ; Kinematics ; Middle Aged ; multidisciplinary ; Muscle, Skeletal - physiology ; Muscles ; Musculoskeletal Physiological Phenomena ; Older people ; Science ; Science (multidisciplinary) ; Tendons - physiology ; Triceps surae muscle ; Walking ; Young Adult ; Young adults</subject><ispartof>Scientific reports, 2021-10, Vol.11 (1), p.21264-21264, Article 21264</ispartof><rights>The Author(s) 2021</rights><rights>2021. 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During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Achilles tendon (AT), which is comprised of subtendons that originate from the TS muscles. We and others have revealed non-uniform displacement patterns within the AT—evidence for sliding between subtendons that may facilitate independent muscle actuation. However, in older adults, we have observed more uniform AT tissue displacements that correlate with reduced push-off intensity. Here, we employed dual-probe ultrasound imaging to investigate TS muscle length change heterogeneity (GAS–SOL) as a determinant of reduced push-off intensity in older adults. Compared to young, older adults walked with more uniform AT tissue displacements and reduced TS muscle length change heterogeneity. These muscle-level differences appeared to negatively impact push-off intensity—evidenced by between-group differences in the extent to which TS muscle length change heterogeneity correlates with mechanical output across walking tasks. Our findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscle actuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity.</description><subject>631/443/7</subject><subject>692/698/1671</subject><subject>692/698/1671/1668</subject><subject>692/698/1671/1835</subject><subject>Achilles tendon</subject><subject>Achilles Tendon - physiology</subject><subject>Adult</subject><subject>Age</subject><subject>Age Factors</subject><subject>Aged</subject><subject>Aging</subject><subject>Ankle Joint - physiology</subject><subject>Biomechanical Phenomena</subject><subject>Heterogeneity</subject><subject>Humanities and Social Sciences</subject><subject>Humans</subject><subject>Kinematics</subject><subject>Middle Aged</subject><subject>multidisciplinary</subject><subject>Muscle, Skeletal - physiology</subject><subject>Muscles</subject><subject>Musculoskeletal Physiological Phenomena</subject><subject>Older people</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><subject>Tendons - physiology</subject><subject>Triceps surae muscle</subject><subject>Walking</subject><subject>Young Adult</subject><subject>Young adults</subject><issn>2045-2322</issn><issn>2045-2322</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>PIMPY</sourceid><sourceid>DOA</sourceid><recordid>eNp9kk1v1DAQhi1ERatt_wAHFIkLl4A_E_uCVFV8VKrEpT1wshxnknpJ7MV2ivbf421KaTngy4zsx69nPC9Crwl-TzCTHxInQskaU1JjzAWp9y_QCS1ZTRmlL5_kx-gspS0uS1DFiXqFjhlvCZGKnaDv5yPUESaToa_srfEjpCqHKkdnYZeqtEQD1bwkO0Gdli6D74OvnM8Qjc2u5P3em9nZVPVLdH6sfpnpR4mn6GgwU4Kzh7hBN58_XV98ra--fbm8OL-qreA416rU2XSEKWyJ7bgyvAcrG9k0pOVS8kaBgEMvrW34gNuWDx0zYPjQYtVhyjboctXtg9nqXXSziXsdjNP3GyGO2sTsSv26EwPnQvZggHChlLSSU2ZJowTGpGuL1sdVa7d0M_QWfI5meib6_MS7Wz2GOy2FYAetDXr3IBDDzwVS1rNLFqbJeAhL0lQoTChXVBb07T_oNizRl68qlGxFablhhaIrZWNIKcLwWAzB-mAEvRpBFyPoeyPofbn05mkbj1f-jL0AbAXS7jAyiH_f_o_sb0Ufvks</recordid><startdate>20211028</startdate><enddate>20211028</enddate><creator>Clark, William H.</creator><creator>Franz, Jason R.</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><general>Nature Portfolio</general><scope>C6C</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>88A</scope><scope>88E</scope><scope>88I</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M2P</scope><scope>M7P</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PIMPY</scope><scope>PJZUB</scope><scope>PKEHL</scope><scope>PPXIY</scope><scope>PQEST</scope><scope>PQGLB</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20211028</creationdate><title>Age-related changes to triceps surae muscle-subtendon interaction dynamics during walking</title><author>Clark, William H. ; 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During walking, the TS muscles undergo different fascicle kinematics and contribute differently to biomechanical subtasks. These differences may be facilitated by the Achilles tendon (AT), which is comprised of subtendons that originate from the TS muscles. We and others have revealed non-uniform displacement patterns within the AT—evidence for sliding between subtendons that may facilitate independent muscle actuation. However, in older adults, we have observed more uniform AT tissue displacements that correlate with reduced push-off intensity. Here, we employed dual-probe ultrasound imaging to investigate TS muscle length change heterogeneity (GAS–SOL) as a determinant of reduced push-off intensity in older adults. Compared to young, older adults walked with more uniform AT tissue displacements and reduced TS muscle length change heterogeneity. These muscle-level differences appeared to negatively impact push-off intensity—evidenced by between-group differences in the extent to which TS muscle length change heterogeneity correlates with mechanical output across walking tasks. Our findings suggest that the capacity for sliding between subtendons may facilitate independent TS muscle actuation in young adults but may restrict that actuation in older adults, likely contributing to reduced push-off intensity.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>34711893</pmid><doi>10.1038/s41598-021-00451-y</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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subjects | 631/443/7 692/698/1671 692/698/1671/1668 692/698/1671/1835 Achilles tendon Achilles Tendon - physiology Adult Age Age Factors Aged Aging Ankle Joint - physiology Biomechanical Phenomena Heterogeneity Humanities and Social Sciences Humans Kinematics Middle Aged multidisciplinary Muscle, Skeletal - physiology Muscles Musculoskeletal Physiological Phenomena Older people Science Science (multidisciplinary) Tendons - physiology Triceps surae muscle Walking Young Adult Young adults |
title | Age-related changes to triceps surae muscle-subtendon interaction dynamics during walking |
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