Academic Journal
Faster early rate of force development in warmer muscle: an in vivo exploration of fascicle dynamics and muscle-tendon mechanical properties
| العنوان: | Faster early rate of force development in warmer muscle: an in vivo exploration of fascicle dynamics and muscle-tendon mechanical properties |
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| المؤلفون: | MORNAS, Adèle, Racinais, Sébastien, Brocherie, Franck, Alhammoud, Marine, Hager, Robin, Desmedt, Yanis, Guilhem, Gaël |
| المساهمون: | French Institute of Sport (INSEP), Laboratory Sport, Expertise and Performance (EA7370) (SEP (EA7370)), Institut national du sport, de l'expertise et de la performance (INSEP), UFR Sciences du Vivant Sciences - Université Paris Cité (UFR SDV UPCité), Université Paris Cité (UPCité), ASPETAR Orthopaedic and Sports Medicine Hospital Qatar |
| المصدر: | ISSN: 0002-9513 ; American Journal of Physiology ; https://hal-insep.archives-ouvertes.fr/hal-03792454 ; American Journal of Physiology, 2022, 323 (1), ⟨10.1152/ajpregu.00280.2021⟩. |
| بيانات النشر: | HAL CCSD American Physiological Society |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | muscle temperature, explosive strength, muscle-tendon interactions, forcevelocity properties, stiffness, ultrafast ultrasound, [SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], [SDV]Life Sciences [q-bio] |
| الوصف: | International audience ; Although heat exposure has been shown to increase the skeletal rate of force development (RFD), the underlying processes remain unknown. This study investigated the effect of heat on gastrocnemius medialis (GM) muscle-tendon properties and interactions. Sixteen subjects performed electrically evoked and voluntary contractions combined with ultrafast ultrasound under thermoneutral [control (CON): 25.8 ± 1.8°C, core temperature 37.0 ± 0.3°C, muscle temperature 34.0 ± 1.1°C] and passive heat exposure [hot (HOT): 47.4 ± 1.8°C, core temperature 38.4 ± 0.3°C, muscle temperature 37.0 ± 0.8°C] conditions. Maximal voluntary force changes did not reach statistical significance (−5.0 ± 11.3%, P = 0.052) whereas voluntary activation significantly decreased (−4.6 ± 8.7%, P = 0.038) in HOT. Heat exposure significantly increased voluntary RFD before 100 ms from contraction onset (+48.2 ± 62.7%; P = 0.013), without further changes after 100 ms. GM fascicle dynamics during electrically evoked and voluntary contractions remained unchanged between conditions. Joint velocity at a given force was higher in HOT (+7.1 ± 6.6%; P = 0.004) but the fascicle force-velocity relationship remained unchanged. Passive muscle stiffness and active tendon stiffness were lower in HOT than CON (P ≤ 0.030). This study showed that heat-induced increases in early voluntary RFD may not be attributed to changes in contractile properties. Late voluntary RFD was unaltered, possibly due to decreased soft tissues’ stiffness in heat. Further investigations are required to explore the influence of neural drive and motor unit recruitment in the enhancement of explosive strength elicited by heat exposure. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-03792454; https://hal-insep.archives-ouvertes.fr/hal-03792454; https://hal-insep.archives-ouvertes.fr/hal-03792454/document; https://hal-insep.archives-ouvertes.fr/hal-03792454/file/149833_1_merged_1650639996.pdf |
| DOI: | 10.1152/ajpregu.00280.2021 |
| الاتاحة: | https://hal-insep.archives-ouvertes.fr/hal-03792454 https://hal-insep.archives-ouvertes.fr/hal-03792454/document https://hal-insep.archives-ouvertes.fr/hal-03792454/file/149833_1_merged_1650639996.pdf https://doi.org/10.1152/ajpregu.00280.2021 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.D2118BB9 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1152/ajpregu.00280.2021 |
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