Reduced Active Muscle Stiffness after Intermittent Submaximal Isometric Contractions
| Autor: | Baptiste Morel, Antoine Nordez, Thibault Besson, François Hug, Thomas Lapole, Laure Mathevon, Hervé Pournot |
|---|---|
| Přispěvatelé: | Image, Modélisation, Analyse, GEométrie, Synthèse (IMAGES), Laboratoire Traitement et Communication de l'Information (LTCI), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris-Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, Motricité, interactions, performance EA 4334 / Movement - Interactions - Performance (MIP), Université de Nantes - UFR des Sciences et Techniques des Activités Physiques et Sportives (UFR STAPS), Université de Nantes (UN)-Université de Nantes (UN)-Centre hospitalier universitaire de Nantes (CHU Nantes)-Le Mans Université (UM), Institut national du sport, de l'expertise et de la performance (INSEP), Laboratoire Interuniversitaire de Biologie de la Motricité (LIBM ), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]) |
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male musculoskeletal diseases medicine.medical_specialty [SDV]Life Sciences [q-bio] Physical Therapy Sports Therapy and Rehabilitation Isometric exercise Fingers Young Adult 03 medical and health sciences 0302 clinical medicine Elastic Modulus Isometric Contraction Internal medicine medicine Humans Knee Orthopedics and Sports Medicine Muscle Skeletal ComputingMilieux_MISCELLANEOUS business.industry Stiffness 030229 sport sciences Muscle stiffness Muscle Fatigue Cardiology Elasticity Imaging Techniques Active muscle medicine.symptom business |
| Zdroj: | Medicine and Science in Sports and Exercise Medicine and Science in Sports and Exercise, American College of Sports Medicine (ACSM), 2019, 51 (12), pp.2603-2609. ⟨10.1249/MSS.0000000000002080⟩ |
| ISSN: | 1530-0315 0195-9131 |
| DOI: | 10.1249/mss.0000000000002080 |
| Popis: | Whether muscle stiffness is influenced by fatigue remains unclear. Classical methods used to assess muscle stiffness provide a global measure at the joint level. As fatigue may selectively affect specific muscles, a joint-level approach may not be sensitive enough to detect potential changes in muscle stiffness. Taking advantage of ultrasound shear wave elastography, this study aimed to determine the influence of a fatiguing protocol involving intermittent submaximal isometric contractions on muscle shear modulus (an index of stiffness).Shear modulus was measured on either the vastus lateralis (n = 9) or the abductor digiti minimi (n = 10) before and after 15 min of intermittent submaximal isometric contractions at 60% of maximal voluntary contraction (MVC) (4 s ON, 4 s OFF). An index of active muscle stiffness was estimated PRE- and POST-fatigue as the slope of the linear regression established between shear modulus and absolute joint force up to 60% MVC.After the fatiguing exercise, MVC was significantly decreased by 22% ± 7% and 32% ± 15% for knee extension and little finger abduction, respectively (P0.001). When compared to PRE-fatigue, the index of active muscle stiffness was 12% ± 15% lower for the vastus lateralis (P0.031) and 44% ± 19% lower for the abductor digiti minimi (P0.001) POST-fatigue.Although the present results cannot clearly determine the involved mechanisms, they demonstrate a decreased active muscle stiffness after a fatiguing task involving intermittent submaximal isometric contractions. Further studies should now determine whether this change in stiffness affects performance and risk of injury. |
| Databáze: | OpenAIRE |
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