1. Muscle force loss and soreness subsequent to maximal eccentric contractions depend on the amount of fascicle strainin vivo
- Author
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Lilian Lacourpaille, Antoine Nordez, Hugo Hauraix, Sylvain Dorel, Valentin Doguet, Gaël Guilhem, Marc Jubeau, French Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance (EA7370) (SEP (EA7370)), Institut national du sport, de l'expertise et de la performance (INSEP), Motricité, interaction, performance EA 4334 (MIP), Le Mans Université (UM)-Université de Nantes - UFR des Sciences et Techniques des Activités Physiques et Sportives (UFR STAPS), Université de Nantes (UN)-Université de Nantes (UN), 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), and Le Mans Université (UM)-Centre hospitalier universitaire de Nantes (CHU Nantes)-Université de Nantes - UFR des Sciences et Techniques des Activités Physiques et Sportives (UFR STAPS)
- Subjects
Male ,Muscle fascicle ,Physiology ,[SHS.SPORT.PS]Humanities and Social Sciences/Sport/Sport physiology ,Strain (injury) ,Achilles Tendon ,03 medical and health sciences ,muscle damage ,0302 clinical medicine ,In vivo ,Elastic Modulus ,Humans ,Medicine ,Muscle Strength ,Muscle, Skeletal ,shear wave elastography ,Achilles tendon ,Muscle Weakness ,business.industry ,Work (physics) ,Myalgia ,ultrasonography ,030229 sport sciences ,Anatomy ,Fascicle ,medicine.disease ,Compliance (physiology) ,fascicle lengthening ,medicine.anatomical_structure ,Architectural gear ratio ,Physical Endurance ,Female ,business ,030217 neurology & neurosurgery ,Muscle Contraction - Abstract
International audience; Aim: Defining the origins of muscle injury has important rehabilitation and exercise applications. However, current knowledge of muscle damage mechanics in human remains unclear in vivo. This study aimed to determine the relationships between muscle–tendon unit mechanics during maximal eccentric contractions and the extent of subsequent functional impairments induced by muscle damage.Methods: The length of the muscle–tendon unit, fascicles and tendinous tissues was continuously measured on the gastrocnemius medialis using ultrasonography, in time with torque, during 10 sets of 30 maximal eccentric contractions of plantar flexors at 45°s -1, in seventeen participants.Results: Muscle–tendon unit, fascicles and tendinous tissues were stretched up to 4.44 ± 0.33 cm, 2.31 ± 0.64 cm and 1.92 ± 0.61 cm respectively. Fascicle stretch length, lengthening amplitude and negative fascicle work beyond slack length were significantly correlated with the force decrease 48 h post-exercise (r=0.51, 0.47 and 0.68, respectively; P
- Published
- 2016