title: Skeletal muscle architectural adaptations to marathon run training.
abstract: We assessed lateral gastrocnemius (LG) and vastus lateralis (VL) architecture in 16 recreational runners before and after 12 weeks of marathon training. LG fascicle length decreased 10% while pennation angle increased 17% (p < 0.05). There was a significant correlation between diminished blood lactate levels and LG pennation angle change (r = 0.90). No changes were observed in VL. This is the first evidence that run training can modify skeletal muscle architectural features.
authors.affiliation: Human Performance Laboratory, James Madison University, Harrisonburg, VA 22807, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Murach
authors.forename: Cory
authors.initials: C
authors.lastname: Greever
authors.forename: Nicholas D
authors.initials: ND
authors.lastname: Luden
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D015331:Cohort Studies; D015444:Exercise; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging* / Q000502:physiology; D010101:Oxygen Consumption; D010807:Physical Endurance; D005082:Physical Exertion; D010865:Pilot Projects; D052097:Quadriceps Muscle / Q000000981:diagnostic imaging / Q000502:physiology; D011998:Recreation; D015203:Reproducibility of Results; D012420:Running; D013312:Stress, Physiological; D014463:Ultrasonography; D055815:Young Adult
chemical_list: D019344:Lactic Acid
keywords: angle de pennation; exercice physique; exercise; fascicle length; longueur fasciculaire; pennation angle; structure