title: Assessment of neuromuscular function after different strength training protocols using tensiomyography.
abstract: The purpose of the study was to analyze tensiomyography (TMG) sensitivity to changes in muscle force and neuromuscular function of the muscle rectus femoris (RF) using TMG muscle properties after 5 different lower-limb strength training protocols (multiple sets; DS = drop sets; eccentric overload; FW = flywheel; PL = plyometrics). After baseline measurements, 14 male strength trained athletes completed 1 squat training protocol per week over a 5-week period in a randomized controlled order. Maximal voluntary isometric contraction (MVIC), TMG measurements of maximal radial displacement of the muscle belly (Dm), contraction time between 10 and 90% of Dm (Tc), and mean muscle contraction velocities from the beginning until 10% (V10) and 90% of Dm (V90) were analyzed up to 0.5 (post-train), 24 (post-24), and 48 hours (post-48) after the training interventions. Significant analysis of variance main effects for measurement points were found for all TMG contractile properties and MVIC (p < 0.01). Dm and V10 post-train values were significantly lower after protocols DS and FW compared with protocol PL (p = 0.032 and 0.012, respectively). Dm, V10, and V90 decrements correlated significantly to the decreases in MVIC (r = 0.64-0.67, p ≤ 0.05). Some TMG muscle properties are sensitive to changes in muscle force, and different lower-limb strength training protocols lead to changes in neuromuscular function of RF. In addition, those protocols involving high and eccentric load and a high total time under tension may induce higher changes in TMG muscle properties.
authors.affiliation: Departments of 1Training and Exercise Science; 2Sport Psychology, Faculty of Sports Science, Ruhr-University Bochum, Bochum, Germany; 3School of Human Movement Studies and School of Psychology, The University of Queensland, Brisbane, Australia; 4Institute of Sports and Preventive Medicine, Saarland University, Saarbrücken, Germany; and 5Institute of Sports Science, Johannes-Gutenberg University, Mainz, Germany.
authors.forename: Rauno Á
authors.initials: RÁ
authors.lastname: de Paula Simola
authors.forename: Nico
authors.initials: N
authors.lastname: Harms
authors.forename: Christian
authors.initials: C
authors.lastname: Raeder
authors.forename: Michael
authors.initials: M
authors.lastname: Kellmann
authors.forename: Tim
authors.initials: T
authors.lastname: Meyer
authors.forename: Mark
authors.initials: M
authors.lastname: Pfeiffer
authors.forename: Alexander
authors.initials: A
authors.lastname: Ferrauti
mesh_terms: D018592:Cross-Over Studies; D005080:Exercise Test; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D053580:Muscle Strength / Q000502:physiology; D009213:Myography / Q000379:methods; D052097:Quadriceps Muscle / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D055815:Young Adult