title: Neuromuscular Responses to 14 Weeks of Traditional and Daily Undulating Resistance Training.
abstract: This study compared traditional (TP) and daily undulating (DUP) periodization on muscle strength, EMG-estimated neural drive and muscle architecture of the quadriceps femoris (QF). 10 non-athletic females (24.4±3.2 years) performed 14 weeks of isometric training for the QF exercising 1 leg using TP and the contralateral leg using DUP. Intensities varied from 60% to 80% of MVC and the intensity zones and training volume were equated for each leg. Knee extension MVC, maximal voluntary QF-EMG activity and vastus lateralis (VL) muscle architecture were measured in both legs before, after 6 weeks and after 14 weeks of training using dynamometry, surface EMG and ultrasonography. Isometric MVC and maximal QF-EMG remained unaltered after 6 weeks of training, but were significantly (P<0.05) enhanced after 14 weeks in both legs (MVC: TP 24%, DUP 23%; QF-EMG: TP 45%, DUP 46%). VL-architecture remained unchanged following 6 weeks of training, but VL-muscle thickness (TP 17%, DUP 16%) and fascicle length (TP 16%, DUP 17%) displayed significant (P<0.05) enlargements after 14 weeks in both legs. Importantly, these temporal neuromuscular alterations displayed no significant differences between the training legs. Therefore, periodization may not act as a key trigger for neuromuscular adaptations.
authors.affiliation: Department of Biomechanics and Training Science, Olympic Training and Testing Center Rheinland-Pfalz/Saarland, Bad Kreuznach, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Ullrich
authors.affiliation: Theory and Practical Performance of Physical Activities, JGU University of Mainz, Mainz, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Holzinger
authors.affiliation: Theory and Practical Performance of Physical Activities, JGU University of Mainz, Mainz, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Soleimani
authors.affiliation: Department of Biomechanics and Training Science, Olympic Training and Testing Center Rheinland-Pfalz/Saarland, Bad Kreuznach, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Pelzer
authors.affiliation: Sports Medicine, Hospital kreuznacher diakonie, Bad Kreuznach, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Stening
authors.affiliation: Theory and Practical Performance of Physical Activities, JGU University of Mainz, Mainz, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Pfeiffer
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D007719:Knee Joint / Q000502:physiology; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer; D052097:Quadriceps Muscle / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*; D055815:Young Adult