title: Effect of contraction mode of slow-speed resistance training on the maximum rate of force development in the human quadriceps.
abstract: This study examined the effects of slow-speed resistance training involving concentric (CON, n = 10) versus eccentric (ECC, n = 11) single-joint muscle contractions on contractile rate of force development (RFD) and neuromuscular activity (EMG), and its maintenance through detraining. Isokinetic knee extension training was performed 3 x week(-1) for 10 weeks. Maximal isometric strength (+11.2%) and RFD (measured from 0-30/50/100/200 ms, respectively; +10.5%-20.5%) increased after 10 weeks (P < 0.01-0.05); however, there was no effect of training mode. Peak EMG amplitude and rate of EMG rise were not significantly altered with training or detraining. Subjects with below-median normalized RFD (RFD/MVC) at 0 weeks significantly increased RFD after 5- and 10-weeks training, which was associated with increased neuromuscular activity. Subjects who maintained their higher RFD after detraining also exhibited higher activity at detraining. Thus, only subjects with a lesser ability to rapidly attain their maximum force before training improved RFD with slow-speed resistance exercise.
authors.affiliation: School of Exercise, Biomedical and Health Sciences, Edith Cowan University, 100 Joondalup Drive, Joondalup, WA 6027, Australia. a.blazevich@ecu.edu.au
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Blazevich
authors.forename: Sara
authors.initials: S
authors.lastname: Horne
authors.forename: Dale
authors.initials: D
authors.lastname: Cannavan
authors.forename: David R
authors.initials: DR
authors.lastname: Coleman
authors.forename: Per
authors.initials: P
authors.lastname: Aagaard
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D004576:Electromyography / Q000379:methods; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D007717:Knee / Q000294:innervation; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D053580:Muscle Strength / Q000502:physiology*; D052097:Quadriceps Muscle / Q000502:physiology*; D013223:Statistics as Topic; D013997:Time Factors