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Title: Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations
Authors: Pareja-Blanco, F.
RodrÍguez-Rosell, D.
Sánchez-Medina, L.
Sanchis-Moysi, J. 
Dorado, C. 
Mora-Custodio, R.
Yañez-Garcia,J. M.
Morales-Alamo, David 
Pérez-Suárez, Ismael
Calbet, J. A. L. 
González-Badillo, J. J.
UNESCO Clasification: 241106 Fisiología del ejercicio
Keywords: Muscle strength
Training to failure
Muscle hypertrophy
Fiber type
Magnetic resonance imaging
Issue Date: 2017
Journal: Scandinavian Journal of Medicine and Science in Sports 
Abstract: We compared the effects of two resistance training (RT) programs only differing in the repetition velocity loss allowed in each set: 20% (VL20) vs 40% (VL40) on muscle structural and functional adaptations. Twenty-two young males were randomly assigned to a VL20 (n=12) or VL40 (n=10) group. Subjects followed an 8-week velocity-based RT program using the squat exercise while monitoring repetition velocity. Pre- and post-training assessments included: magnetic resonance imaging, vastus lateralis biopsies for muscle cross-sectional area (CSA) and fiber type analyses, one-repetition maximum strength and full load-velocity squat profile, countermovement jump (CMJ), and 20-m sprint running. VL20 resulted in similar squat strength gains than VL40 and greater improvements in CMJ (9.5% vs 3.5%, P<0.05), despite VL20 performing 40% fewer repetitions. Although both groups increased mean fiber CSA and whole quadriceps muscle volume, VL40 training elicited a greater hypertrophy of vastus lateralis and intermedius than VL20. Training resulted in a reduction of myosin heavy chain IIX percentage in VL40, whereas it was preserved in VL20. In conclusion, the progressive accumulation of muscle fatigue as indicated by a more pronounced repetition velocity loss appears as an important variable in the configuration of the resistance exercise stimulus as it influences functional and structural neuromuscular adaptations.
ISSN: 0905-7188
DOI: 10.1111/sms.12678
Source: Scandinavian Journal of Medicine and Science in Sports [ISSN 0905-7188],v. 27 (7), p. 724-735
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