Effects of velocity loss during resistance training on athletic performance, strength gains and muscle adaptations
Fernando Pareja-Blanco,David Rodríguez-Rosell,Luis Sánchez-Medina,Joaquin Sanchis-Moysi,Cecilia Dorado,Ricardo Mora-Custodio,Juan Manuel Yáñez-García,David Morales-Alamo,Ismael Perez-Suarez,Jose A. L. Calbet,Juan José González-Badillo +10 more
TLDR
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.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.read more
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Assessment of leg muscles mechanical capacities: Which jump, loading, and variable type provide the most reliable outcomes?
TL;DR: Both the strength of the F–V relationships and the reliability of their parameters were significantly higher for (1) the CMJ over the SJ, (2) the Free over the Smith loading type, and (3) the maximum over the averaged F and V variables.
Journal ArticleDOI
Skeletal muscle IL-15/IL-15Rα and myofibrillar protein synthesis after resistance exercise.
Alberto Pérez-López,James McKendry,Marcos Martin-Rincon,David Morales-Alamo,Bárbara Pérez-Köhler,David Valadés,Julia Buján,Jose A. L. Calbet,Leigh Breen +8 more
TL;DR: In conclusion, IL‐15/IL‐15Rα signaling pathway is activated in skeletal muscle in response to a session of resistance exercise.
Journal ArticleDOI
The effects of traditional, superset, and tri-set resistance training structures on perceived intensity and physiological responses
Jonathon Weakley,Jonathon Weakley,Kevin Till,Kevin Till,Dale B. Read,Dale B. Read,Gregory Roe,Gregory Roe,Joshua David Darrall-Jones,Joshua David Darrall-Jones,Padraic J. Phibbs,Padraic J. Phibbs,Ben Jones,Ben Jones +13 more
TL;DR: SS and TRI can enhance training efficiency and reduce training time, however, acute and short-term physiological responses differ between protocols.
Journal ArticleDOI
The Force-Velocity Relationship in Older People: Reliability and Validity of a Systematic Procedure
Julian Alcazar,Carlos Rodriguez-Lopez,Ignacio Ara,Ana Alfaro-Acha,Asier Mañas-Bote,Amelia Guadalupe-Grau,Francisco José García-García,Luis M. Alegre +7 more
TL;DR: Collecting mean force and velocity values against multiple loads, while monitoring the linearity of the F-V relationship, seemed to be the more adequate procedure to assess theF-V profile and muscle power in older adults.
Journal ArticleDOI
Effect of different velocity loss thresholds during a power-oriented resistance training program on the mechanical capacities of lower-body muscles
Alejandro Pérez-Castilla,Amador García-Ramos,Paulino Padial,Antonio J. Morales-Artacho,Belén Feriche +4 more
TL;DR: The results suggest that both velocity loss thresholds induce similar changes on the lower-body function, which may compromise the velocity-based approach for prescribing and monitoring the repetition volume during a power-oriented resistance training program conducted with the countermovement jump exercise.
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