RT Journal Article
T1 Acute Responses to Different Velocity-Loss Thresholds During Squat Training With and Without Blood-Flow Restriction
A1 Sánchez-Valdepeñas Mateos-Aparicio, Juan
A1 Cornejo Daza, Pedro Jesús
A1 Páez-Maldonado, José
A1 Rodiles Guerrero, Luis
A1 Cano-Castillo, Clara
A1 Piqueras-Sanchiz, Francisco
A1 González Badillo, Juan José
A1 Sáez de Villarreal Sáez, Eduardo
A1 Pareja Blanco, Fernando
K1 Resistance training
K1 Fatigue
K1 Neuromuscular
K1 Tensiomyography
K1 Metabolic response
K1 Velocity-based training
AB Purpose: To compare the acute effects on mechanical, metabolic, neuromuscular, and muscle contractile responses to differentvelocity-loss (VL) thresholds (20% and 40%) under distinct blood-flow conditions (free [FF] vs restricted [BFR]) in full squat (SQ).Methods: Twenty strength-trained men performed 4 SQ protocols with 60% 1-repetition maximum that differed in the VL withinthe set and in the blood-flow condition (FF20: FF with 20% VL; FF40: FF with 40% VL; BFR20: BFR with 20% VL; and BFR40:BFR with 40% VL). The level of BFR was 50% of the arterial occlusion pressure. Before and after the SQ protocols, the followingtests were performed: (1) tensiomyography, (2) blood lactate, (3) countermovement jump, (4) maximal voluntary isometric SQcontraction, and (5) performance with the load that elicited a 1 m·s−1 at baseline measurements in SQ. Results: No “BFR × VL”interactions were observed. BFR protocols resulted in fewer repetitions and lower increases in lactate concentration than FF protocols.The 40% VL protocols completed more repetitions but resulted in lower mechanical performance and electromyography medianfrequency during the exercise than the 20% VL protocols. At postexercise, the 40% VL protocols also experienced greater bloodlactate concentrations, higher alterations in tensiomyography-derived variables, and accentuated impairments in SQ and countermovement-jump performances. The 20% VL protocols showed an increased electromyography median frequency at postexercisemaximal voluntary isometric contraction. Conclusions: Despite BFR-accelerated fatigue development during exercise, a given VLmagnitude induced similar impairments in the distinct performance indicators assessed, regardless of the blood-flow condition.
PB Human Kinetics Journals
YR 2024
FD 2024-12-05
LK https://hdl.handle.net/10433/24766
UL https://hdl.handle.net/10433/24766
LA en
NO Centro de Investigación en Rendimiento Físico y Deportivo
DS RIO
RD May 1, 2026