%0 Journal Article
%A Sánchez-Valdepeñas Mateos-Aparicio, Juan
%A Cornejo Daza, Pedro Jesús
%A Páez-Maldonado, José
%A Rodiles Guerrero, Luis
%A Cano-Castillo, Clara
%A Piqueras-Sanchiz, Francisco
%A González Badillo, Juan José
%A Sáez de Villarreal Sáez, Eduardo
%A Pareja Blanco, Fernando
%T Acute Responses to Different Velocity-Loss Thresholds During Squat Training With and Without Blood-Flow Restriction
%D 2024
%U https://hdl.handle.net/10433/24766
%X 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.
%K Resistance training
%K Fatigue
%K Neuromuscular
%K Tensiomyography
%K Metabolic response
%K Velocity-based training
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