title: Acute cardiorespiratory and metabolic responses during resistance exercise in the lactate threshold intensity.
abstract: The aims were both to determine lactate and ventilatory threshold during incremental resistance training and to analyze the acute cardiorespiratory and metabolic responses during constant-load resistance exercise at lactate threshold (LT) intensity. Ten healthy men performed 2 protocols on leg press machine. The incremental test was performed to determine the lactate and ventilatory thresholds through an algorithmic adjustment method. After 48 h, a constant-load exercise at LT intensity was executed. The intensity of LT and ventilatory threshold was 27.1±3.7 and 30.3±7.9% of 1RM, respectively (P=0.142). During the constant-load resistance exercise, no significant variation was observed between set 9 and set 15 for blood lactate concentration (3.3±0.9 and 4.1±1.4  mmol x L(-1), respectively. P=0.166) and BORG scale (11.5±2.9 and 13.0±3.5, respectively, P=0.783). No significant variation was observed between set 6 and set 15 for minute ventilation (19.4±4.9 and 22.4±5.5 L x min(-1), respectively, P=0.091) and between S3 and S15 for VO2 (0.77±0.18 and 0.83±0.16 L x min(-1), respectively, P=1.0). Constant-load resistance exercise at LT intensity corresponds to a steady state of ventilatory, cardio-metabolic parameters and ratings of perceived exertion.
authors: Programa de Pós-Graduação Interunidades Bioengenharia, EESC/FMRP/IQSC, USP, São Carlos, Brasil. nunosfrade@gmail.com
authors: N M F
authors: NM
authors: de Sousa
authors: R F
authors: RF
authors: Magosso
authors: G B
authors: GB
authors: Pereira
authors: M V C
authors: MV
authors: Souza
authors: A
authors: A
authors: Vieira
authors: D A
authors: DA
authors: Marine
authors: S E A
authors: SE
authors: Perez
authors: V
authors: V
authors: Baldissera
mesh_terms: D000328:Adult; D000465:Algorithms; D015308:Anaerobic Threshold / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000378:metabolism*; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D005082:Physical Exertion / Q000502:physiology; D055070:Resistance Training / Q000379:methods; D055815:Young Adult
chemical_list: D019344:Lactic Acid; D010100:Oxygen