Comparison of blood lactate and perceived exertion responses in two matched time-under-tension protocols


Autoři: Salvador Vargas-Molina aff001;  Fernando Martín-Rivera aff003;  Diego A. Bonilla aff004;  Jorge L. Petro aff005;  Leandro Carbone aff006;  Ramón Romance aff002;  Manuel deDiego aff001;  Brad J. Schoenfeld aff007;  Javier Benítez-Porres aff002
Působiště autorů: EADE-University of Wales Trinity Saint David, Málaga, Spain aff001;  Human Kinetics and Body Composition Laboratory, University of Málaga, Málaga, Spain aff002;  Research Unit in Sports and Health, University of Valencia, Valencia, Spain aff003;  Research Division, DBSS International, Bogotá, Colombia aff004;  Research Group in Physical Activity, Sports and Health Sciences (GICAFS), Universidad de Córdoba, Montería, Colombia aff005;  University of Salvador, Buenos Aires, Argentina aff006;  Health Sciences Department, CUNY Lehman College, Bronx, NY, United States of America aff007
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0227640

Souhrn

Purpose

The aim of this study was to compare the concentration of blood lactate [bLa-] and the subjective perception of exertion of trained men in a moderate repetition protocol (MRP) versus a high repetition protocol (HRP) equated for time under tension.

Methods

A sample of 40 healthy young men (aged, 23.2 ± 4.0 years; height, 177.3 ± 7.0 cm; BMI, 24.3 ± 2.2) performed two sessions of 8 sets of bicep curls with a one-week recovery interval between the trials. In the HRP protocol, 20 repetitions were performed with a cadence of 2 seconds of eccentric and 1 second of concentric, while in the MRP protocol 10 repetitions were performed with 4 seconds of eccentric and 2 seconds of concentric. Cadences were controlled by a metronome. At the beginning and end of each of the sessions, blood lactate was taken at 2, 15, and 30 minutes, and rating of perceived exertion (OMNI-RES) was assessed immediately after completion of each session.

Results

There were [bLa-] differences between protocols in the MRP 2 min, (5.2 ±1.4); 15 min, (3.2 ±1.2); 30 min, (1.9 ±0.6); p< 0.05, and the HRP 2 min, (6.1 ±1.6); 15 min, (3.7 ±1.1); 30 min, (2.2 ±0.6); p<0.01. OMNI-RES was higher in HRP, (8.8 ±0.7) than in MRP, (7.7 ±0.9). Additionally, a correlation was found between the RPE and [bLa-] values in the HRP protocol (rs = 0.35, p < 0.01).

Conclusions

Training protocols with high times under tension promote substantial increases in metabolic stress, however, our findings indicate that HRP generates more [bLa-] than MRP. In addition, there were higher RPE values in the HRP protocol compared to MRP in single-joint exercises.

Klíčová slova:

Biosynthesis – Blood – Metabolites – Muscle proteins – Software tools – Strength training – Elbow – Muscle biochemistry


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2020 Číslo 1