Efecto del foco atencional en la sentadilla sobre la producción de lactato y la percepción del esfuerzo percibido en hombres (Effect of attentional focus on squats on lactate production and rating of perceived exertion in trained men)




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Keywords: Mind-muscle, muscle hypertrophy, internal focus, mind-muscle connection, resistance training


El objetivo de este estudio fue investigar el efecto del foco interno (FI) y del foco externo (FE) sobre la producción de lactato y la percepción del esfuerzo percibido en la sentadilla en hombres entrenados en fuerza. Métodos: Trece hombres con experiencia en el entrenamiento de fuerza (edad =22,61 ± 1,19 años; altura = 180 ± 6,55 cm; masa corporal = 79,38 ± 5,57 kg; IMC = 24,56 ± 2,11 kg-m-2; sentadilla = 129 ± 20 kg) realizaron dos sesiones, separadas por una semana, que comprendían 3 series de 10 repeticiones de la sentadilla con un minuto de descanso entre series. Durante el protocolo de FI, los participantes fueron instruidos para concentrarse en tensar los cuádriceps durante todas las repeticiones, mientras que los participantes en el EF fueron instruidos para concentrarse en levantar la barra. Se tomaron muestras de lactato en sangre antes e inmediatamente después de cada una de las 3 series, así como 15 minutos después de la última serie. Además, se evaluó la calificación del esfuerzo percibido (RPE) utilizando la escala OMNI-RES inmediatamente después de la finalización de cada sesión. Resultados: Se encontraron aumentos significativos en el protocolo IF al final de cada una de las 3 series, con tamaños de efecto significativos (1ª serie, P= .000, d= 2,66; 2ª serie, P= .000; d= 3,14; 3ª serie, P= .000, d= 3,50), al igual que en el protocolo FE (1ª serie, P= .001, d= 2,24; 2ª serie, P= .000, d= 3,35; 3ª serie, P= .000; d= 3,67). Sin embargo, no hubo diferencias intergrupales significativas entre el pre y cualquier set (1ª set, P=0,951, d=0,03; 2ª set, P=0,239, d=0,47; 3ª set, P=0,435, d=0,31, respectivamente). Además, las percepciones en la escala RPE fueron mayores en la IF (P= 0,032; d = 0,47). Conclusiones: Los hallazgos sugieren que la aplicación de la IF puede contribuir indirectamente a la hipertrofia muscular en ejercicios multiarticulares de miembros inferiores, debido al aumento de los valores de RPE y a la correlación existente con la producción de lactato.
Palabras clave: Mente-músculo, hipertrofia muscular, foco interno, conexión mente-músculo, entrenamiento de resistencia

Abstract.  The aim of this study was to investigate the effect of internal focus (IF) and external focus (EF) on lactate production and the perception of perceived exertion in the squat in strength trained-men. Methods: Thirteen men with experience in strength training (age =22.61 ± 1.19 years; height = 180 ± 6.55 cm; body mass = 79.38 ± 5.57 kg; BMI = 24.56 ± 2.11 kg·m-2; Squat = 129 ± 20 kg) performed two sessions, separated by one week, comprising 3 sets of 10 repetitions of the back squat with one minute of rest between sets. During the IF protocol participants were instructed to focus on tightening the quads during all repetitions, while participants in the EF were instructed to focus on lifting the barbell. Blood lactate samples were collected before and at immediately after each of the 3 sets, as well as 15 minutes after the last set. Additionally, the rating of perceived exertion (RPE) was evaluated using the OMNI-RES scale immediately after the completion of each session. Results: Significant increases were found in the IF protocol at the end of each of the 3 sets, with significant effect sizes (1ª set, P= .000, d= 2.66; 2ª set, P= .000; d= 3.14; 3ª set, P= .000, d= 3.50), as in the EF protocol (1ª set, P= .001, d= 2.24; 2ª set, P= .000, d= 3.35; 3ª set, P= .000; d= 3.67). However, there were no significant inter-group differences between pre and any set (1ª set, P=0.951, d=0.03; 2ª set, P=0.239, d=0.47; 3ª set, P=0.435, d=0.31, respectively). Additionally, the perceptions on the RPE scale were higher in the FI (P= 0.032; d = 0.47). Conclusions: Findings suggest that the application of IF may indirectly contribute to muscle hypertrophy in multi-joint lower limb exercises, due to the increase in RPE values and the existing correlation with lactate production.

Keywords: Mind-muscle, muscle hypertrophy, internal focus, mind-muscle connection, resistance training


Aniceto, R. R., Ritti-Dias, R. M., Dos Prazeres, T. M., Farah, B. Q., de Lima, F. F., & do Prado, W. L. (2015). Rating of Perceived Exertion During Circuit Weight Training: A Concurrent Validation Study. J Strength Cond Res, 29(12), 3336-3342. doi:10.1519/JSC.0000000000000998
Bourdon, P. C., Cardinale, M., Murray, A., Gastin, P., Kellmann, M., Varley, M. C., . . . Cable, N. T. (2017). Monitoring Athlete Training Loads: Consensus Statement. Int J Sports Physiol Perform, 12(Suppl 2), S2161-S2170. doi:10.1123/IJSPP.2017-0208
Calatayud, J., Vinstrup, J., Jakobsen, M. D., Sundstrup, E., Brandt, M., Jay, K., . . . Andersen, L. L. (2016). Importance of mind-muscle connection during progressive resistance training. Eur J Appl Physiol, 116(3), 527-533. doi:10.1007/s00421-015-3305-7
Candotti, C. T., Loss, J. F., Melo Mde, O., La Torre, M., Pasini, M., Dutra, L. A., . . . de Oliveira, L. P. (2008). Comparing the lactate and EMG thresholds of recreational cyclists during incremental pedaling exercise. Can J Physiol Pharmacol, 86(5), 272-278. doi:10.1139/y08-020
Caulfield, S., & Berninger, D. (2016). Exercise technique for free weight and machine training. In: Haff GG, Triplett NT (I. H. K. Essentials of Strength training and conditioning. Champaign Ed.).
Dankel, S. J., Mattocks, K. T., Jessee, M. B., Buckner, S. L., Mouser, J. G., & Loenneke, J. P. (2017). Do metabolites that are produced during resistance exercise enhance muscle hypertrophy? Eur J Appl Physiol, 117(11), 2125-2135. doi:10.1007/s00421-017-3690-1
Day, M. L., McGuigan, M. R., Brice, G., & Foster, C. (2004). Monitoring exercise intensity during resistance training using the session RPE scale. J Strength Cond Res, 18(2), 353-358. doi:10.1519/R-13113.1
Duncan, M. J., Al-Nakeeb, Y., & Scurr, J. (2006). Perceived exertion is related to muscle activity during leg extension exercise. Res Sports Med, 14(3), 179-189. doi:10.1080/15438620600854728
Forsyth, J. J., & Farrally, M. R. (2000). A comparison of lactate concentration in plasma collected from the toe, ear, and fingertip after a simulated rowing exercise. Br J Sports Med, 34(1), 35-38. doi:10.1136/bjsm.34.1.35
Gladden, L. B. (2004). Lactate metabolism: a new paradigm for the third millennium. J Physiol, 558(Pt 1), 5-30. doi:10.1113/jphysiol.2003.058701
Gonzalez-Badillo, J. J., & Sanchez-Medina, L. (2010). Movement velocity as a measure of loading intensity in resistance training. Int J Sports Med, 31(5), 347-352. doi:10.1055/s-0030-1248333
Halperin, I., Chapman, D. W., Martin, D. T., & Abbiss, C. (2017). The effects of attentional focus instructions on punching velocity and impact forces among trained combat athletes. J Sports Sci, 35(5), 500-507. doi:10.1080/02640414.2016.1175651
Halperin, I., Williams, K. J., Martin, D. T., & Chapman, D. W. (2016). The Effects of Attentional Focusing Instructions on Force Production During the Isometric Midthigh Pull. J Strength Cond Res, 30(4), 919-923. doi:10.1519/JSC.0000000000001194
Kraemer, W. J., Noble, B. J., Clark, M. J., & Culver, B. W. (1987). Physiologic responses to heavy-resistance exercise with very short rest periods. Int J Sports Med, 8(4), 247-252. doi:10.1055/s-2008-1025663
Lagally, K. M., & Robertson, R. J. (2006). Construct validity of the OMNI resistance exercise scale. J Strength Cond Res, 20(2), 252-256. doi:10.1519/R-17224.1
Lagally, K. M., Robertson, R. J., Gallagher, K. I., Gearhart, R., & Goss, F. L. (2002). Ratings of perceived exertion during low- and high-intensity resistance exercise by young adults. Percept Mot Skills, 94(3 Pt 1), 723-731. doi:10.2466/pms.2002.94.3.723
Lagally, K. M., Robertson, R. J., Gallagher, K. I., Goss, F. L., Jakicic, J. M., Lephart, S. M., . . . Goodpaster, B. (2002). Perceived exertion, electromyography, and blood lactate during acute bouts of resistance exercise. Med Sci Sports Exerc, 34(3), 552-559; discussion 560. doi:10.1097/00005768-200203000-00025
McGuigan, M. (2016). Administration, scoring, and interpretation of selected tests. In: Haff GG, Triplett NT, editors.
Morton, R. W., Colenso-Semple, L., & Phillips, S. M. (2019). Training for strength and hypertrophy: an evidence-based approach. Current Opinion in Physiology, 10, 90-95. doi:https://doi.org/10.1016/j.cophys.2019.04.006
Ozaki, H., Loenneke, J. P., Buckner, S. L., & Abe, T. (2016). Muscle growth across a variety of exercise modalities and intensities: Contributions of mechanical and metabolic stimuli. Med Hypotheses, 88, 22-26. doi:10.1016/j.mehy.2015.12.026
Robertson, R. J., Goss, F. L., Rutkowski, J., Lenz, B., Dixon, C., Timmer, J., . . . Andreacci, J. (2003). Concurrent validation of the OMNI perceived exertion scale for resistance exercise. Med Sci Sports Exerc, 35(2), 333-341. doi:10.1249/01.MSS.0000048831.15016.2A
Scherr, J., Wolfarth, B., Christle, J. W., Pressler, A., Wagenpfeil, S., & Halle, M. (2013). Associations between Borg's rating of perceived exertion and physiological measures of exercise intensity. Eur J Appl Physiol, 113(1), 147-155. doi:10.1007/s00421-012-2421-x
Schoenfeld, B. J. (2010a). The mechanisms of muscle hypertrophy and their application to resistance training. J Strength Cond Res, 24(10), 2857-2872. doi:10.1519/JSC.0b013e3181e840f3
Schoenfeld, B. J. (2010b). Squatting kinematics and kinetics and their application to exercise performance. J Strength Cond Res, 24(12), 3497-3506. doi:10.1519/JSC.0b013e3181bac2d7
Schoenfeld, B. J. (2013). Potential mechanisms for a role of metabolic stress in hypertrophic adaptations to resistance training. Sports Med, 43(3), 179-194. doi:10.1007/s40279-013-0017-1
Schoenfeld, B. J., Vigotsky, A., Contreras, B., Golden, S., Alto, A., Larson, R., . . . Paoli, A. (2018). Differential effects of attentional focus strategies during long-term resistance training. Eur J Sport Sci, 18(5), 705-712. doi:10.1080/17461391.2018.1447020
Snarr, B. D., Howell, P. L., & Sheppard, D. C. (2018). Hoisted by their own petard: do microbial enzymes hold the solution to treating and preventing biofilm infections? Future Microbiol, 13, 395-398. doi:10.2217/fmb-2017-0243
Snyder, B. J., & Fry, W. R. (2012). Effect of verbal instruction on muscle activity during the bench press exercise. J Strength Cond Res, 26(9), 2394-2400. doi:10.1519/JSC.0b013e31823f8d11
Snyder, B. J., & Leech, J. R. (2009). Voluntary increase in latissimus dorsi muscle activity during the lat pull-down following expert instruction. J Strength Cond Res, 23(8), 2204-2209. doi:10.1519/JSC.0b013e3181bb7213
Vargas, S., Petro, J. L., Romance, R., Bonilla, D. A., Florido, M. A., Kreider, R. B., . . . Benitez-Porres, J. (2019). Comparison of changes in lean body mass with a strength- versus muscle endurance-based resistance training program. Eur J Appl Physiol, 119(4), 933-940. doi:10.1007/s00421-019-04082-0
Vargas-Molina, S., Martin-Rivera, F., Bonilla, D. A., Petro, J. L., Carbone, L., Romance, R., . . . Benitez-Porres, J. (2020). Comparison of blood lactate and perceived exertion responses in two matched time-under-tension protocols. PLoS One, 15(1), e0227640. doi:10.1371/journal.pone.0227640
Vargas-Molina, S., Petro, J. L., Romance, R., Kreider, R. B., Schoenfeld, B. J., Bonilla, D. A., & Benitez-Porres, J. (2020). Effects of a ketogenic diet on body composition and strength in trained women. J Int Soc Sports Nutr, 17(1), 19. doi:10.1186/s12970-020-00348-7
WMA. (2013). World medical association declaration of helsinki ethical principles for medical research involving human subjects. JAMA, 310(20):, 2191-2194. doi:https://doi.org/10.1001/jama.2013.281053
Wulf, G. (2013). Attentional focus and motor learning: A review of 15 years. International Review of Sport and Exercise Psychology,, 6 (1), 77-104.
Wulf, G., Hoss, M., & Prinz, W. (1998). Instructions for motor learning: differential effects of internal versus external focus of attention. J Mot Behav, 30(2), 169-179. doi:10.1080/00222899809601334




Cómo citar

Vargas-Molina, S., García Sillero, M., Salgado, U., Carbone, L., & Martín-Rivera, F. (2023). Efecto del foco atencional en la sentadilla sobre la producción de lactato y la percepción del esfuerzo percibido en hombres (Effect of attentional focus on squats on lactate production and rating of perceived exertion in trained men). Retos, 47, 452–457. https://doi.org/10.47197/retos.v47.94631



Artículos de carácter científico: trabajos de investigaciones básicas y/o aplicadas