Abstract details

Abstract-ID: 254
Authors: Ra-Alonso, M.1, Iglesias-Soler, E.1, Mayo, X.2, Rial-Vzquez, J.1, Farinas, J.1
Institution: 1: University of A Coruna , 2: King Juan Carlos University
Department: Department of Physical and Sports Education.
Country: Spain
Abstract text INTRODUCTION:
After a resistance training (RT) session, cardiac vagal modulation decreases what entails an increase of cardiovascular risk (1). Several factors affect to this decrease in the cardiac vagal control, such as the level of the anaerobic metabolism contribution (2). Set configuration refers to the repetitions performed with respect to the maximum possible number in a set and can modulate metabolic implication of RT session. The aim of this study was to analyse the acute effects on heart rate variability (HRV) of two RT sessions differing in set configuration.
38 sport science students performed in a random order two RT sessions (leg extension, leg curl, lat pull, bench press and parallel squat) and a control session (CON). In both experimental sessions a total of 40 repetitions with the 15RM load were performed with 360 sec of total resting time with two set configurations: 4 sets of 10 repetitions with 2 min-rest between sets (Traditional Sets: TS) and 8 sets of 5 repetitions with 51 sec-rest between sets (Cluster Sets: CS).
Before and after the sessions, blood lactate concentration (BL) was obtained and beat-to-beat intervals recorded in order to analyse HRV.
HRV was analysed by non-parametric ANOVA type statistics in order to evaluate the effect and interaction between the factors session (CS, TS, CON) and time (Pre, 20-25, 25-30, 30-35 and 35-40). Post hoc comparisons were performed using Wilcoxson test with Bonferroni correction. A t paired test was used to compare increments of BL.
For time domain indices of HRV, main effects for time were observed (SDNN: p<0.001; RMSSD: p=0,009). Main effects for session were found for SDNN (p<0.001) and a tendency for RMSSD (p=0.052). Also, significant interactions were revealed (p=0.004 and p=0,01 for SDNN and RMSSD respectively). After TS and CS, lower SDNN and RMSSD values were observed compared with CON at the different time points and with respect to pretest values. Decreases of SDNN and RMSSD were higher after TS in comparison with CS.
For frequency domain measures, main effects of session, time and interaction were found for HF(nu) (p<0.001). After both sessions, lower values were observed in comparison with CON at the different time points. During the post-exercise period in experimental sessions, HF(nu) values were lower than pretest. Major decrease in TS than CS were revealed.
BL increments were significant higher in TS in comparison with CS (p<0.001).
These data shown that both sessions reduce cardiac vagal modulation what is coincident with previous studies (3). The cluster set configuration mitigated the loss of cardiac vagal modulation and reduced BL increments compared to a traditional set configuration.

1) A.J. Camm Circulation 93(5),1043-1065(1996)
2) M. Buchheit et al., Am J Physiol Heart Circ Physiol 1,13341 (2007)
3) J.C. De Souza et al., BMC Cardiovasc Disord 13(1),105 (2013)
Topic: Training and Testing
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