Abstract
Purpose
Traditional resistance exercise decreases vagal tone up to 30 min after an acute bout of resistance exercise, which may increase the risk of cardiovascular events. However, the effects of resistance exercise with blood flow restriction (BFR) on autonomic modulation are unclear. To evaluate autonomic modulation after resistance exercise with and without BFR in resistance-trained men.
Methods
Eleven young men volunteered for the study. Autonomic modulation was assessed at rest, 15 (Rec 1), and 25 (Rec 2) minutes after low-load bench press with BFR (LL-BFR), traditional high-load bench press (HL), and a control (CON). Autonomic modulation assessments were expressed as natural logarithm (Ln), and included total power (LnTP), low-frequency power (LnLF), high-frequency power (LnHF), sympathovagal balance (LnLF/LnHF ratio), root mean square of the successive differences (LnRMSSD), and the proportion of intervals differing by > 50 ms from the preceding intervals (LnPNN50). A repeated measures ANOVA was used to evaluate conditions (LL-BFR, HL and CON) across time (Rest, Rec1, and Rec2) on autonomic modulation.
Results
There were significant condition by time interactions for LnTP, LnHF, and LnRMSSD such that they were reduced during recovery after LL-BFR and HL compared to Rest and CON. There were no interactions in the LnLF, LnLF/LnHF ratio, and LnPNN50.
Conclusions
These data suggest that LL-BFR and HL significantly alter autonomic modulation up to 30 min after exercise with significant reduction after HL compared to LL-BFR when exercise volume is equated.
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Abbreviations
- 1RM:
-
1-Repetition maximum
- ACSM:
-
American College of Sports Medicine
- BFR:
-
Blood flow restriction
- BMI:
-
Body mass index
- BP:
-
Blood pressure
- CON:
-
Control
- ECG:
-
Electrocardiogram
- HF:
-
High-frequency power
- HL:
-
Traditional high-load bench press
- HR:
-
Heart rate
- HRV:
-
Heart rate variability
- LL-BFR:
-
Low-load bench press with blood flow restriction
- Ln:
-
Natural logarithm
- LnHF:
-
Natural logarithm of high-frequency power
- LnLF:
-
Natural logarithm of low-frequency power
- LnPNN50:
-
Natural logarithm of number of normal to normal intervals which differed by > 50 ms from adjacent intervals divided by the total number of all normal to normal intervals
- LnRMSSD:
-
Natural logarithm of root mean square of successive differences of normal to normal intervals
- LnTP:
-
Natural logarithm of total power
- LF:
-
Low-frequency power
- NN:
-
Normal to normal intervals
- PAR-Q:
-
Physical Activity Readiness Questionnaire
- TP:
-
Total power
- PNN50:
-
Number of normal to normal intervals which differed by > 50 ms from adjacent intervals divided by the total number of all normal to normal intervals
- RMSSD:
-
Root mean square of successive differences of normal to normal intervals
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Acknowledgements
This study was funded by a grant from the School of Health Sciences at Kent State University.
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YLT and JDK conceived and designed. YLT, EMM, AG, JCP, and LS conducted experiments. YLT and JDK analyzed data. YLT and JDK wrote the manuscript. All authors read and approved the manuscript.
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Communicated by William J. Kraemer.
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Tai, Y.L., Marshall, E.M., Glasgow, A. et al. Autonomic modulation following an acute bout of bench press with and without blood flow restriction. Eur J Appl Physiol 119, 2177–2183 (2019). https://doi.org/10.1007/s00421-019-04201-x
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DOI: https://doi.org/10.1007/s00421-019-04201-x