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Cardiac autonomic response to aerobic exercise with different levels of blood flow restriction in pre-hypertensive men

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Abstract

Purpose

Cardiovascular safety of aerobic exercise with blood flow restriction (BFR) has been little studied in clinical populations. This study investigated the effects of different levels of BFR on cardiac autonomic response during and after walking tasks in pre-hypertensive men.

Methods

Twelve pre-hypertensive men performed three randomly assigned experimental sessions: (1) 20 min of walking at 40% of peak running velocity (Vpeak) without BFR (CON); (2) 20 min of walking at 40% of Vpeak with BFR sets at 40% of the maximum cuff pressure that fully interrupted blood flow (BFR40); and (3) 20 min of walking at 40% of Vpeak with BFR sets at 80% of the maximum cuff pressure that fully interrupted blood flow (BFR80). The HR and HRV measurements were taken at rest, during exercise, and during the recovery period after constant load sessions.

Results

Heart rate was higher throughout the BFR80 session when compared to the CON condition (p < 0.05). The time constant of heart rate recovery was higher in both BFR80 (73.2 ± 28.8 s) and BFR40 (49.8 ± 16.1 s) compared to CON (24.3 ± 7.8 s; p < 0.01). In addition, the cardiac vagal modulation during recovery was lower in the BFR80 than CON (p < 0.05), but there was no significant difference between BFR40 and CON or between BFR80 and BFR40 (p > 0.05).

Conclusions

Restricting blood flow imposes additional cardiovascular stress during and after exercise in pre-hypertensive men, with apparently greater stress as the level of BFR increases.

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Abbreviations

τ :

Time constant of heart rate decay

BFR:

Blood flow restriction

BFR40:

Walking at 40% of peak running velocity with 40% blood flow restriction

BFR80:

Walking at 40% of peak running velocity with 80% blood flow restriction

CON:

Walking at 40% of peak running velocity

HF:

High-frequency power

HR:

Heart rate

HRV:

Heart rate variability

LF:

Low-frequency power

RMSSD:

Root mean square of successive differences between adjacent normal R–R intervals

RMSSD60s :

Root mean square of successive differences between adjacent normal R–R intervals on subsequent 60 s non-overlapped segments

RRi:

R–R intervals

SDNN:

Standard deviation of consecutive R–R intervals

Vpeak :

Peak running velocity

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Correspondence to Julio Cezar Schamne.

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The study was approved by the Local Ethics Committee and performed in accordance with the recommendations from the Declaration of Helsinki.

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Schamne, J.C., Motin, C., Sochodolak, R.C. et al. Cardiac autonomic response to aerobic exercise with different levels of blood flow restriction in pre-hypertensive men. Sport Sci Health 17, 375–382 (2021). https://doi.org/10.1007/s11332-020-00699-3

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