Table 1 Studies investigating CBF responses to dynamic resistance exercise
From: The Acute Cardiorespiratory and Cerebrovascular Response to Resistance Exercise
| Â | Intensity | Exercise performed | Cohort | Contraction number and duty cycle | CBF metrics | VM | CBF response | MAP response |
|---|---|---|---|---|---|---|---|---|
Dickerman et al. [62] | 100% of 1RM | Bilateral leg press | Mean age: 31 n: 9 Healthy resistance trained males | Duty cycle: Not stated Number: 1 | Unilateral MCAv – averaged across exercise | Yes | Mean decrease in MCAvmean of 16 cm.s-1. Unclear if pre exercise hyperventilation contributed as neither PETCO2 or PaCO2 were reported | Not reported |
Edwards et al. [12] | Self-selected 10RM, equates to ~75% of MVC | Bilateral leg press | Mean age: 21 n: 9 Healthy resistance trained participants (6 females) | Duty cycle: not stated Number: 10 | Unilateral MCAv – averaged across exercise | No | No change during exercise but acute reduction in MCAvmean (mean 7 cm.s-1) below rest within 5s of exercise cessation | Mean increase of ~15 mm HG in MAP during exercise with no post exercise hypotension reported. |
Koch et al. [63] | Endurance: 50–60% of maximum Strength: 80–90% of maximum | Bilateral leg extension | Mean age: males = 25, females = 24 n: 39 Healthy resistance trained participants (17 females) | Duty cycle: ~2s contraction time Number: Until exhaustion. Endurance maximum of 23 repetitions and strength maximum of 8 repetitions. | Bilateral MCAv | No – but brief VM could not be excluded. | 15–30% increases in MCAvmean in both intensities examined. Temporarily impaired autoregulation following exercise with evidence of presyncopal reactions. | Increase at both intensities and rapid decline following exercise. |
Moralez et al. [64] | Estimated 10RM | Bilateral leg press exercise | Mean age: 24 n: 10 Healthy males | Duty cycle: 10 repetitions per 30s (0.33hz) Number: 10 Repetitions | Unilateral MCAv – averaged across exercise | No | Increase in MCAvmean. Acute reduction when standing immediately following exercise | Increase in MAP. Acute reduction upon standing immediately following exercise |
Perry et al. [55] | 30, 60 and 90% of 6RM | Upright squatting | Mean age: 26 n: 12 Healthy resistance trained males | Duty cycle: 2s eccentric and 2s concentric Number: 2 and 6 repetitions | Unilateral MCAv. Peak MCAv (at onset of concentric phase) analysed per repetition and absolute decrease following exercise | Yes, only observed at 90% 6RM | Similar mean increases of 31% in peak MCAvmean across all intensities. Larger decrease in MCAvmean post exercise at 90% 6RM. | Intensity dependent increase in MAP during exercise and reduction immediately following exercise. |
Romero and Cooke [65] | 80% of 6RM | Bilateral leg press | Mean age: 26 n: 10 Healthy resistance trained participants (5 females) | Duty cycle: Not stated Number: 10 Repetitions | Unilateral MCAv – averaged across exercise | No | 12% increase in MCAvmean without pre-exercise hyperventilation. Acute reduction when standing immediately following exercise. Pre exercise hyperventilation reduced MCAv during exercise. | Increase in MAP. Acute reduction upon standing immediately following exercise |