Abstract
Purpose
To examine the interactive effects of VM and isometric resistance exercise on cerebral haemodynamics.
Methods
Eleven healthy participants (mean ± SD 28 ± 9 years; 2 females) completed 20-s bilateral isometric leg extension at 50% of maximal voluntary contraction with continued ventilation (RE), a 20-s VM at mouth pressure of 40 mmHg (VM), and a combination (RE + VM), in randomised order. Mean beat-to-beat blood velocity in the posterior (PCAvmean) and middle cerebral arteries (MCAvmean), vertebral artery blood flow, end-tidal partial pressure of CO2 and mean arterial pressure (MAP) were measured. RE data were time aligned to RE + VM and analysed according to standard VM phases.
Results
Interaction effects (VM phase × condition) were observed for MCAvmean, PCAvmean, vertebral artery blood flow and MAP (all ≤ 0.010). Phase I MCAvmean was greatest for RE [88 ± 19, vs. 71 ± 11 and 78 ± 12 cm s−1 for VM (P = 0.008) and RE + VM (P = 0.021), respectively]. Greater increases in MCAvmean than PCAvmean occurred in phase I of RE only (24 ± 15% vs. 16 ± 16%, post hoc P = 0.044). In phase IIb, MAP was lower in RE than RE + VM (115 ± 15 vs. 138 ± 21 mmHg, P = 0.004), but did not reduce MCAvmean (78 ± 8 vs. 79 ± 9 cm s−1, P = 0.579) or PCAvmean (45 ± 11 vs .46 ± 11 cm s−1, P = 0.617). Phase IIb MCAvmean and PCAvmean was lowest in VM (66 ± 6 and 39 ± 8 cm s−1, respectively, all P < 0.001), whereas in Phase IV, MCAvmean, PCAvmean and MAP were greater in VM than in RE and RE + VM (all P < 0.020).
Conclusion
RE and RE + VM produce similar cerebrovascular responses despite different MAP profiles. However, the VM produced the greatest cerebrovascular challenge afterward.
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Abbreviations
- ABP:
-
Arterial blood pressure
- DMCAv:
-
Diastolic middle cerebral artery blood velocity
- DPCAv:
-
Diastolic posterior cerebral artery blood velocity
- CCP:
-
Critical closing pressure
- CPP:
-
Cerebral perfusion pressure
- CVCi:
-
Cerebrovascular conductance index
- DBP:
-
Diastolic blood pressure
- HR:
-
Heart rate
- ICA:
-
Internal carotid artery
- ICP:
-
Intracranial pressure
- MAP:
-
Mean arterial pressure
- MCA:
-
Middle cerebral artery
- MCAv:
-
Middle cerebral artery blood velocity
- MCAvmean :
-
Mean middle cerebral artery blood velocity
- MVC:
-
Maximal voluntary contraction
- PCA:
-
Posterior cerebral artery
- PCAv:
-
Posterior cerebral artery blood velocity
- PCAvmean :
-
Mean posterior cerebral artery blood velocity
- PETCO2 :
-
Partial pressure of end tidal carbon dioxide
- Pi:
-
Pulsatility index
- PI:
-
Phase 1
- PII:
-
Phase 2
- PIIa:
-
Phase 2a
- PIII:
-
Phase 3
- PIV:
-
Phase IV
- RE:
-
Resistance exercise
- RE + VM:
-
Resistance exercise with concurrent Valsalva manoeuvre
- SMCAv:
-
Systolic middle cerebral artery blood velocity
- SPCAv:
-
Systolic posterior cerebral artery blood velocity
- VA:
-
Vertebral artery
- VM:
-
Valsalva manoeuvre
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Funding
This study was funded by the Massey University School of Health Sciences.
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Experiment was performed at the School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand. BGP, TD, KNT, LW, and JC were involved in conception and design of research. All authors were involved in conducting the research. BGP, KNT, LW, TDG, and JC were involved in data analysis and interpretation. All authors edited and revised manuscript with all authors approving the final version.
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Communicated by Keith Phillip George.
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Perry, B.G., De Hamel, T., Thomas, K.N. et al. Cerebrovascular haemodynamics during isometric resistance exercise with and without the Valsalva manoeuvre. Eur J Appl Physiol 120, 467–479 (2020). https://doi.org/10.1007/s00421-019-04291-7
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DOI: https://doi.org/10.1007/s00421-019-04291-7