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The effect of aging on carotid artery wall mechanics during maximal resistance exercise

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Abstract

Introduction

Age-related stiffening of the large elastic arteries (e.g., common carotid artery [CCA]) may impair wall dynamics (i.e., strain) and amplify transmission of pulsatile blood flow into the brain with large increases in pressure that occur during maximal resistance exercise (RE). The purpose of this study was to compare CCA arterial wall dynamics, central hemodynamics, and cerebral blood velocity responses during maximal RE between young and older adults.

Methods

Thirty-one young (YA; 26 ± 5 yrs; 23.8 ± 3.3 kg/m2) and 25 older adults (OA; 60 ± 6 yrs; 30.0 ± 5.5 kg/m2) performed a unilateral maximal isokinetic knee flexion/extension exercise protocol (i.e., maximal RE). All measures were recorded at baseline and during the last 10 s of maximal RE. Common carotid artery strain, CCA strain time to peak, and CCA strain rate (i.e., variables of arterial wall dynamics) were analyzed using 2D speckle tracking software from circumferential ultrasound images. Transcranial Doppler was used to measure right middle cerebral artery (MCA) blood velocity. Non-invasive arterial blood pressure measurements were obtained using finger photoplethysmography.

Results

Older adults had greater reductions in CCA strain time to peak from baseline to maximal RE (345 ± 39 to 242 ± 52 ms) than YA (308 ± 35 to 247 ± 42 ms; interaction effect, p < 0.01). MCA velocity was similar between YA and OA during maximal RE (p = 0.48), despite a greater arterial pressor response in OA (p < 0.01).

Conclusion

These data suggest cerebral blood velocity responds similarly during maximal RE among OA compared to YA, despite subtle age-related differences in the pressor and extracranial vascular response during maximal RE.

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Abbreviations

CCA:

Common carotid artery

ANOVA:

Analysis of variance

BP:

Blood pressure

CAVI:

Cardio/ankle vascular index

cIMT:

Carotid intima-media thickness

CO2 :

Carbon-dioxide

CVD:

Cardiovascular disease

DBP:

Diastolic blood pressure

HR:

Heart rate

MAP:

Mean arterial pressure

MCA:

Middle cerebral artery

OA:

Older adults

Pi:

Pulsatility index

PP:

Pulse pressure

Q:

Cardiac output

RE:

Resistance exercise

SBP:

Systolic blood pressure

SD:

Standard deviation

SV:

Stroke volume

SVR:

Systemic vascular resistance

YA:

Young adults

References

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Funding

Foundation for the National Institutes of Health, 5F32HL144082-04, Alexander Rosenberg.

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Authors

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Correspondence to Alexander J. Rosenberg.

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None to declare for any authors.

Additional information

Communicated by I. Mark Olfert.

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Sherman, S.R., Lefferts, W.K., Lefferts, E.C. et al. The effect of aging on carotid artery wall mechanics during maximal resistance exercise. Eur J Appl Physiol 122, 2477–2488 (2022). https://doi.org/10.1007/s00421-022-05016-z

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  • DOI: https://doi.org/10.1007/s00421-022-05016-z

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