Modification of vascular function after handgrip exercise training in 73- to90-yr-old men

Devon A. Dobrosielski, Frank L. Greenway, David A. Welsh, S. Michal Jazwinski, Michael A. Welsch

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

PURPOSE: To examine the influence of a unilateral exercise training protocol on brachial artery reactivity (BAR) in 12 men (aged 81 ± 5 yr). METHODS:: Brachial artery diameters and blood flow parameters were assessed, in both arms, using high-resolution ultrasonography, before and after 5 min of forearm occlusion, before and at the end of each week of a 4-wk training program. Training consisted of a unilateral handgrip training protocol (nondominant arm) at 60% of maximal voluntary handgrip strength, performed for 4 wk, 4 d•wk, 20 min per session, and a cadence of one contraction per 4 s. RESULTS:: After training, handgrip strength increased 6.2% (baseline = 32.4 ± 7.0 kg vs week 4 = 34.4 ± 6.7 kg) in the trained arm only but failed to reach statistical significance (P = 0.10). No statistical changes were observed for blood pressure or resting HR. In contrast, BAR increased 45% (Pre = 2.9% vs Post = 4.1%, P = 0.05) in the trained arm only. Improvements in BAR were observed after the second week of training, without significant changes in the main vasodilatory trigger, defined as the relevant shear stimulus after forearm occlusion (P > 0.05). CONCLUSIONS:: These data indicate that a localized short-term exercise program results in significant improvements in vascular function in the trained arm of elderly men compared with the control arm. Furthermore, the findings indicate a statistically significant increase in BAR at the end of the second week of training, despite a similar trigger for dilation versus before training.

Original languageEnglish (US)
Pages (from-to)1429-1435
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume41
Issue number7
DOIs
StatePublished - Jul 2009
Externally publishedYes

ASJC Scopus subject areas

  • General Medicine

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