Journal of Applied Physiology AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol (April 6, 2006). doi:10.1152/japplphysiol.01567.2005
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Submitted on December 13, 2005
Accepted on March 16, 2006

Active hyperemia and vascular conductance differ between men and women for an isometric fatiguing contraction

Sandra K Hunter1*, Jennie M Schletty1, Kristine M Schlachter1, Erin E Griffith1, Aaron J Polichnowski1, and Alexander V. Ng1

1 Exercise Science Program, Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, United States

* To whom correspondence should be addressed. E-mail: sandra.hunter{at}marquette.edu.

To understand the role of muscle perfusion in the sex differences of muscle fatigue, we compared the time to task failure, post-contraction (active) hyperemia and vascular conductance for an isometric fatiguing contraction performed by young men and women with the handgrip muscles at 20% of maximal voluntary contraction (MVC) force. In study one, the men (n = 16) were stronger than the women (n = 18) and study two the men (n = 7) and women (n = 7) were matched for strength. Isometric contractions were sustained during two sessions: (1) until the target force could no longer be achieved, or (2) for 4 minutes. For both studies, blood flow and vascular conductance were similar for the men and women at rest and after 10 mins occlusion, and at task failure for the fatiguing contraction estimated using forearm venous occlusion plethysmography. In study one, the time to task failure was longer for the women (11.4 ± 2.8 min) than the men (8.4 ± 2.4 min, P = 0.003). However, at the end of the 4-min contraction, active hyperemia and vascular conductance was greater for the men than the women (99 % vs. 70 % peak blood flow, P < 0.001). In study two, the men and women had similar strength and a similar time to failure (8.4 ± 1.6 min vs 8.6 ± 2.3 min). Active hyperemia was greater for the men than the women (86 vs. 64 % peak flow, P = 0.038) after the 4-min contraction, as was vascular conductance (80 vs. 57 % peak conductance, P = 0.02). Thus, the briefer time to failure of men than women for an isometric fatiguing contraction are a function of the greater strength of men but not dependent on differences in the active hyperemia and vascular conductance.




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