Journal of Applied Physiology AJP: Endocrinology and Metabolism
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J Appl Physiol (October 11, 2002). doi:10.1152/japplphysiol.00736.2002
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Articles in PresS, published online ahead of print October 11, 2002
J Appl Physiol, 10.1152/jap.00736.2002
Submitted on August 9, 2002
Accepted on September 26, 2002

Blood Flow and Muscle Fatigue in SCI Individuals during Electrical Stimulation

Jennifer L Olive1, Jill M Slade1, Gary A Dudley1, and Kevin K McCully1*

1 Department of Exercise Science, University of Georgia, Athens, GA, USA

* To whom correspondence should be addressed. E-mail: kmccully{at}coe.uga.edu.

Our purpose was to measure blood flow and muscle fatigue in chronic, complete, spinal cord injured (SCI) and able-bodied (AB) individuals during electrical stimulation. Electrical stimulation of the quadriceps muscles was used to elicit similar activated muscle mass. Blood flow was measured in the femoral artery by Doppler ultrasound. Muscle fatigue was significantly greater (3-8 fold, p<=T 0.001) in the SCI versus the AB individuals. The magnitude of blood flow was not significantly different between groups. A prolonged half time to peak blood flow at the beginning of exercise (5 fold, p = 0.001) and recovery of blood flow at the end of exercise (3 fold, p = 0.009) was found in the SCI versus the AB group. In conclusion, the magnitude of the muscle blood flow to electrical stimulation was not associated with increased muscle fatigue in SCI individuals. However, the prolonged time to peak blood flow may be an explanation for increased fatigue in SCI individuals.




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