n International SportMed Journal - Alteration in EMG during a graded treadmill exercise test after 3 days recovery from angioplasty in a patient with peripheral vascular disease : case report
|Article Title||Alteration in EMG during a graded treadmill exercise test after 3 days recovery from angioplasty in a patient with peripheral vascular disease : case report|
|© Publisher:||International Federation of Sports Medicine|
|Journal||International SportMed Journal|
|Affiliations||1 University of Cape Town, 2 University of Cape Town and 3 University of Cape Town|
|Publication Date||Jan 2011|
|Pages||92 - 103|
|Keyword(s)||Angioplasty, Muscle activity and Peripheral vascular disease|
Peripheral vascular disease limits exercise performance due to claudication pain, which is believed to originate from ischemia and increased blood lactate concentrations. However, no research has investigated the relationship between muscle activity, claudication pain and functional capacity. We report on a patient with a single tight stenosis of the femoral artery treated by performing percutaneous transluminal angioplasty. We measured muscle activity, exercise performance and other physiological variables before and 3 days after angioplasty. The patient performed maximal voluntary contractions prior to walking on the treadmill until exhaustion using the graded treadmill exercise test (GTET) protocol. Electromyography, heart rate, brachial blood pressure, rating of perceived exertion, pain score, oxygen consumption and blood lactate concentrations were measured during both trials. Muscle activity in the diseased leg was found to increase after angioplasty, with an increase in functional capacity and decrease in claudication pain. His physiological variables and force outputs improved after angioplasty; however, the blood lactate concentrations were low ranging between 2.00-1.75mmol.l-1 before angioplasty and 1.75-1.50mmol.l-1 after angioplasty. This case report demonstrates the change in muscle activity once blood flow is restored to the affected limb. We encourage clinicians and researchers to be attentive to the probable alteration in muscle activity and the role it plays in these patients' functional capacity and claudication pain. The findings of this study present possible usage for EMG in this patient population, 1) used as a additional screenings tool to objectively measure when the occlusion affects neuromuscular function and if so then angioplasty intervention could be justified; 2) as a monitoring tool of neuromuscular function during and after rehabilitation 3) possibly be used as a screening tool for re-occlusions.
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