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- W2326599839 abstract "Patients with chronic cardiovascular disease are shown to have secondary changes in the skeletal muscle, which can contribute to decreased functional capacity, and exercise intolerance. Previous studies show that supervised exercise rehabilitation programs are beneficial in the recovery phase of these patients but the exact effect of exercise on skeletal muscle activity is unknown. PURPOSE: To determine the effect of a medically supervised 12-wk exercise program on the EMG activity of the lower legs during the 6 min walk test. METHODS: 8 Patients with ischaemic heart disease and 12 healthy matched controls consented to partake in this study. Electrodes were placed on the vastus lateralis, vastus medialis, medial and lateral gastrocnemius muscles of the right leg. Resting heart rate (HR) and blood pressures (BP) were taken. They then walked around a 70 m track for 6 min, trying to cover as much distance as possible. HR and rating of perceived exertion were measured every minute during the test. Post 1 min recovery HR and BP was recorded. After 12 wks the same protocol was repeated. The EMG was normalized to the participants walking at a normal pace over 10 m. RESULTS: Patients showed a 19.7 % (± 104 m) improvement in distance covered Post rehabilitation (p=0.00), whereas the Controls did not improve. Additionally, average HR increased significantly from 97 ± 5 bpm to 112 ± 5 bpm during the 6 min walk test Post rehabilitation (p=0.007). The EMG activity was not significantly different between the Controls and Patients nor did EMG change during the 6 min walk test Post rehabilitation for all muscles; VM=115 ± 6.2% vs 124.6 ± 12.8%; VL=117.3 ± 5.2% vs 113.1 ± 14.1%; MG=116 ± 7.8% vs 129.7 ± 8.7%; LG=128.6 ± 6.4 vs 131.7 ± 8.4%. CONCLUSIONS: The findings of this study suggest that exercise tolerance improves following rehabilitation, yet EMG remains unchanged. Improvements in functional capacity could therefore be related to factors that relate to muscle efficiency or biomechanical advantage achieved through exercise training." @default.
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- W2326599839 date "2011-05-01" @default.
- W2326599839 modified "2023-10-17" @default.
- W2326599839 title "Efficiency Of Muscle Activity After Rehabilitation In Patients With Chronic Disease" @default.
- W2326599839 doi "https://doi.org/10.1249/01.mss.0000402116.98370.cb" @default.
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