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Is there a relationship between muscle fatigue resistance and cardiovascular responses to isometric exercise in mild chronic heart failure?
Author(s) -
Carrington Charlotte A.,
Fisher Wendy J.,
Davies Michael K.,
White Michael J.
Publication year - 2001
Publication title -
european journal of heart failure
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.149
H-Index - 133
eISSN - 1879-0844
pISSN - 1388-9842
DOI - 10.1016/s1388-9842(00)00112-4
Subject(s) - isometric exercise , medicine , heart failure , cardiology , muscle fatigue , skeletal muscle , ejection fraction , contraction (grammar) , electromyography , physical medicine and rehabilitation
Background: Exercise intolerance in chronic heart failure (CHF) may be due to altered fatigue resistance and muscle afferent input to the cardiovascular system from dysfunctional skeletal muscle. Aim: To determine whether calf muscle fatigue resistance was associated with the magnitude of a muscle afferent driven cardiovascular response to isometric exercise. Methods and results: Cardiovascular responses were recorded in eight stable CHF patients (ejection fraction 20–40%) and nine healthy, age‐matched controls during voluntary and electrically evoked isometric plantar flexion and post‐exercise circulatory occlusion. The force developed by the plantar flexors during a 2‐min submaximal electrically evoked fatigue test was measured. There was no relationship between ischaemic muscle fatigue and cardiovascular changes during and after voluntary contraction in either group nor evoked contraction in the CHF group. In the control group, the change in diastolic blood pressure (DBP) at the end of evoked contraction was related to the severity of fatigue at 90 s and 120 s (FI=0.01ΔDBP+0.3, r =0.81, P <0.05 and FI=0.02ΔDBP+0.8, r =0.84, P <0.01, respectively). Conclusion: Muscle fatigue resistance did not relate to the magnitude of the cardiovascular stress generated by isometric exercise of the same muscle in these patients.