Abstract
Objective—To investigate whether localised skeletal muscle training, which does not have a great influence on the heart, improves abnormalities of calf muscle metabolism in patients with chronic heart failure. Methods—Seven cardiac patients in New York Heart Association class II and III undertook a random order crossover trial. Training consisted of unilateral calf plantar flexion exercise. Before and after training, the patients' metabolic responses were examined during the calf exercise test with phosphorus-31 nuclear magnetic resonance spectroscopy (31P-MRS) and calf blood flow with plethysmography. The new Borg scale was employed as a subjective fatigue scale. Results—In a constant load exercise test (70% of maximum load achieved during the incremental exercise), standardised phosphocreatine and intracellular pH decreased less after training (p < 0.05, repeated measures analysis of variance). The new Borg scale improved significantly after training (p < 0.05). Blood flow did not change significantly in either test. Conclusions—In patients with chronic heart failure, localised calf skeletal muscle training improved oxidative capacity without changes in calf blood flow. This training also improved the subjective fatigue scale. This training method may therefore alleviate leg fatigue experienced in daily activities. Keywords: heart failure; magnetic resonance spectroscopy; skeletal muscle; localised training
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Figure 1 .
Comparison of standardised phosphocreatine (PCr) utilisation (A) and intracellular pH (B) in incremental exercise between patients with chronic heart failure and normal control subjects. There was no significant difference between the two groups in either standardised PCr or intracellular pH by repeated measures analysis of variance (ANOVA). Data on exercise ranging from 0 to 9 J/min/cm2 are presented. Since all patients could complete at least 6 J/min/cm2, data for 0 to 6 J/min/cm2 were used to compare these two groups by repeated measures ANOVA. When matched points were compared, both standardised PCr values and intracellular pH were significantly different at 5 to 9 J/min/cm2. *p < 0.05, †p < 0.01, compared by unpaired t test. Empty squares, normal control subjects; filled squares, patients with chronic heart failure.
Figure 2 .
Comparison of standardised phosphocreatine (PCr) utilisation (A) and intracellular pH (B) in constant load exercise test between patients with chronic heart failure and normal control subjects. Patients showed more depletion than normal control subjects by repeated measures analysis of variance (ANOVA). Comparing matched points, standardised PCr values were significantly different at 2 to 6 minutes, and intracellular pH at 1 to 6 minutes. ‡p = 0.01, ¶p < 0.01 by repeated measures ANOVA; *p < 0.05, †p < 0.01, compared by unpaired t test. Empty squares, normal control subjects; filled squares, patients with chronic heart failure.
Figure 3 .
Effects of localised training on standardised phosphocreatine (PCr) utilisation (A) and intracellular pH (B) in constant load exercise test. There was less standardised PCr depletion as well as less intracellular pH reduction after training. ‡p < 0.05, compared by repeated measures analysis of variance. *p < 0.05, †p < 0.01, comparing matched points by paired t tests. Empty circles, training phase; filled circles, detraining phase.
Figure 4 .
Effects of localised training on calf blood flow in constant load exercise test. There was no difference between the training phase and the detraining phase by repeated measures analysis of variance (p = NS). Comparing matched points, there were no significant changes. Empty circles, training phase; filled circles, detraining phase.
Selected References
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