Change in circulating cytokines after 2 forms of exercise training in chronic stable heart failure

Background A proinflammatory state is recognized in chronic heart failure and the degree of immune activation corresponds to disease severity and prognosis. Training is known to improve symptoms in heart failure but less is known about the effects of specific forms of training on the proinflammatory state. Methods Forty-six patients with stable chronic heart failure underwent a home-based program of exercise training for 30 minutes a day, 5 days per week over a 6-week period. Twenty-four used a bicycle ergometer and 22 used an electrical muscle stimulator applied to quadriceps and gastrocnemius muscles. Tumour necrosis factor-α (TNF-α), TNF-α soluble receptors 1 and 2, interleukin 6, and C-reactive protein were measured before and after the training period. Results Significant improvements in markers of exercise performance were seen in both training groups. Soluble TNF-α receptor 2 levels decreased after training in the bike group only (2900 ± 1069 pg/mL to 2625 ± 821 pg/mL, P = .013). Trends towards a decrease in levels of TNF-α and soluble receptor 1 were also seen in the bike group only. No change in circulating inflammatory markers was observed after stimulator training. Conclusions Physical training improves exercise capacity for patients with chronic heart failure but degree of attenuation of the proinflammatory response may depend on the mode of training despite similar improvements in exercise capacity.