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Müller, Julian; Bauer, Meret; Schneider, Simon R.; Mayer, Laura; Titz, Anna; Sturzenegger, Nico; Schwarz, Esther I.; Bauer, Christoph; Grünig, Ekkehard; Kohler, Malcolm; Lichtblau, Mona; Ulrich, Silvia
Archives of rehabilitation research and clinical translation, 06/2024, Volume: 6, Issue: 2Journal Article
To investigate the ventilatory and circulatory differences between eccentric (ECC) and concentric (CON) cycling exercise at submaximal, low-dose intensity from onset to end-exercise in healthy middle-aged participants. Randomized controlled crossover trial. The participants underwent 1 ECC and 1 CON test according to stepwise incremental exercise protocols at identical, submaximal intensities. Breath-by-breath analyses of ventilatory gas exchange and echocardiography were used to assess cardiopulmonary function during exercise. 24 healthy middle-aged, untrained participants (14 women, 10 men, 50±14 years) were included. 1 ECC and 1 CON test at submaximal intensities. The main outcome was oxygen uptake (V'O2). The V'O2 increase was reduced by -422 mL/min (-52%, 95% confidence interval: -513 to -292, P<.001) during ECC, as well as the ventilatory drive. Echocardiographic parameters, heart rate (-14%), cardiac output (-21%), stroke volume (-15%), and pulmonary artery pressure by tricuspid regurgitation pressure gradient (TRPG) (-26%) were also significantly reduced during ECC compared with CON at identical intensities. Participants reported significantly less dyspnea and unchanged perceived leg fatigue in ECC. ECC was well tolerated, and significant reductions were observed in V'O2, ventilation, and right ventricular load compared with CON, even at low intensity levels. This study, conducted on healthy middle-aged participants, did not raise concerns that would hinder further investigation of the effects of ECC in patients with severely limited cardiopulmonary disease, and it calls for further research on this topic.
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