Attenuated cardiovascular adjustment to sustained static exercise after carbohydrate loading.

摘要: Abstract We examined whether a higher plasma lactic acid (LA) concentration resulting from carbohydrate (CHO)-loading affects the cardiovascular responses to exercise through greater activation of LA-induced metaboreflex. Before and after CHO-loading, LA concentration, mean arterial blood pressure (MAP), heart rate (HR), cardiac output (CO), rating perceived exertion (RPE), integrated electromyogram (iEMG) vastus lateralis were studied during sustained static knee extension single legs in 16 volunteers. The CHO-loading comprised an exhaustive bout one-legged cycling (73±3% maximal oxygen uptake for 130–160 min) consuming low-CHO diet 2–3 days high-CHO next 3 days. In leg that performed (the experimental leg), was significantly increased, but magnitude MAP, HR, CO decreased parallel with significant reduction RPE iEMG. control leg, there no changes variables before CHO-loading. These results suggest increased did not affect adjustment exercise. Other mechanisms related iEMG seem be responsible attenuated observed