To measure the effectiveness of our devices, it is enough to perform simple tests with the detection instrumentation.On a known route and with the same power, you will notice a decrease in HR (heart rate) and lactate, with a simultaneous increase in blood saturation.We recommend this test:After maximal effort, measure heart rate (HR) for 3 minutes every 30 seconds, 6 intervals in total. First day without device, next day with device. Just compare the results and you'll notice your HR will be lower and drop faster.To measure the frequency, a simple heart rate monitor is enough (the chest strap is the most accurate), for saturation a pulse oximeter or oximeter, while for lactate a lactic acid meter (more difficult to find).