A single subject, two tests, weeks apart — what the heart rate says
Two whole-body endurance tests on the same athlete, weeks apart, conducted at a sports-medical center in Yokohama. The cardiovascular signature, quietly, has changed.
Umehara Nozomi is 38, 170 cm, 58 kg, 5.8% body fat. He runs. The Yokohama Sports Medical Center ran a whole-body endurance test — seven progressive treadmill stages of three minutes each, with blood lactate and heart rate sampled at every stage. He had taken the same test two weeks earlier.
Reading the chart
At every stage of the seven-stage test, today’s heart rate is lower than it was previously. Stage 1: 121 vs. 122. Stage 4: 149 vs. 158. Stage 7, the hardest: 177 vs. 183. The whole curve has shifted down.
Lactate values at the higher intensities are slightly elevated relative to the prior test; the lower-intensity response is broadly similar. The report’s reading is straightforward: cardiovascular efficiency has clearly improved at the same running speeds.
What we are not claiming
This is one subject, two tests. It is not a placebo-controlled study and we do not present it as one. We share it because the Yokohama report is the cleanest sports-medical picture we have of what the bonito-peptide protocol looks like under a lactate-curve test.
Take it as a single, well-instrumented data point in a longer reading list.