Fig. 2.

Near-infrared-derived oxygenated (Oxy; A), deoxygenated (Deoxy; B), and total (C) hemoglobin (Hb)/myoglobin (Mb) at rest and throughout the incremental handgrip exercise protocol. Rhythmic handgrip began with a fixed workload of 10 kg and progressed by 3 kg every 3 min thereafter. Data are reported as means ± SE; n = 8. Oxygenated hemoglobin/myoglobin remained unchanged from rest throughout exercise, whereas deoxygenated and total hemoglobin/myoglobin increased with graded exercise (P < 0.01 for both).