Research Paper Volume 9, Issue 1 pp 52—67

Figure 4. The effect of superimposing reactive hyperemia on the recovery from plantar flexion exercise on the relationship between microvascular partial pressure of O₂ (PO₂) and initial post exercise PCr resynthesis rate, an index of O₂ utilization, in the context of diffusive and convective O₂ transport. Muscle O₂ utilization was inferred from the initial post exercise PCr resynthesis rate as this process is derived almost exclusively from oxidative phosphorylation [22]. Microvascular PO₂ was derived from the tissue oxygen index [23], assuming that the near infrared spectroscopy signal mainly originates from hemoglobin [24], and then computed from the O₂-hemoglobin dissociation curve [25]. Oxygen consumption, VO₂; blood flow, Q; arterial oxygen content, CaO₂; venous oxygen content, CvO_2; diffusional conductance, DO₂; Mean Capillary PO₂, PCapO₂.