Fig. 7: Near-infrared spectroscopy images of the head (face) and neck in a healthy, 28-year-old female subject. | npj Microgravity

Fig. 7: Near-infrared spectroscopy images of the head (face) and neck in a healthy, 28-year-old female subject.

From: Using noninvasive imaging to assess manual lymphatic drainage on lymphatic/venous responses in a spaceflight analog

Fig. 7

All assessments were taken while in head-down tilt (HDT) position, except for the post-225 min timepoint, when the subject was seated for 30 min. The color reference scale demonstrates the level of tissue oxygenation saturation on a percentage scale (oxygenation increases as levels approach red and decreases as levels approach blue). A visible reduction of tissue oxygenation levels proportional to the amount of time in spent in HDT position was observed. Interestingly, the tissue oxygenation visual levels of the neck appeared to increase over time while in the HDT position, but after manual lymphatic drainage (MLD) at both post-195 min in the HDT position and post-225 min in the sitting position, levels appeared to decrease in intensity.

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