Biological motion during inflammation in humans.

Area of Science:

• Human physiology
• Biomedical engineering
• Perception science

Background:

• Biological motion provides insights into an individual's internal state.
• Inflammation can affect gait, posture, and mobility, but specific changes are uncharacterized.

Purpose of the Study:

• To investigate the impact of induced systemic inflammation on human gait and biological motion.
• To identify specific kinematic and spatio-temporal gait parameters affected by inflammation.

Main Methods:

• Induced systemic inflammation in 19 healthy volunteers using lipopolysaccharide (LPS).
• Assessed biological motion parameters (walking speed, stride length/time, joint angles) during walking and Timed-Up-and-Go (TUG) tests.
• Measured cytokine levels, body temperature, and sickness symptoms.

Main Results:

• Inflammation led to shorter, slower, wider strides, reduced arm extension, less knee flexion, and a downward head tilt.
• Participants showed slower TUG performance and a shorter first step.
• Higher interleukin-6 levels, increased sickness, and lower body temperature correlated with altered motion.

Conclusions:

• Biological motion parameters clearly reflect an individual's inflammatory status.
• Observed gait alterations may serve as indicators of sickness, detectable by humans or AI.