No. of Recommendations: 1
IP says:"A sense of humor no doubt a bigger measure of expected survival than gait speed."

I disagree 🙂.

I think gait speed, as used in the OP article, is positively correlated with smoothly operating, painfree joints.

Gait speed is an INDICATOR of potential problems with the various organs and organ systems in the body.

One person close to me, had slow gait speed due to COPD and chronic emphysema.
Another, due to kidney failure.

I know quite a few folk with muscle OR tendon OR connective tissue malfunctions, who don't walk too good. Think fibromyalgia, chronic myofascial pain, MS, MD, ruptured/herniated/bulging disc, loss of menisci in the knee, damaged ligaments around the knee, etc.

Bone health issues such as bone-on-bone joints, bone spurs, calcified joints, improperly aligned bones, etc

Nerve issues such as sciatica, diabetic neuropathy, etc manifesting as pain which directly affects gait speed. (Don't forget that diabetes means the tissues of the leg and lower leg are not getting enough nutrients for proper functions either). How about nonpainful nerve malfunctions.

Balance issues whether neural due to inner ear problems, poorly functioning sensory nerve endings in feet, ankles, knees, hips, lower back, or any of the muscles, tendons, and other connective tissue, contribute to gait speed.

Improperly functioning muscles, joints, bones, etc implies that other (vital?) organs and organ systems are not free jctioning properly.

Stiffness and health conditions of muscles, tendons, connective tissues, and bone all affect the flexibility, smoothness, and ease of movement of joints.

I'm not surprised that study found a positive correlation between gait speed and death.

I suspect the correlation was even stronger prior to 1900.

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