I am interested in descriptions and discussion from the Apollo astronauts.
Almost all animals and many plants are sensitive to the earth's gravitational field. This is important for large mammals and particularly for large vertically-oriented bipeds. It can be quite a challenge to always keep one's center of gravity suitably positioned above one's feet. There are organs in the inner ear called otolith organs that are sensitive to gravitational fields and linear accelerations. However these organs seem primarily sensitive to changes in orientation of fields and perhaps to changes in magnitude of fields but not particularly to gauging the magnitude of static fields. The gravitational field is almost constant everywhere on the Earth, so there is no evolutionary pressure to be able to sense such a thing.
The Moon's gravity is less than 20% of the Earth's gravity. In other words, 80% of normal gravity is missing! That seems like a huge difference. However, astronauts on the Moon would have already experienced several days of zero gravity (plus some sudden bursts of deceleration prior to landing), so any direct comparison to Earth's field would be difficult. Mars' gravity is better at slightly less than 40% of Earth's gravity, but our intrepid astronauts will by then have spent six months of weightlessness plus a few minutes of terror! So Mars would probably feel just like home.
So the question specifically is as follows. When the Apollo astronauts were stationary and not moving around, could they tell they were in a much reduced gravitational field or did everything feel quite normal? Are there any first-hand comments or descriptions addressing this question?