| 摘要 |
<p>A method of obtaining a fitness index is proposed, representing the ability of one's own muscles to move one's own mass. A suitable movement is that of standing up from a knees-bent position, against gravity. A suitable measure of the motion is its vertical component of peak acceleration. The acceleration may be measured directly, as by an accelerometer attached to a suitable part of the body, or indirectly from the vertical components of displacement or velocity as functions of time. It may also be calculated using Newton's laws, from the mass involved in the motion and the force exerted by the muscles; this approach allows the fitness index to be obtained from a modified form of conventional bathroom scales.</p> |
