It seems that within the same muscle there are different types of muscle fibre carrying out different functions. This can be clearly seen in the third experiment with the marching on the spot. The tightness of muscles on the side where the leg has been lifted shows (a) that movement has been carried out and (b) that the weight of the limb has been borne by these muscles. The relatively relaxed state of the muscles in the opposite side shows that posture maintaining or indirect weight-bearing muscles carry out their functions without tightening. Thus inside one large muscle or muscle group there are different types of muscle fibres carrying out separate functions.

Medical science has not dealt with this aspect of the functionally different muscle fibres. It has gone as far as describing slow, intermediate and fast muscle fibres but not as far as classifying muscle fibres into the ones that shrink and the ones that don't. Clearly, there seem to be two or possibly more types of muscle fibres. Nobody has proved it but logically it seems to be true.

It seems that the muscle fibres that support posture do not need to tighten up into a hard 'knot' when 'contracting'. Even when extra weight is added on, they don't seem to tighten up at all. Weightlifters when lifting heavy weights experience tightness of the back muscles only when they lift the weight from the stand to the overhead position, but once they have achieved their final static position and the spine is erect, the back muscles return to normal tone and don't feel tight any more. One can try a similar experiment with a partner who puts the thumbs on the lumbar muscles to feel their tightness or softness during lifting of a heavy object from the ground to over the head.

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Pain Relief-Muscle Relaxers