Abstract
The objective of this research is to test the physiological disorders of forearm caused by elbow covers. This was carried out by introducing the plethysmograph using the strain gauge method. In the experiments, variations of the blood stream in the finger tip was observed while using six kinds of elbow covers. These covers had been administered to four men and had an amplitude Vα and a relative period of initial rising t=b/λ observed in the plethysmogram. The results which include our previous findings regarded the same elbow cover with a relative degree of deformation A, restrictive pressure P, and α defined as feeling of restriction as indicated below:
(1) The value of b/λ increased by 17% for A, B and C covers. These were weak in their restrictive force. D, E and F covers were comparatively strong in their restrictive force and the decrease noted was 26%. This was while the elbow was stretched without using an elbow cover.
(2) The value of Vα decreased as the restrictive force increased and approached less than one third of this value without using an elbow cover when the elbow was kept bent D & F. In such a situation physiological disorder concerning the blood stream was observed.
(3) Relation between the value Vα and A, P, & α exit and those correlation coefficients are γVα with significance coefficient 5% and γVα with significance coefficient 1%. In particular, a regression formula P=313-95Vα exists between P and Vα.
