Abstract
Achilles tendon reflex, in normals, was studied with the photomotograph on 2100 (ages 18–89 yr) atomic bomb survivors and nonexposed controls of the Atomic Bomb Casualty Commission in Hiroshima to delineate effects of A-bomb radiation and aging. The reflex time was significantly prolonged, progressively, with age and it was more delayed in females than in males. The mean tap-to-half relaxation time was 290 ± 40 msec in males (mean age 46) and 321 ± 49 msec in females (mean age 46), which are similar to figures reported previously in Europe and the United States. In relation to radiation and obesity, no statistically significant difference in reflex time was found. These studies suggest that neurologic components of the reflex arc may be resistant to delayed effects of A-bomb radiation. Problems in interpreting reflex tracings and on differences in reflex time among races are discussed. Attention is called to age as an extrathyroidal factor in affecting achilles tendon reflex.
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