Daily measurements of finger joint size, grip strength, and body weight have been made throughout 2 complete menstrual cycles in 7 female patients with rheumatoid arthritis and 6 healthy female controls. Sine wave analysis showed significant individual cyclical rhythms (p less than 0.05) for finger joint size (5 patients, 4 controls), nude weight (5 patients, 3 controls), and grip strength (4 p...

OBJECTIVE An in vivo rabbit model of repetitive joint flexion and loading was used to characterize the morphological effects of cyclical loading on articular cartilage. DESIGN The forepaw digits of eight anesthetized New Zealand White adult female rabbits were repetitively flexed at 1 Hz with a mean peak digit load of 0.42 N for 2 h per day for 60 cumulative hours. Metacarpophalangeal joints ...

SYNOPSIS Cyclical variations in monoamine oxidase activity during the human menstrual cycle, specific to the endometrium and modified in women undergoing contraceptive steroid treatment, may reflect changes in hormonal environment. Treatment of rats with individual constituents of the contraceptive pill causes analogous changes: oestrogens inhibit and progestogens potentiate uterine monoamine o...

According to Kostitch & Tele"bakovitch (1929), cyclical changes continue to occur in the vaginal smear of rats after removal of both ovaries. The following study was undertaken because of the important bearing this observation has on an understanding of the rhythmical changes which occur in the accessory reproductive organs, and because no reports of its confirmation have appeared in the litera...