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© 1990 British Society for Rheumatology

other

A LABORATORY AND CLINICAL STUDY OF PNEUMATIC ‘GRIP STRENGTH’ DEVICES

A. UNSWORTH, I. HASLOCK, V. VASANDAKUMAR and J. STAMP

Centre for Biomedical Engineering, University of Durham and the Department of Rheumatology, South Cleveland Hospital

Correspondence to: Correspondence to Prof A. Unsworth, School of Engineering and Applied Science, Science Laboratories, South Road, Durham DH1 3LE

The use of inflated bags or cuffs to measure grip strength is now a well established technique. The method does have a number of problems. Bags of different diameter and volume were seen to give statistically significantly different pressure readings when squeezed by the same subjects. Different initial pressures (from 20 mmHg to 60 mmHg) also gave significantly differ ent results both in laboratory tests on a materials testing machine and when patients with rheumatoid arthritis squeezed the bag. The technique of squeezing also affected the results. Despite the intrinsic drawbacks of the system, it is likely to remain in general use because of familiarity and convenience. We recommend the minimum details required when prieumodyna mometer-derived data are published.

KEY WORDS: Grip strength, Pneumatic bags, Inflated cuffs, Pneumodynamometer


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