Bone properties and muscle strength of young haemophilia patients
Article first published online: 12 JUL 2005
Volume 11, Issue 4, pages 380–386, July 2005
How to Cite
Falk, B., Portal, S., Tiktinsky, R., Zigel, L., Weinstein, Y., Constantini, N., Kenet, G., Eliakim, A. and Martinowitz, U. (2005), Bone properties and muscle strength of young haemophilia patients. Haemophilia, 11: 380–386. doi: 10.1111/j.1365-2516.2005.01116.x
- Issue published online: 12 JUL 2005
- Article first published online: 12 JUL 2005
- Accepted after revision 26 May 2005
- bone strength;
- bone ultrasound;
- skeletal muscle
Summary. Purpose: To evaluate bone properties, muscle strength and the relationship between the two, in young (7.0–17.7 years) haemophilia patients (h) and healthy boys (c).
Subjects: Twenty-seven boys with severe haemophilia and 33 healthy boys, of similar age, body mass, height, (mean ± sd for h and c, respectively: 11.2 ± 3.2 vs. 11.4 ± 2.9 years, 42.6 ± 16.6 vs. 41.6 ± 17.3 kg, 145 ± 18 vs. 146 ± 17 cm) and pubertal stage according to secondary sex characteristics, volunteered for the study. all subjects were physically inactive (as determined by questionnaire).
Methods: Subjects performed isokinetic elbow and knee extension and flexion tests at two angular velocities (biodex system ii dynamometer). Bone properties were evaluated by qualitative ultrasound (sunlight omnisenseTM), at the distal radius and tibial mid-shaft. H subjects received prophylactic factor viii treatment within the 24 h preceding testing. No test was performed in the presence of haemorrhage.
Results: Muscle strength was consistently higher in c compared with h, especially in the lower limbs (e.g. knee extension: 1.80 ± 0.44 vs 1.48 ± 0.53 N·m·kg−1 body mass, respectively, p = 0.01). No differences were observed in tibial or radial speed of sound between groups. Correlations between muscle strength and bone properties were observed only in the lower limbs and only in c (r = 0.37–0.48).
Conclusion: Muscle strength, especially lower limbs’ strength, was lower in haemophilia patients compared with a matched, similarly inactive population of healthy boys. Nevertheless, at this age range, this relative weakness is not associated with inferior bone properties.