TY - JOUR
T1 - Relative impact of neuromuscular and cardiovascular factors on bone strength index of the hemiparetic distal radius epiphysis among individuals with chronic stroke
AU - Pang, Marco Yiu Chung
AU - Cheng, A. Q.
AU - Warburton, D. E.
AU - Jones, A. Y M
PY - 2012/9/1
Y1 - 2012/9/1
N2 - Summary The objective of this study was to examine the associations of neuromuscular and cardiovascular impairments with the bone strength index of the hemiparetic distal radius epiphysis in chronic stroke survivors. The results showed that grip strength is the most predominant predictor of the bone strength index. Introduction The pupose of the study was to examine the associations of neuromuscular and cardiovascular impairments with the bone strength index of the hemiparetic distal radius epiphysis in chronic stroke survivors. Methods Sixty-five chronic stroke survivors and 34 healthy control subjects underwent scanning of the distal radius epiphyseal site on both sides using peripheral quantitative computed tomography to measure trabecular volumetric bone mineral density (vBMD) (mg/cm3), total vBMD (mg/cm3), total area (mm2), and compressive bone strength index (cBSI) (g 2/cm4). Various indicators of neuromuscular (grip strength, spasticity) and cardiovascular function (vascular elasticity, oxygen consumption during 6-min walk test) were evaluated. Results Analysis of variance revealed a significant main effect of side (p<0.001) and group×side interaction (p<0.05) for total BMC, total vBMD, trabecular vBMD, and cBSI (p<0.05), with the stroke group showing greater side-to-side difference in these variables. However, no significant side-toside difference in total area was detected in either group (p≥0.05). Sex-specific analysis yielded similar results. Multiple regression analyses revealed that the cBSI of the hemiparetic distal radius epiphysis had a stronger association with neuromuscular factors than cardiovascular factors. Overall, grip strength was the strongest determinant of the cBSI of the hemiparetic distal radius epiphysis (p<0.01). Conclusions Muscle weakness is the most predominant determinant of cBSI in the hemiparetic distal radius epiphysis among chronic stroke patients. Future studies should investigate the efficacy of different muscle-strengthening strategies in enhancing bone strength of this skeletal site in the chronic stroke population.
AB - Summary The objective of this study was to examine the associations of neuromuscular and cardiovascular impairments with the bone strength index of the hemiparetic distal radius epiphysis in chronic stroke survivors. The results showed that grip strength is the most predominant predictor of the bone strength index. Introduction The pupose of the study was to examine the associations of neuromuscular and cardiovascular impairments with the bone strength index of the hemiparetic distal radius epiphysis in chronic stroke survivors. Methods Sixty-five chronic stroke survivors and 34 healthy control subjects underwent scanning of the distal radius epiphyseal site on both sides using peripheral quantitative computed tomography to measure trabecular volumetric bone mineral density (vBMD) (mg/cm3), total vBMD (mg/cm3), total area (mm2), and compressive bone strength index (cBSI) (g 2/cm4). Various indicators of neuromuscular (grip strength, spasticity) and cardiovascular function (vascular elasticity, oxygen consumption during 6-min walk test) were evaluated. Results Analysis of variance revealed a significant main effect of side (p<0.001) and group×side interaction (p<0.05) for total BMC, total vBMD, trabecular vBMD, and cBSI (p<0.05), with the stroke group showing greater side-to-side difference in these variables. However, no significant side-toside difference in total area was detected in either group (p≥0.05). Sex-specific analysis yielded similar results. Multiple regression analyses revealed that the cBSI of the hemiparetic distal radius epiphysis had a stronger association with neuromuscular factors than cardiovascular factors. Overall, grip strength was the strongest determinant of the cBSI of the hemiparetic distal radius epiphysis (p<0.01). Conclusions Muscle weakness is the most predominant determinant of cBSI in the hemiparetic distal radius epiphysis among chronic stroke patients. Future studies should investigate the efficacy of different muscle-strengthening strategies in enhancing bone strength of this skeletal site in the chronic stroke population.
KW - Cerebrovascular accident
KW - Hemiplegia
KW - Muscle
KW - Osteoporosis
KW - Rehabilitation
UR - http://www.scopus.com/inward/record.url?scp=84867103711&partnerID=8YFLogxK
U2 - 10.1007/s00198-012-1899-8
DO - 10.1007/s00198-012-1899-8
M3 - Journal article
C2 - 22310956
SN - 0937-941X
VL - 23
SP - 2369
EP - 2379
JO - Osteoporosis International
JF - Osteoporosis International
IS - 9
ER -