TY - JOUR
T1 - Behavior of the muscle quality index and isometric strength in elderly women
AU - Jerez-Mayorga, Daniel
AU - Delgado-Floody, Pedro
AU - Intelangelo, Leonardo
AU - Campos-Jara, Christian
AU - Arias-Poblete, Leonidas
AU - García-Verazaluce, Juan
AU - Garcia-Ramos, Amador
AU - Chirosa, Luis Javier
PY - 2020/12/1
Y1 - 2020/12/1
N2 - This study aimed (I) to compare the muscle quality index (MQI) and the isometric hip strength between younger and older women, and (II) to determine the relationship of the MQI with the sit-to-stand test (STS) and isometric hip strength in younger and older women. Twenty-eight elderly women (age= 66.2 ± 5.6 years) and twenty younger women (21.2 ± 2.2 years) participated in the study. The following dependent variables were measured: MQI, STS, body composition, and the peak isometric strength of the hip (PF) which was also normalized using three different methods (PF/Body Mass, PF/Fat-Free Mass, and PF/Body Mass0,335). Older women presented a lower PF in hip flexion, extension and external rotation regardless of the method of normalization (p < 0.001), but the PF of hip abductors and internal rotators was higher for older women (p < 0.05). No significant differences were found in the MQI between older and younger women (p = 0.443). The MQI was negatively correlated with the time in the STS in older women (r = -0.706, p < 0.001) and younger women (r = -0.729, p < 0.001), while the correlations of MQI with isometric hip strength were weaker in older women (r range: -0.082 – 0.556) and younger women (r range: -0.020 – 0.309). MQI is a clinical and practical tool to assess the muscular power of the lower extremities.
AB - This study aimed (I) to compare the muscle quality index (MQI) and the isometric hip strength between younger and older women, and (II) to determine the relationship of the MQI with the sit-to-stand test (STS) and isometric hip strength in younger and older women. Twenty-eight elderly women (age= 66.2 ± 5.6 years) and twenty younger women (21.2 ± 2.2 years) participated in the study. The following dependent variables were measured: MQI, STS, body composition, and the peak isometric strength of the hip (PF) which was also normalized using three different methods (PF/Body Mass, PF/Fat-Free Mass, and PF/Body Mass0,335). Older women presented a lower PF in hip flexion, extension and external rotation regardless of the method of normalization (p < 0.001), but the PF of hip abductors and internal rotators was higher for older women (p < 0.05). No significant differences were found in the MQI between older and younger women (p = 0.443). The MQI was negatively correlated with the time in the STS in older women (r = -0.706, p < 0.001) and younger women (r = -0.729, p < 0.001), while the correlations of MQI with isometric hip strength were weaker in older women (r range: -0.082 – 0.556) and younger women (r range: -0.020 – 0.309). MQI is a clinical and practical tool to assess the muscular power of the lower extremities.
KW - Functional electromechanical dynamometer
KW - Muscle quality
KW - Resistance exercise
KW - Sit-to-stand test
UR - http://www.scopus.com/inward/record.url?scp=85089754571&partnerID=8YFLogxK
U2 - 10.1016/j.physbeh.2020.113145
DO - 10.1016/j.physbeh.2020.113145
M3 - Article
C2 - 32822709
AN - SCOPUS:85089754571
SN - 0031-9384
VL - 227
JO - Physiology and Behavior
JF - Physiology and Behavior
M1 - 113145
ER -