Correlation between phase angle and loss of muscle mass in elderly diabetic patients / 中华老年医学杂志

ABSTRACT

Objective:To investigate the correlation between phase angle and muscle mass reduction in elderly diabetic patients.Methods:This paper retrospectively collected and analyzed the data of human composition and laboratory index in elderly patients with diabetes(n=106)and non-diabetic(n=153)patients in the Nutrition Department of Beijing Hospital, compared the differences between two groups, and explored the correlation between phase angle and muscle mass reduction in elderly diabetic patients.Phase angle was detected by bioelectrical impedance which was calculated as reactance/resistance× 180/π.Results:Phase angle was lower in elderly diabetic patients(5.17±0.65)°than in non-diabetic elderly patients(5.37±0.76)°( t=-2.075. P<0.05); age and fasting blood glucose were higher in elderly diabetic patients than in non-diabetic elderly patients(all P<0.05).There was no significant difference between the two groups in body mass index, fat, body fat percentage, visceral fat area, skeletal muscle index, body cell mass, total protein, albumin, and hemoglobin(all P>0.05).Correlation analysis results showed that in elderly diabetic patients, the phase angle was negatively correlated with body mass index( r=0.288, P<0.01), age( r=-0.680, P<0.01), was positively correlated with skeletal muscle( r=0.477, P<0.01), skeletal muscle index( r=0.505, P<0.01)and hemoglobin( r=0.382, P<0.01); and in the elderly non-diabetic group, phase angle was negatively correlated with age( r=-0.666, P<0.01)and positively correlated with body mass index( r=0.296, P<0.01), skeletal muscle( r=0.504, P<0.01), fat free mass( r=0.161, P<0.05), skeletal muscle index( r=0.441, P<0.01), body cell volume( r=0.496, P<0.01), and hemoglobin( r=0.420, P<0.01).The bioelectrical impedance apectroscopy detected skeletal muscle mass index<7.0 kg/m 2 for male and<5.7 kg/m 2 for female were used as the diagnosis standard for reduced muscle mass.The detection rate of muscle mass reduction was higher in elderly diabetic patients(17 cases, 16.04%)than in elderly non-diabetic patients(12 cases, 7.84%, χ2=4.229, P<0.05).The results of multiple regression analysis showed that the decrease of muscle mass in elderly diabetic patients was related to low phase angle( OR=0.413, 95% CI 0.280-0.973, P<0.05)and aging( OR=2.174, 95% CI 1.574-3.003, P<0.01). Conclusions:The phase angle is lower in diabetic elderly patients than in non-diabetic elderly patients, and the incidence of muscle mass reduction is higher in diabetic elderly patients than in non-diabetic elderly people.Decreased phase angle and increased age are related to the decrease of muscle mass in elderly diabetic patients.