Exercise and/or HMB in Older Diabetes With Low Muscle Mass

Inclusion Criteria: * Aged 60-80 ; * Diagnosis of T2DM * Low muscle mass: met a reference value for low muscle mass defined by the Asian Working Group for Sarcopenia (AWGS) criteria with skeletal muscle index \<5.7 kg/m2 for women and \<7.0 kg/m2 for men Exclusion Criteria: * Individuals who had an organic disease of the nervous system; * Who were restricted from engaging in exercise by a medical doctor; * Who was unconscious and unable to complete the questionnaire; * Who used other supplementations for muscle mass gain; * Who had impaired cardiac, kidney, or liver function.