Elastic-band resistance exercise or vibration treatment in combination with hydroxymethylbutyrate (HMB) supplement for management of sarcopenia in older people: a study protocol for a single-blinded randomised controlled trial in Hong Kong

弹性带阻力训练或振动疗法联合羟甲基丁酸（HMB）补充剂治疗老年人肌肉减少症：香港一项单盲随机对照试验的研究方案