rct of combination effect of vibration treatment and hmb supplementation on myosteatosis and nmj degeneration

Conditions: Sarcopenia; Connective Tissue Diseases in Old Age; Musculoskeletal Abnormalities

Summary: the investigators' pre-clinical study confirms the positive effects of combined treatment (vt + hmb) on reducing fat-to-lean tissue ratio, intramuscular fat infiltration and increasing muscle strength in sarcopenia animal model. the results showed that fat mass could be decreased by \~32%, while histology oil red o staining indicated a decrease of fat by almost 60%; in contrast, lean muscle mass increased by \~14%. on muscle strength, combined treatment increased twitch force, tetanic force and grip strength by \~30-66%. these in vivo results are very encouraging and the investigators should explore its potential in clinical translation. as vt and hmb supplement have been commercially available and their compliance rates are satisfactory, they can be translated to clinical application easily. the investigators' next step is to confirm its clinical efficacy, so that sarcopenia becomes a new indication of vt and hmb. the hypothesis is that combined treatment of vt and hmb can retard the progression of sarcopenia in human, in terms of muscle mass, muscle strength and performance.

in this study, a single-blinded rct is to investigate the effect of combination treatment of vt and hmb on hand grip, gait speed, muscle mass (dxa) in sarcopenic subjects. subjects over age of 65 will be screened by performing sarc-f, handgrip, gait speed and bioelectric impedance assessment (bia) based on awgs definition. the participants failed in awgs algorithm will be invited to join the research. exclusion criteria are those with (1)pathological bone diseases, (2) chronic inflammatory conditions (e.g. rheumatoid arthritis), (3) neurological problems affecting gait, (4) taking regular supervised exercise training for more than 3 times/week, (5) chair-bound or bed-bound, and (6) malignancy. recruited subjects will be randomized to either (1) control, (2) hmb only, (3) vt only or (4) hmb +vt group. all subjects will be given protein supplement to ensure minimal daily protein intake. subject assigned to vt group will receive vt (35hz, 0.3g, 20min/day, at least 3 times/week) for 6 months. subjects assigned to hmb group will take hmb capsules 3g/day for 6 months. subjects assigned to hmb+vt group will recieve both vt and hmb supplements for 6 months. the primary outcome is muscle strength showing subjects' functional ability. all primary and secondary outcome assessments for all groups will be performed in the investigators' institute at baseline, 3 months and 6 months post-treatment.

Eligibility criteria:
inclusion criteria: * subjects aged 60 years or above * subjects failed in awgs algorithm 1. skeletal muscle mass by bia (male at \<7.0 kg/m\^2, female at \<5.7 kg/m\^2), and 2. handgrip strength (male at \<28 kg, female at \<18kg), and/or 3. gait speed test (\>1m/s) exclusion criteria: * subjects with pathological bone diseases * subjects with chronic inflammatory condition (e.g. rheumatoid arthritis) * subjects with neurological problems * subjects receiving regular exercise * subjecs who are chair-/bed- bound * subjects with malignancy * subjects with cardiovascular concern such as with pace-maker in-situ * subjects with acute fractures or severe osteoarthritis

Keywords: sarcopenia vibration hydroxymethylbutyrate