I just started on Results, and I was standing there in the kitchen reading the side of the container and saw "HMB". Well.. I'm not a nutrition expert, so I googled it. If this is all common knowledge that only I don't know, fair enough...
Effect of leucine metabolite -hydroxy--methylbutyrate on muscle metabolism during resistance-exercise training
S. Nissen, R. Sharp, M. Ray, J. A. Rathmacher, D. Rice, J. C. Fuller Jr., A. S. Connelly, and N. Abumrad
Iowa State University, Ames 50011; Metabolic Technologies Inc., Ames, Iowa 50010; MET-Rx Inc., Irvine, California 92715; and North Shore University Hospital, Manhasset, New York 11030
Received 18 August 1995; accepted in final form 1 July 1996.
Nissen, S., R. Sharp, M. Ray, J. A. Rathmacher, D. Rice, J. C. Fuller, Jr., A. S. Connelly, and N. Abumrad. Effect of leucine metabolite -hydroxy--methylbutyrate on muscle metabolism during resistance-exercise training. J. Appl. Physiol. 81(5): 2095-2104, 1996.The effects of dietary supplementation with the leucine metabolite -hydroxy--methylbutyrate (HMB) were studied in two experiments. In study 1, subjects (n = 41) were randomized among three levels of HMB supplementation (0, 1.5 or 3.0 g HMB/day) and two protein levels (normal, 117 g/day, or high, 175 g/day) and weight lifted for 1.5 h 3 days/wk for 3 wk. In study 2, subjects (n = 28) were fed either 0 or 3.0 g HMB/day and weight lifted for 2-3 h 6 days/wk for 7 wk. In study 1, HMB significantly decreased the exercise-induced rise in muscle proteolysis as measured by urine 3-methylhistidine during the first 2 wk of exercise (linear decrease, P < 0.04). Plasma creatine phosphokinase was also decreased with HMB supplementation (week 3, linear decrease, P < 0.05). Weight lifted was increased by HMB supplementation when compared with the unsupplemented subjects during each week of the study (linear increase, P < 0.02). In study 2, fat-free mass was significantly increased in HMB-supplemented subjects compared with the unsupplemented group at 2 and 4-6 wk of the study (P < 0.05). In conclusion, supplementation with either 1.5 or 3 g HMB/day can partly prevent exercise-induced proteolysis and/or muscle damage and result in larger gains in muscle function associated with resistance training.
That works for me.