This systematic review highlights the effects of dairy products on muscle mass , muscle strength and body performance in the elderly population in the perspective of Ca , P , vitamin D and protein
The risk of sarcopenia increases with aging .
Malnutrition in the elderly population is an important risk factor for sarcopenia .
Calcium ( Ca ) , phosphate ( P ) , vitamin D and protein are key nutrients for the human body and affect muscle mass and quality .
Dairy products are rich in these nutrients , which implicates that dairy products might be ideal for elderly population .
Soy-Dairy Protein Blend or Whey Protein Isolate Ingestion Induces Similar Postexercise Muscle Mechanistic Target of Rapamycin Complex 1 Signaling and Protein Synthesis Responses in Older Men1234
Background : Previous work demonstrated that a soy-dairy protein blend ( PB ) prolongs hyperaminoacidemia and muscle protein synthesis in young adults after resistance exercise . Objective : We investigated the effect of PB in older adults . We hypothesized that PB would prolong hyperaminoacidemia , enhancing mechanistic target of rapamycin complex 1 ( mTORC1 ) signaling and muscle protein anabolism compared with a whey protein isolate ( WPI ) . Methods : This double-blind , r and omized controlled trial studied men 55–75 y of age . Subjects consumed 30 g protein from WPI or PB ( 25 % soy , 25 % whey , and 50 % casein ) 1 h after leg extension exercise ( 8 sets of 10 repetitions at 70 % one-repetition maximum ) . Blood and muscle amino acid concentrations and basal and postexercise muscle protein turnover were measured by using stable isotopic methods . Muscle mTORC1 signaling was assessed by immunoblotting . Results : Both groups increased amino acid concentrations ( P < 0.05 ) and mTORC1 signaling after protein ingestion ( P < 0.05 ) . Postexercise fractional synthesis rate ( FSR ; P ≥ 0.05 ) , fractional breakdown rate ( FBR ; P ≥ 0.05 ) , and net balance ( P = 0.08 ) did not differ between groups . WPI increased FSR by 67 % ( mean ± SEM : rest : 0.05 % ± 0.01 % ; postexercise : 0.09 % ± 0.01 % ; P < 0.05 ) , decreased FBR by 46 % ( rest : 0.17 % ± 0.01 % ; postexercise : 0.09 % ± 0.03 % ; P < 0.05 ) , and made net balance less negative ( P < 0.05 ) . PB ingestion did not increase FSR ( rest : 0.07 % ± 0.03 % ; postexercise : 0.09 % ± 0.01 % ; P ≥ 0.05 ) , tended to decrease FBR by 42 % ( rest : 0.25 % ± 0.08 % ; postexercise : 0.15 % ± 0.08 % ; P = 0.08 ) , and made net balance less negative ( P < 0.05 ) . Within-group percentage of change differences were not different between groups for FSR , FBR , or net balance ( P ≥ 0.05 ) . Conclusions : WPI and PB ingestion after exercise in older men induced similar responses in hyperaminoacidemia , mTORC1 signaling , muscle protein synthesis , and breakdown . These data add new evidence for the use of whey or soy-dairy PBs as targeted nutritional interventions to counteract sarcopenia . This trial was registered at clinical trials.gov as NCT01847261
This systematic review highlights the effects of dairy products on muscle mass , muscle strength and body performance in the elderly population in the perspective of Ca , P , vitamin D and protein
The risk of sarcopenia increases with aging .
Malnutrition in the elderly population is an important risk factor for sarcopenia .
Calcium ( Ca ) , phosphate ( P ) , vitamin D and protein are key nutrients for the human body and affect muscle mass and quality .
Dairy products are rich in these nutrients , which implicates that dairy products might be ideal for elderly population .