The effect of animal versus plant protein on muscle mass, muscle strength, physical performance and sarcopenia in adults: protocol for a systematic review

Table 1 Inclusion and exclusion criteria for study screening

Variable	Criteria	Include	Exclude
Language	English	X
Study design	Randomised controlled trial	X
Study design	Cohort studies, acute/mechanistic studies, reviews, protocols, conference abstracts		X
Population	Adults aged 18+	X
Population	Children; pregnant women		X
Setting	Community; care homes for older adults	X
Setting	Hospitalised patients		X
Duration	≥ 4 weeks	X
Intervention	Plant protein supplement or diet	X
Comparator	Animal protein supplement or diet (similar protein and energy content to intervention)	X
Outcome(s)	Muscle mass, muscle strength, physical performance, sarcopenia. Measured by one of the listed methods in Table 2	X
Comorbidities	Non-alcoholic fatty liver disease; diabetes mellitus	X
Comorbidities	Chronic kidney disease, cancer, malnutrition, Crohn’s disease, rheumatoid arthritis, fibromyalgia, HIV		X

ISSN: 2046-4053