title: The Effects of Beef, Chicken, or Whey Protein After Workout on Body Composition and Muscle Performance.
abstract: Sharp, MH, Lowery, RP, Shields, KA, Lane, JR, Gray, JL, Partl, JM, Hayes, DW, Wilson, GJ, Hollmer, CA, Minivich, JR, and Wilson, JM. The effects of beef, chicken, or whey protein after workout on body composition and muscle performance. J Strength Cond Res 32(8): 2233-2242, 2018-The purpose of this study was to determine the effects of postworkout consumption of beef protein isolate (Beef), hydrolyzed chicken protein (Chx), or whey protein concentrate (WPC), compared with a control on body composition and muscle performance during 8 weeks of resistance training. Forty-one men and women were randomized into 4 groups: WPC (m = 5, f = 5; age [years] = 19 ± 2, height [cm] = 171 ± 10, mass [kg] = 74.60 ± 14.19), Beef (m = 5, f = 5; age [years] = 22 ± 4, height [cm] = 170 ± 7, mass [kg] = 70.13 ± 8.16), Chx (m = 5, f = 6; Age [years] = 21 ± 2, height [cm] = 169 ± 9, mass [kg] = 74.52 ± 13.83), and Maltodextrin (control) (m = 4, f = 6; age [years] = 21 ± 2, height [cm] = 170 ± 9, mass [kg] = 73.18 ± 10.96). Subjects partook in an 8-week periodized resistance training program. Forty-six grams of protein or a control were consumed immediately after training or at similar times on off-days. Dual-energy x-ray absorptiometry was used to determine changes in body composition. Maximum strength was assessed by 1 repetition maximum for bench press (upper body) and deadlift (lower body). Power output was measured using cycle ergometer. Whey protein concentrate (52.48 ± 11.15 to 54.96 ± 11.85 kg), Beef (51.68 ± 7.61 to 54.65 ± 8.67 kg), and Chx (52.97 ± 12.12 to 54.89 ± 13.43 kg) each led to a significant increase in lean body mass compared with baseline (p < 0.0001), whereas the control condition did not (53.14 ± 11.35 to 54.19 ± 10.74 kg). Fat loss was also significantly decreased at 8 weeks compared to baseline for all protein sources (p < 0.0001; WPC: 18.70 ± 7.38 to 17.16 ± 7.18 kg; Beef: 16.43 ± 5.71 to 14.65 ± 5.41 kg; Chx: 17.58 ± 5.57 to 15.87 ± 6.07 kg), but not the control condition (16.29 ± 7.14 to 14.95 ± 7.72 kg). One repetition maximum for both deadlift and bench press was significantly increased for all treatment groups when compared with baseline. No differences in strength were noted between conditions. Overall, the results of this study demonstrate that consuming quality sources of protein from meat or WPC lead to significant benefits in body composition compared with control.
authors.affiliation: Applied Science and Performance Institute, Tampa, Florida.
authors.forename: Matthew H
authors.initials: MH
authors.lastname: Sharp
authors.affiliation: Applied Science and Performance Institute, Tampa, Florida.
authors.forename: Ryan P
authors.initials: RP
authors.lastname: Lowery
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Kevin A
authors.initials: KA
authors.lastname: Shields
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Lane
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Jocelyn L
authors.initials: JL
authors.lastname: Gray
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Partl
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Hayes
authors.affiliation: Maximum Human Performance, West Caldwell, New Jersey.
authors.forename: Gabriel J
authors.initials: GJ
authors.lastname: Wilson
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Chase A
authors.initials: CA
authors.lastname: Hollmer
authors.affiliation: Department of Health Sciences and Human Performance, The University of Tampa, Tampa, Florida.
authors.forename: Julie R
authors.initials: JR
authors.lastname: Minivich
authors.affiliation: Applied Science and Performance Institute, Tampa, Florida.
authors.forename: Jacob M
authors.initials: JM
authors.lastname: Wilson
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D000328:Adult; D000818:Animals; D001823:Body Composition / Q000187:drug effects*; D002417:Cattle; D002645:Chickens; D019587:Dietary Supplements; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D053580:Muscle Strength; D018482:Muscle, Skeletal / Q000187:drug effects / Q000502:physiology; D011134:Polysaccharides / Q000494:pharmacology; D000069466:Red Meat; D055070:Resistance Training; D000067816:Whey Proteins / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D011134:Polysaccharides; D000067816:Whey Proteins; C008315:maltodextrin