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© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Many studies have evaluated the effects of resistance training (RT) and protein intake to attenuate the age-related loss of skeletal muscle. However, the effects of graded protein intake with conjunctive RT in older adults are unclear. Older adults (n = 18) performed 10 weeks of whole-body RT with progressions to intensity and volume while consuming either a constant protein (CP) diet (0.8–1.0 g/kg/d) with no protein supplement or a graded protein (GP) diet progressing from 0.8 g/kg/d at week 1 to 2.2 g/kg/d at week 10 with a whey protein supplement. Data were collected prior to commencement of the RT protocol (PRE), after week 5 (MID), and after week 10 (POST). Dual Energy X-ray Absorptiometry derived lean/soft tissue mass, ultrasonography derived muscle thickness, and a proxy of muscle quality were taken at PRE and POST, while isokinetic dynamometry derived peak torque were taken at PRE, MID, and POST. This study demonstrated the feasibility of the RT protocol (attendance = 96%), and protein intake protocol (CP in range all weeks; GP deviation from prescribed = 7%). Peak torque, muscle quality scores, and appendicular lean/soft tissue mass demonstrated the main effects of time (p < 0.05) while no other main effects of time or group * time interactions were seen for any measure. In conclusion, RT improved appendicular lean/soft tissue mass, peak torque, and muscle quality, with no differential effects of graded or constant protein intake.

Details

Title
The Effects of Graded Protein Intake in Conjunction with Progressive Resistance Training on Skeletal Muscle Outcomes in Older Adults: A Preliminary Trial
Author
Michel, J Max 1 ; Lievense, Kristy K 1 ; Norton, Sam C 1 ; Costa, Juliana V 1 ; Alphin, Kathryn H 1 ; Bailey, Lydia A 1 ; Miller, Gary D 2   VIAFID ORCID Logo 

 Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC 27106, USA; [email protected] (J.M.M.); [email protected] (K.K.L.); [email protected] (S.C.N.); [email protected] (J.V.C.); [email protected] (K.H.A.); [email protected] (L.A.B.) 
 Department of Health and Exercise Science, Wake Forest University, Winston-Salem, NC 27106, USA; [email protected] (J.M.M.); [email protected] (K.K.L.); [email protected] (S.C.N.); [email protected] (J.V.C.); [email protected] (K.H.A.); [email protected] (L.A.B.); Translational Science Center, Wake Forest University, Winston-Salem, NC 27106, USA 
First page
2739
Publication year
2022
Publication date
2022
Publisher
MDPI AG
e-ISSN
20726643
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2686085779
Copyright
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.