Initial Dietary Protein Intake Influence Muscle Function Adaptations in Older Men and Women Following High-Intensity Interval Training Combined with Citrulline

This study evaluates whether the initial amount of dietary protein intake could influence the combined effect of high-intensity interval training (HIIT) and citrulline (CIT), or HIIT alone, on body composition, muscle strength, and functional capacities in obese older adults. Seventy-three sedentary...

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Bibliographic Details
Published in:	Nutrients 2019-07, Vol.11 (7), p.1685
Main Authors:	Buckinx, Fanny, Marcangeli, Vincent, Pinheiro Carvalho, Lívia, Dulac, Maude, Hajj Boutros, Guy, Gouspillou, Gilles, Gaudreau, Pierrette, Morais, José, Noirez, Philippe, Aubertin-Leheudre, Mylène
Format:	Article
Language:	eng
Subjects:	Adaptation, Physiological Adaptations Aged Aging Body composition Body composition (biology) Body fat Body mass Citrulline Citrulline - administration & dosage Citrulline - pharmacology Clinical trials Diet Dietary intake Dietary Proteins Dietary Proteins - administration & dosage Dietary Proteins - pharmacology Dietary supplements Dosage Double-Blind Method Endurance Exercise Female Fitness training programs Food and Nutrition Food Science functional capacities Gender differences Geriatrics Geriatry and gerontology Grip strength Growth hormones Gériatrie Health care High-Intensity Interval Training HIIT Human health and pathology Human health sciences Humanities and Social Sciences Humans Interval training Intervention Lean body mass Life Sciences Male Men Middle Aged Muscle function Muscle Strength Muscle Strength - drug effects Muscle, Skeletal Muscle, Skeletal - chemistry Muscle, Skeletal - drug effects Nutrition and Dietetics Older people Physical fitness protein intake Protein synthesis Proteins Sciences de la santé humaine Sport Sport physiology Supplementation Women Womens health
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Summary:	This study evaluates whether the initial amount of dietary protein intake could influence the combined effect of high-intensity interval training (HIIT) and citrulline (CIT), or HIIT alone, on body composition, muscle strength, and functional capacities in obese older adults. Seventy-three sedentary obese older men and women who completed a 12-week elliptical HIIT program with double-blinded randomized supplementation of CIT or placebo (PLA) were divided into four groups according to their initial protein intake (CIT-PROT+: = 21; CIT-PROT-: = 19; PLA-PROT+: = 19; PLA-PROT-: = 14). Body composition (fat and fat-free masses), handgrip (HSr) strength, knee extensor (KESr) strength, muscle power, and functional capacities were measured pre-intervention and post-intervention. Following the intervention, the four groups improved significantly regarding all the parameters measured. For the same initial amount of protein intake, the CIT-PROT- group decreased more gynoid fat mass ( = 0.04) than the PLA-PROT- group. The CIT-PROT+ group increased more KESr ( = 0.04) than the PLA-PROT+ group. In addition, the CIT-PROT- group decreased more gynoid FM ( = 0.02) and improved more leg FFM ( = 0.02) and HSr ( = 0.02) than the CIT-PROT+ group. HIIT combined with CIT induced greater positive changes than in the PLA groups. The combination seems more beneficial in participants consuming less than 1 g/kg/d of protein, since greater improvements on body composition and muscle strength were observed.
ISSN:	2072-6643 2072-6643