Leucine Supplementation Increases Muscle Strength and Volume, Reduces Inflammation, and Affects Wellbeing in Adults and Adolescents with Cerebral Palsy

Theis, Nicola ORCID: 0000-0002-0775-1355, Brown, Meghan A ORCID: 0000-0003-3260-977X, Wood, Paula and Waldron, Mark (2020) Leucine Supplementation Increases Muscle Strength and Volume, Reduces Inflammation, and Affects Wellbeing in Adults and Adolescents with Cerebral Palsy. Journal of Nutrition. ISSN 0022-3166 (In Press)

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Abstract

BACKGROUND: Spastic cerebral palsy (CP) is characterized by muscle weakness owing, in part, to a blunted muscle protein synthetic response. This might be normalized by long-term leucine supplementation. OBJECTIVES: The study assessed the effects of 10 wk leucine supplementation in adolescents and adults with CP. METHODS: The study was a single-center randomized controlled trial. Twenty-four participants were randomly assigned to a control group (n = 12) or a leucine group (n = 12). l-Leucine (192 mg/kg body mass) was dissolved in water and administered daily for 10 wk. The primary outcome measures of elbow flexor muscle strength and muscle volume (measured by 3D ultrasound technique) and inflammation [C-reactive protein (CRP) concentration] were assessed before and after the 10 wk, alongside the secondary outcomes of body composition (measured by CP-specific skinfold assessment), metabolic rate (measured by indirect calorimetry), and wellbeing (measured by a self-reported daily questionnaire). Data were compared via a series of 2-factor mixed ANOVAs. RESULTS: Twenty-one participants completed the intervention (control group: n = 11, mean ± SD age: 18.3 ± 2.8 y, body mass: 48.8 ± 11.9 kg, 45% male; leucine group: n = 10, age: 18.6 ± 1.7 y, body mass: 58.3 ± 20.2 kg, 70% male). After 10 wk, there was a 25.4% increase in strength (P = 0.019) and a 3.6% increase in muscle volume (P = 0.001) in the leucine group, with no changes in the control group. This was accompanied by a 59.1% reduction in CRP (P = 0.045) and improved perceptions of wellbeing (P = 0.006) in the leucine group. No changes in metabolism or body composition were observed in either group (P > 0.05). CONCLUSIONS: Improvements in muscle strength and volume with leucine supplementation might provide important functional changes for adults and adolescents with CP and could be partly explained by reduced inflammation. The improved wellbeing highlights its capacity to improve the quality of daily living. This trial was registered at clinicaltrials.gov as NCT03668548.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Muscle; Cerebral palsy; Leucine; Inflammation; Wellbeing
Subjects: R Medicine > R Medicine (General)
R Medicine > RJ Pediatrics > RJ125 Physiology of children and adolescents
R Medicine > RJ Pediatrics > RJ370 Diseases of children and adolescents
Divisions: Schools and Research Institutes > School of Sport and Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Marta Kemp
Date Deposited: 29 Jan 2020 12:43
Last Modified: 17 Feb 2020 13:15
URI: http://eprints.glos.ac.uk/id/eprint/8085

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