Leucine Supplementation Strategies to Enhance Muscle Anabolic Responses in Older Age

Inclusion Criteria: * Male, 65-75 years of age * BMI 18-28 kg/m2 * Non smoker * Not performing regular resistance type exercise * Participant is willing and able to give informed consent for participation in the study Exclusion Criteria: * A BMI \<18 or \>28 kg·m-2 * Active cardiovascular disease: uncontrolled hypertension (BP \> 160/100), angina, heart failure (class III/IV), arrhythmia, right to left cardiac shunt or recent cardiac event * Cerebrovascular disease: previous stroke, aneurysm (large vessel or intracranial) * Respiratory disease including pulmonary hypertension or chronic obstructive pulmonary disease (COPD) * Metabolic disease: hyper and hypo parathyroidism, untreated hyper and hypothyroidism, Cushing's disease, types 1 or 2 diabetes (treated and untreated), inborn/ congenital errors of metabolism (e.g. phenylketonuria (PKU), galactosaemia) * Active inflammatory bowel disease * Acute infection * Acute or chronic renal disease * Malignancy (or history of malignancy with 5 y) * Recent steroid treatment (within 6 mo), or hormone replacement therapy * Coagulopathy * Musculoskeletal or neurological disorders * Known allergies to any of the product ingredients * Having taken part in a research study in the last 3 months involving invasive procedures or an inconvenience allowance