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• W2521511954 endingPage "7417" @default.
• W2521511954 startingPage "7399" @default.
• W2521511954 abstract "Resistance exercise training (RET) is one of the most effective strategies for preventing declines in skeletal muscle mass and strength with age. Hypertrophic responses to RET with age are diminished compared to younger individuals. In response to 6 weeks RET, we found blunted hypertrophic responses with age are underpinned by chronic deficits in long-term muscle protein synthesis. We show this is likely to be the result of multifactorial deficits in anabolic hormones and blunted translational efficiency and capacity. These results provide great insight into age-related exercise adaptations and provide a platform on which to devise appropriate nutritional and exercise interventions on a longer term basis.Ageing is associated with impaired hypertrophic responses to resistance exercise training (RET). Here we investigated the aetiology of 'anabolic resistance' in older humans. Twenty healthy male individuals, 10 younger (Y; 23 ± 1 years) and 10 older (O; 69 ± 3 years), performed 6 weeks unilateral RET (6 × 8 repetitions, 75% of one repetition maximum (1-RM), 3 times per week). After baseline bilateral vastus lateralis (VL) muscle biopsies, subjects consumed 150 ml D2 O (70 atom%; thereafter 50 ml week-1 ), further bilateral VL muscle biopsies were taken at 3 and 6 weeks to quantify muscle protein synthesis (MPS) via gas chromatography-pyrolysis-isotope ratio mass spectrometry. After RET, 1-RM increased in Y (+35 ± 4%) and O (+25 ± 3%; P < 0.01), while MVC increased in Y (+21 ± 5%; P < 0.01) but not O (+6 ± 3%; not significant (NS)). In comparison to Y, O displayed blunted RET-induced increases in muscle thickness (at 3 and 6 weeks, respectively, Y: +8 ± 1% and +11 ± 2%, P < 0.01; O: +2.6 ± 1% and +3.5 ± 2%, NS). While 'basal' longer term MPS was identical between Y and O (∼1.35 ± 0.1% day-1 ), MPS increased in response to RET only in Y (3 weeks, Y: 1.61 ± 0.1% day-1 ; O: 1.49 ± 0.1% day-1 ). Consistent with this, O exhibited inferior ribosomal biogenesis (RNA:DNA ratio and c-MYC induction: Y: +4 ± 2 fold change; O: +1.9 ± 1 fold change), translational efficiency (S6K1 phosphorylation, Y: +10 ± 4 fold change; O: +4 ± 2 fold change) and anabolic hormone milieu (testosterone, Y: 367 ± 19; O: 274 ± 19 ng dl-1 (all P < 0.05). Anabolic resistance is thus multifactorial." @default.
• W2521511954 created "2016-09-30" @default.
• W2521511954 creator A5010797648 @default.
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• W2521511954 creator A5085953050 @default.
• W2521511954 date "2016-11-07" @default.
• W2521511954 modified "2023-10-12" @default.
• W2521511954 title "Synchronous deficits in cumulative muscle protein synthesis and ribosomal biogenesis underlie age‐related anabolic resistance to exercise in humans" @default.
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