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Amy Fleischman, Hideo Makimura, Takara L. Stanley, Meaghan A. McCarthy, Matthew Kron, Noelle Sun, Sarah Chuzi, Mirko I. Hrovat, David M. Systrom, Steven K. Grinspoon, Skeletal Muscle Phosphocreatine Recovery after Submaximal Exercise in Children and Young and Middle-Aged Adults, The Journal of Clinical Endocrinology & Metabolism, Volume 95, Issue 9, 1 September 2010, Pages E69–E74, https://doi.org/10.1210/jc.2010-0527
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Context: Elderly subjects have reduced mitochondrial function. However, it remains unclear whether the decline in mitochondrial function begins earlier in the life span.
Objective: The objective of the study was to determine skeletal muscle mitochondrial oxidative phosphorylation by 31phosphorous-magnetic resonance spectroscopy (MRS) across a variety of age groups.
Design: This was a cross-sectional study of 121 healthy normal-weight and overweight individuals from age 8 to 55 yr.
Setting: The study was conducted at a single university medical center in Boston, MA.
Participants: Participants included 68 children and 53 adults from the Boston community.
Interventions and Main Outcome Measures: Phosphocreatine (PCr) recovery was evaluated by 31phosphorous-MRS after submaximal exercise. Subjects were also evaluated with anthropometric measurements, metabolic profiles, and measures of physical activity.
Results: PCr recovery determined by 31phosphorous-MRS is positively associated with age in univariate analysis in a cohort of individuals aged 8–55 yr (r = +0.55, P < 0.0001). Stratification of subjects into four age groups (prepubertal and early pubertal children, pubertal and postpubertal children < 18 yr, young adults aged 18–39 yr, and middle aged adults aged 40–55 yr) demonstrates prolongation of PCr recovery with increasing age across the four groups (P < 0.0001 by ANOVA). The relationship between PCr recovery and age remains strong when controlling for gender; race; ethnicity; body mass index; measures of physical activity and inactivity; and anthropometric, nutritional, and metabolic parameters (P < 0.004).
Conclusions: Skeletal muscle PCr recovery measured by 31phosphorous-MRS is prolonged with age, even in children and young adults.