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The effects of exercise on the median (▲) and individual subject expression (line) of transcripts for tissue inhibitor of metalloproteinase (TIMP1, A), α-cardiac actin isoform (ACTC1, B), and growth and differentiation factor-8 (GDF8, C). Post-exercise (Post-ex) expression was significantly different than pre-exercise (Pre-ex) for the young (P ≤ 0.05) but not the elderly for all 3 genes. Expression data were determined by quantitative real-time RT-PCR and normalized to 18s rRNA levels.
