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The relationship between the level of free radicals measured by electron paramagnetic resonance spectroscopy (EPR) and the ATP cost of contraction during submaximal plantar flexion exercise [young (empty circles, female = 5; male = 3; n = 9), old (gray circles, female = 5; male = 5; n = 10), and oldest-old (black circles, female = 4; male = 5; n = 9)].
