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Abstract Skeletal muscle undergoes rapid and dynamic changes in energy demand during exercise, limiting the physiological relevance of resting-state measurements. Here, we demonstrate the feasibility of combining hyperpolarised ¹³C magnetic resonance spectroscopy (¹³C-MRS) with ³¹P-MRS to non-invasively measure real-time metabolic responses in exercising human skeletal muscle. Sedentary and endurance-trained men perform plantar-flexion exercise inside a magnetic resonance scanner.
Introduction Endogenous and exogenous carbohydrate (CHO) provides an important substrate for energy production during prolonged moderate- to high-intensity (endurance) exercise (Bergström et al., 1967; Romijn et al., 1993; van Loon et al., 2001). Despite this, the endogenous storage pool of CHO within the liver and skeletal muscle are relatively limited (Gonzalez et al., 2016).
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