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Updated: Apr 28, 2026

Measuring Skeletal Muscle Thermogenesis in Mice and Rats
Published on: July 27, 2022
Hypermetabolism of skeletal muscles following sexual activity: a normal variation
Byung Wook Choi1, Sung Hoon Kim1, Hae Won Kim1
1Department of Nuclear Medicine, Keimyung University, School of Medicine, No. 194 Dongsan-Dong, Jung-Gu Daegu, Korea.
Abstract:
A 46-year-old man with early gastric cancer at the gastric antrum underwent an F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET)-computer tomography (CT) scan for staging. No definite abnormal FDG uptake of the stomach was shown. Incidentally, variable FDG uptake at the bilateral serratus muscles, abdominal muscles and muscles of both thighs (Fig. 1) was observed. He had no significant past medical history except recently diagnosed stomach cancer. On personal interview, he described having had sexual activity the night before the F-18 FDG PET/CT scan, although he was aware of needing to avoid physical activity before a PET scan. The F-18 FDG PET/CT scan was done at 2:00 p.m. Therefore, the hypermetabolism of individual skeletal muscles following sexual activity lasted over 12 h. This case illustrates the hypermetabolism of skeletal muscles following sexual activity as a normal variation.
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