Men, Women, & Exercise: Metabolism Differs at Starting Line

TOPLINE:
When starting a regular exercise program, the skeletal muscle of sedentary men and women with overweight and obesity differs in burning sugar and fatty acids, but regular training can lessen these differences and promote similar positive metabolic changes in both biological sexes.
METHODOLOGY:
By stimulating skeletal muscle, exercise can help prevent muscle loss associated with weight loss and improve insulin sensitivity and glucose control in type 2 diabetes, but biological sex-based differences have been reported for many measures.
This study of sedentary men and women evaluated the molecular differences in skeletal muscle in response to a training program.
Researchers collected muscle biopsies from 16 women and nine men with overweight or obesity (average age, 30 years) at three time points — baseline, after the first exercise session, and after the last session at the end of training.
Training involved 1 hour of moderate to intense endurance exercise under supervision (30 minutes cycling on an ergometer and 30 minutes walking on a treadmill) thrice a week for 8 weeks.
The biopsies were profiled for patterns of three sets of omics data — DNA methylation for insight into genes switched on and off (epigenomics), RNA molecules transcribed from genes (transcriptomics), and proteins (proteomics).
TAKEAWAY:
At baseline, sex-specific differences were observed most tellingly in 120 proteins and also in DNA methylation sites of 16,012 genes and in 1366 RNA transcripts.
Men displayed a higher abundance of glycolysis-related proteins and other fast-twitch fiber–type proteins, which are involved in the processing of glucose, while women showed more proteins responsible for regulating fatty acid metabolism.
The response to the first exercise session differed between men and women, with the cellular stress response upregulated predominantly in men.
The 8-week exercise training mitigated these sex-specific differences in the skeletal muscle, leading to an upregulation of mitochondrial proteins responsible for substrate oxidation and ATP generation in both men and women.
IN PRACTICE:
“This is important because the increased capacity after exercise to use glucose and lipids for energy production is generally regarded as key to prevent type 2 diabetes,” said the study leader Professor Cora Weigert from the University of Tübingen, Tübingen, Germany, in a news release from the meeting organizers. “While initial response of skeletal muscles to exercise differs between females and males, repeated exercise appears to cancel out these differences and trigger beneficial metabolic changes in both sexes,” she added.
SOURCE:
The study was led by Simon I. Dreher, PhD, Institute for Clinical Chemistry and Pathobiochemistry, Department for Diagnostic Laboratory Medicine, Tübingen, Germany. It was published on August 15, 2024, as an early release from the annual meeting of the European Association for the Study of Diabetes 2024, Madrid, September 9-13.
LIMITATIONS:
This abstract did not discuss any limitations. 
DISCLOSURES:
The authors did not disclose any funding information. The authors declared no relevant conflicts of interest.
This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.
 
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