Small non-coding RNAs are altered by short-term sprint interval training in men

Area of Science:

• Molecular Biology
• Exercise Physiology
• Genetics

Background:

• Small non-coding RNAs (ncRNAs) play vital roles in biological processes and disease.
• Exercise training improves health but its molecular mechanisms remain unclear.
• Epigenetic factors like microRNAs are implicated, but other small ncRNAs' roles in exercise are unknown.

Purpose of the Study:

• To investigate if sprint interval training (SIT) alters circulating small ncRNAs in human blood.
• To identify specific small ncRNAs modulated by chronic exercise.
• To explore the functional implications of these ncRNA changes.

Main Methods:

• Small RNA sequencing was used on whole blood samples from ten healthy men.
• Participants underwent a 6-week SIT program (3 sessions/week).
• Changes in small ncRNA abundance were analyzed pre- and post-training, and after a single SIT session.

Main Results:

• Six weeks of SIT led to significant changes in 1266 small ncRNAs, including 13 microRNAs (q < 0.05).
• Twelve altered microRNAs were ubiquitously expressed and targeted pathways like p53, thyroid hormone, and cell cycle signaling.
• Changes in microRNA abundance were observed after chronic SIT, not after a single session.
• Younger individuals showed a greater acute SIT-induced change in miR-1301-3p compared to older individuals.

Conclusions:

• Circulating small ncRNAs are significantly modulated by chronic exercise training.
• These ncRNAs may mediate the health benefits of exercise by controlling key signaling pathways.
• Specific microRNAs, like miR-1301-3p, show differential responses based on age and training duration.