Metabolic changes explain how training mitigates the reduction in strength caused by sleep restriction

Area of Science:

• Exercise Physiology
• Metabolomics
• Sleep Science

Background:

• Sleep is vital for physiological and cognitive functions, impacting athletic performance.
• Sleep restriction is common and known to impair strength and power, but metabolic links are unclear.

Purpose of the Study:

• To investigate the effects of acute sleep restriction on strength performance and metabolic profiles in trained rats.
• To identify global biochemical changes associated with sleep deprivation using untargeted metabolomics.

Main Methods:

• Trained Wistar rats were divided into Trained Control (TC) and Trained Sleep Restriction (TSR) groups.
• Maximal Strength Test (MST) was performed before and after a 6-hour sleep restriction period.
• Gas Chromatography-Mass Spectrometry (GC-MS) metabolomics analyzed blood samples for biochemical changes.

Main Results:

• The TSR group showed significantly reduced strength compared to TC by week 6 (p < 0.001), despite similar muscle glycogen.
• Metabolomic analysis revealed decreased levels of key amino acids (alanine, glutamine, serine, glycine) and increased phenylalanine and valine in the TSR group.
• Metabolic shifts indicated reduced amino acid support for the Krebs cycle and impaired neuromuscular homeostasis.

Conclusions:

• Acute sleep restriction negatively impacts strength performance in trained rats.
• Metabolic alterations, particularly decreased amino acid availability for energy pathways, underlie strength reduction.
• Glycogen availability is not the primary factor affected by sleep restriction concerning strength performance.