Endogenous Opioid Peptides After Floatation Therapy in Resistance-Trained Men.

Area of Science:

• Exercise Physiology
• Neuroendocrinology
• Rehabilitation Science

Background:

• Floatation-restricted environmental stimulation therapy (Float-REST) is known to alleviate muscle soreness and fatigue.
• The physiological mechanisms, particularly the role of endogenous opioid peptides, underlying Float-REST's benefits remain incompletely understood.

Purpose of the Study:

• To investigate the influence of Float-REST on the release of beta-endorphin (β-End) and proenkephalin (ProEnk) following acute, high-intensity resistance exercise in trained men.

Main Methods:

• A within-subject, cross-over design was employed with 11 resistance-trained men.
• Participants underwent high-intensity resistance exercise (6x10 back squats at 80% 1RM) followed by either a 1-hour float session or a passive control recovery.
• Blood samples were collected pre-exercise, immediately post-exercise, and at 1, 24, and 48 hours post-recovery for ELISA analysis of β-End and ProEnk.

Main Results:

• Plasma β-End significantly increased post-resistance exercise in both float and control conditions, with no significant differential changes between treatments.
• Proenkephalin (ProEnk) concentrations remained stable and did not show significant changes in response to exercise or float therapy.
• The findings indicate that Float-REST does not significantly modulate these specific opioid peptides in the context of acute resistance exercise.

Conclusions:

• The observed lack of differential changes in β-End and ProEnk suggests that these opioid peptides may not be the primary mediators of the deep relaxation reported after Float-REST in resistance-trained men.
• Resistance exercise consistently elevates β-End, irrespective of subsequent float therapy.
• The stable, non-responsive ProEnk levels hint at potential paracrine signaling mechanisms within the circulation.