Exercise intensity and duration affect blood soluble HSP72

Area of Science:

• Exercise physiology
• Immunology
• Biochemistry

Background:

• Soluble heat shock protein 72 (sHSP72) is implicated as a signaling molecule in the immune response to exercise.
• Understanding how exercise parameters influence sHSP72 release is crucial for comprehending exercise-induced immune adaptations.

Purpose of the Study:

• To investigate the effect of varying endurance running durations and intensities on plasma/serum sHSP72 levels in athletes.
• To compare the sHSP72 response to different exercise protocols, including continuous runs, interval training, and marathon running.
• To determine the influence of exercise intensity versus duration on sHSP72 release.

Main Methods:

• Athletes underwent various exercise protocols: continuous run (60 min, 75% VO2max), long run (120 min, 60% VO2max), interval training (35 min, 88% VO2max), and marathon run (approx. 260 min, 65% VO2max).
• Blood samples were collected pre-exercise and at multiple time points post-exercise (0.5, 1, 3, 24 hours).
• Enzyme immunoassay was used to quantify inducible HSP72 levels in plasma/serum.

Main Results:

• All exercise types induced significant increases in sHSP72 levels immediately post-exercise, with the highest levels observed after the marathon run.
• Exhaustive exercise (80% VO2max) resulted in significantly higher sHSP72 concentrations compared to moderate exercise (60% VO2max) of identical duration.
• Longer-duration, competitive endurance exercise elicited a more pronounced sHSP72 response than shorter, more intensive exercise.

Conclusions:

• Exercise duration and intensity are key factors influencing the release of sHSP72 into circulation.
• A duration- and intensity-dependent role for sHSP72 in the exercise-induced immune response is suggested.
• sHSP72 may serve as a biomarker for the physiological stress imposed by endurance exercise.