Resistive exercise blunts LPS-stimulated TNF-alpha and Il-1 beta

Area of Science:

• Exercise physiology
• Immunology
• Endocrinology

Background:

• Cytokine profiles are crucial for immune function and can be influenced by aging and hormonal changes.
• Postmenopausal women experience hormonal shifts that may impact inflammatory responses.
• Understanding exercise effects on cytokines is vital for health interventions.

Purpose of the Study:

• To investigate the impact of acute resistive exercise on cytokine profiles (IL-6, IL-1 beta, TNF-alpha) in postmenopausal women.
• To determine if hormone replacement therapy (HRT) or selective estrogen receptor modulators (SERMs) influence exercise-induced cytokine changes.
• To assess the interaction between exercise, hormone status, and diurnal variations in cytokine production.

Main Methods:

• 35 postmenopausal women were divided into four groups: no hormone replacement (NHR), HRT, SERM, and a resting control (CON).
• Participants underwent a moderate-to-high intensity resistive exercise bout (3 sets, 10 exercises, 80% 1RM) or rested.
• Blood samples were collected pre-exercise, immediately post-exercise, and 2 hours post-exercise. Serum and LPS-stimulated blood were analyzed for IL-6, IL-1 beta, and TNF-alpha via ELISA.

Main Results:

• Resistive exercise significantly increased circulating IL-6 post-exercise.
• Exercise elevated LPS-stimulated IL-6 and IL-1 beta levels immediately post-exercise.
• Compared to controls, exercise blunted the LPS-stimulated production of IL-1 beta and TNF-alpha per monocyte post-exercise and at 2 hours, indicating a reduced diurnal response.

Conclusions:

• Acute resistive exercise increases IL-6 in postmenopausal women.
• Exercise reversed the typical diurnal increase in LPS-stimulated IL-1 beta and TNF-alpha production.
• Hormone replacement therapy and SERMs did not significantly influence these acute exercise-induced changes in cytokine profiles.