Resistance exercise and plasma beta-endorphin/beta-lipotrophin immunoreactivity

Area of Science:

• Exercise Physiology
• Endocrinology
• Sports Science

Background:

• Endurance exercise is known to elicit hormonal responses.
• The effects of resistance exercise on certain hormones are less understood.
• Beta-endorphin/beta-lipotrophin hormone (LPH) plays a role in stress and pain modulation.

Purpose of the Study:

• To compare the effects of endurance and resistance exercise on hormonal levels.
• To investigate if burst activity resistance exercise induces similar hormonal changes as endurance exercise.
• To measure serum cortisol and plasma beta-endorphin/beta-LPH immunoreactivity in response to different exercise types.

Main Methods:

• Five male participants underwent both treadmill running (endurance) and weight lifting (resistance) exercise.
• Blood samples were collected before and after each exercise bout.
• Serum cortisol and plasma beta-endorphin/beta-LPH immunoreactivity were quantified.

Main Results:

• Both treadmill testing and weight training led to a significant increase in mean beta-endorphin/beta-LPH immunoactivity.
• The hormonal increases observed post-exercise were similar for both endurance and resistance activities.
• Serum cortisol levels were also measured, though the abstract focuses on beta-endorphin/beta-LPH.

Conclusions:

• Hormonal changes, specifically increased beta-endorphin/beta-LPH, occur with both endurance and burst activity resistance exercise.
• The magnitude of these hormonal responses appears comparable between the two exercise modalities.
• These findings suggest that resistance exercise can elicit similar neuroendocrine adaptations as endurance exercise.