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Acute endocrine responses to different strength exercise order in men
Rodrigo Rodrigues da Conceição1, Roberto Simão2, Anderson Luiz B Silveira1
1Department of Physiological Sciences and, Department of Physical Education and Sports, Federal Rural University of Rio de Janeiro - UFRRJ - Rio de Janeiro, RJ, Brazil.
Journal of Human Kinetics
|February 26, 2015
Summary
Resistance training acutely alters testosterone and cortisol levels. However, the order of exercising muscle groups, whether large to small or small to large, does not significantly impact these hormonal changes.
Area of Science:
- Exercise Physiology
- Endocrinology
- Sports Science
Background:
- Resistance training (RT) is known to elicit acute hormonal responses, including changes in testosterone and cortisol.
- The specific exercise order, particularly the sequence of targeting muscle groups (e.g., large to small vs. small to large), may influence these hormonal adaptations.
- Understanding the impact of exercise order on hormonal profiles is crucial for optimizing training protocols.
Purpose of the Study:
- To investigate whether the order of exercising muscle groups affects acute changes in total testosterone, free testosterone, and cortisol during resistance training sessions.
- To compare the hormonal responses between a resistance training protocol starting with larger muscle groups to smaller ones (LG-SM) versus the reverse (SM-LG).
Main Methods:
- Eight healthy males were divided into two groups: LG-SM and SM-LG.
- Both groups performed a standardized resistance training session (3 sets of 10 repetitions with 2-minute rest periods).
- Blood samples were collected post-exercise and after 30 minutes of rest to measure hormone concentrations.
Main Results:
- Both resistance training protocols (LG-SM and SM-LG) resulted in significant acute increases in total testosterone, free testosterone, and cortisol compared to rest.
- No significant differences in the concentrations of these hormones were observed between the LG-SM and SM-LG groups.
- The acute hormonal response to resistance training was independent of the exercise order based on muscle group size.
Conclusions:
- Resistance training elicits significant acute changes in anabolic (testosterone) and catabolic (cortisol) hormones.
- The order in which muscle groups are exercised during a resistance training session does not appear to influence these acute hormonal responses.
- These findings suggest that training program design regarding exercise order may not need to prioritize hormonal response optimization.
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