Influence of Resistance Training Exercise Order on Acute Thyroid Hormone Responses
José Maria P DA Silva1, Gabriel Costa E Silva2,3,4, Rodrigo R DA Conceição5
1Physical Education Postgraduate Program, Federal University of Rio de Janeiro, RJ, BRAZIL.
International Journal of Exercise Science
|August 22, 2022
Summary
The order of resistance exercises impacts thyroid hormone levels. Performing multi-joint exercises before single-joint exercises altered thyroid-stimulating hormone (TSH), T3, and T4 responses differently than the reverse order.
Area of Science:
- Endocrinology
- Exercise Physiology
- Sports Science
Background:
- Thyroid hormones play a crucial role in regulating metabolism.
- Resistance exercise (RT) elicits acute hormonal responses, including thyroid hormones.
- The specific order of RT exercises may influence these hormonal adaptations.
Purpose of the Study:
- To investigate the acute effects of different resistance exercise orders on thyroid hormone responses.
- To compare the impact of multi-joint to single-joint (MJ-SJ) versus single-joint to multi-joint (SJ-MJ) exercise sequencing.
Main Methods:
- Eight healthy men were divided into two groups: MJ-SJ and SJ-MJ.
- Participants completed 3 sets of 10 repetitions with specific rest intervals.
- Blood samples were collected pre-exercise and at 0, 15, 30, 60, and 120 minutes post-exercise.
Main Results:
- Thyroid-stimulating hormone (TSH) showed differences between groups within 15 minutes post-exercise (MJ-SJ < SJ-MJ).
- 3,5,3'-triiodothyronine (T3) levels differed at 30 minutes (MJ-SJ > SJ-MJ) and 120 minutes (MJ-SJ < SJ-MJ).
- 3,5,3',5'-tetraiodothyronine (T4) levels differed within 15 minutes post-exercise (MJ-SJ > SJ-MJ).
Conclusions:
- The order of resistance exercises significantly alters acute TSH, T3, and T4 responses.
- Exercise sequencing should be tailored based on individual training goals and desired hormonal outcomes.
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