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Detraining and tapering effects on hormonal responses and strength performance
Mikel Izquierdo1, Javier Ibañez, Juan José González-Badillo
1Studies, Research and Sport Medicine Center, Government of Navarra, Navarra, Spain. mikel.izquierdo@ceimd.org
Journal of Strength and Conditioning Research
|August 10, 2007
Summary
Complete training cessation (DTR) significantly decreased strength and power in athletes. A tapering period (TAP) further increased strength but not power, with hormonal changes influencing these outcomes.
Area of Science:
- Exercise Physiology
- Sports Science
- Endocrinology
Background:
- Periodized heavy resistance training (PRT) is effective for strength and power enhancement.
- Understanding post-training recovery strategies is crucial for athletes.
- Hormonal responses to detraining and tapering are not fully elucidated.
Purpose of the Study:
- To investigate the effects of 4 weeks of complete training cessation (DTR) versus a tapering period (TAP) after 16 weeks of PRT.
- To analyze changes in maximal strength and muscle power.
- To examine underlying physiological changes in basal circulating anabolic/catabolic hormones.
Main Methods:
- Forty-six physically active men were assigned to DTR, TAP, or a control group after a 16-week PRT program.
- Maximal strength and muscle power were tested.
- Basal serum hormone concentrations (IGF-1, IGFBP-3) were measured at baseline, post-training, and post-intervention.
Main Results:
- DTR led to significant decreases in maximal strength (-6 to -9%) and muscle power output (-14 to -17%).
- TAP resulted in further increases in maximal strength (2%) but no changes in muscle power.
- DTR showed a trend towards elevated IGF-1, while TAP showed elevated IGFBP-3.
Conclusions:
- Short-term DTR may cause greater declines in muscle power than maximal strength.
- Short-term TAP can enhance maximal strength without affecting muscle power.
- Hormonal changes in IGF-1 and IGFBP-3 may partially mediate these training adaptations.
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