Related Experiment Videos
Plasma catecholamine responses and neural adaptation during short-term resistance training
T Pullinen1, P Huttunen, P V Komi
1Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväkylä, Finland. tpulline@pallo.jyu.fi
European Journal of Applied Physiology
|July 6, 2000
Summary
Resistance training improves muscle strength and neural adaptation, but does not reduce exercise-induced adrenaline responses. Higher strength gains correlated with increased adrenaline levels in some individuals. This study investigated the relationship between strength adaptation and hormonal responses during training.
Area of Science:
- Exercise Physiology
- Endocrinology
- Sports Science
Background:
- Resistance-trained individuals often exhibit blunted plasma adrenaline responses to exercise.
- The interplay between strength gains, neural adaptations, and hormonal responses remains unclear.
Purpose of the Study:
- To investigate the relationship between strength adaptation and plasma adrenaline response during short-term resistance training.
- To determine if neural adaptations influence the exercise-induced adrenaline response.
Main Methods:
- Eight healthy men performed 5 resistance exercises (leg extensions) over a training period.
- Measurements included electromyography (EMG) for muscle activation, maximal voluntary contraction (MVC), and plasma adrenaline/noradrenaline levels.
- Oxygen consumption (VO2tot) and blood lactate were also assessed.
Main Results:
- Significant increases in 1-RM, MVC, and EMG amplitude indicated strength and neural gains.
- Muscle contraction efficiency improved, with lower aEMG:load and VO2tot:load ratios in later exercises.
- Post-exercise plasma adrenaline and noradrenaline levels did not differ significantly between early and late training sessions, despite increased noradrenaline.
- Adrenaline response significantly decreased after the second exercise and did not correlate with strength or neural adaptations.
Conclusions:
- The attenuation of plasma adrenaline response during resistance training is not explained by strength or neural adaptations.
- Individual differences in strength gain may influence post-exercise adrenaline levels, with higher gains potentially linked to increased adrenaline.