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Functional maximal strength training induces neural transfer to single-joint tasks.
Marius S Fimland1, Jan Helgerud, Markus Gruber
1Department of Circulation and Imaging, Norwegian University of Science and Technology, Trondheim 7489, Norway. marius.fimland@ntnu.no
European Journal of Applied Physiology
|June 9, 2009
Summary
Maximal strength training (MST) using the leg press induced neural adaptations in plantar flexor muscles during single-joint contractions. This training enhanced muscle strength and neural drive, demonstrating cross-transfer effects in lower limb muscles.
Area of Science:
- Exercise Physiology
- Neuroscience
- Biomechanics
Background:
- Neuromuscular adaptations are crucial for strength gains.
- Understanding cross-transfer effects from multi-joint to single-joint movements is important for training specificity.
Purpose of the Study:
- To determine if functional multiple-joint leg press training induces neural adaptations in single-joint plantar flexor tasks.
- To investigate neural changes in soleus and gastrocnemius medialis muscles.
Main Methods:
- Maximal strength training (MST) group (n=10) underwent 8 weeks of leg press training.
- Control group (n=9) did not train.
- Neural adaptations assessed via electromyography (EMG), V-waves, and H-reflexes during maximal voluntary isometric contractions (MVIC).
Main Results:
- Leg press one-repetition maximum increased by 44%.
- Plantar flexion MVIC increased by 20%, with soleus EMG increasing by 13%.
- Soleus and gastrocnemius medialis V/M ratios increased significantly, indicating enhanced neural activation.
Conclusions:
- Leg press MST effectively induces neural adaptations in single-joint plantar flexion.
- These findings suggest a potential for cross-transfer of neural adaptations from compound exercises to isolated movements.
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