Lower-Body Strength and Hypertrophy Adaptations in Response to Concurrent Training in Trained Young Males
Study Details
This randomised 11-week study compared endurance, resistance and concurrent training in 30 trained young men, examining lower-body strength, explosive performance and muscle morphology 🔍
Training comprised 5 weeks emphasising maximal strength, followed by 6 weeks targeting explosive strength 📆
Key Findings
💪 Maximal voluntary isometric contraction increased only with resistance training (+18.4%), suggesting concurrent training may limit maximal-strength development
⚡ Peak rate of force development improved with resistance (+31.8%) and concurrent training (+23.1%)
⏱️ Resistance training produced progressive improvements across both phases, whereas concurrent training improved mainly during the second
🚀 Early-phase force development (0–50 ms) improved earlier with resistance training, while the concurrent group improved only from mid- to post-training (+38.3%), alongside greater quadriceps activation
🆙 Countermovement-jump positive impulse increased with resistance (+12.7%) and concurrent training (+8.8%), with no evidence of interference
📈 Vastus lateralis cross-sectional area increased with resistance (+17.0%) and concurrent training (+8.8%)
🧬 Muscle pennation angle also increased in both groups: +18.6% with resistance and +10.1% with concurrent training
↔️ Endurance training alone produced no improvements in rate of force development
⚠️ The study was small, included only trained young men and lasted 11 weeks
Conclusion
For trained athletes, concurrent endurance and resistance training may constrain maximal isometric strength and delay rapid-force adaptations, but well-periodised resistance training can still produce meaningful hypertrophy and explosive-performance gains alongside endurance work ✅
Reference
https://pubmed.ncbi.nlm.nih.gov/42926218/
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