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Related Experiment Videos

Muscular adaptation to concentric and eccentric exercise at equal power levels

T P Mayhew1, J M Rothstein, S D Finucane

  • 1Department of Physical Therapy, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-0224, USA.

Medicine and Science in Sports and Exercise
|June 1, 1995
PubMed
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Concentric contractions led to greater muscle hypertrophy and improved maximal isometric torque (MIso) compared to eccentric contractions. This study highlights the benefits of concentric training for strength and muscle growth.

Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Sports Science

Background:

  • Muscle contractions are broadly categorized as concentric (shortening) and eccentric (lengthening).
  • Both contraction types are utilized in resistance training, but their differential effects on muscle adaptation require further elucidation.
  • Understanding these differences is crucial for optimizing training protocols for hypertrophy and strength gains.

Purpose of the Study:

  • To compare the effects of concentric versus eccentric training on quadriceps femoris muscle fiber hypertrophy.
  • To investigate the impact of concentric versus eccentric training on maximal isometric torque (MIso) production.
  • To determine if training at the same relative power level yields different adaptations between contraction types.

Main Methods:

Related Experiment Videos

  • Twenty healthy subjects were divided into concentric and eccentric training groups.
  • Both groups trained three times per week for 4 weeks using a Kin-Com dynamometer at 90% maximal concentric power and 60°/s.
  • Muscle biopsies (vastus lateralis) and maximal isometric knee extension torque were assessed pre- and post-training.

Main Results:

  • A significant difference was observed in Type II fiber areas between the groups (P < 0.01).
  • Maximal isometric torque (MIso) also showed a significant difference between the concentric and eccentric training groups (P = 0.01).
  • Concentric training resulted in greater increases in both Type II fiber area and MIso compared to eccentric training.

Conclusions:

  • Concentric contractions, when performed at the same relative power level, induce greater muscle hypertrophy than eccentric contractions.
  • Concentric training leads to superior improvements in maximal isometric torque production compared to eccentric training.
  • These findings suggest that concentric-focused training may be more effective for maximizing muscle size and strength adaptations.