Abstract
PURPOSE: One bout of 5-6 s of maximal voluntary isometric contraction (MVC) is known to enhance subsequent dynamic joint performance such as dynamic joint torque and power with maximal voluntary effort. On the other hand, such a muscle contraction can also induce muscle fatigue. It is then possible that individual differences in fatigue resistance is a factor that affects the balance between potentiation and fatigue. Here, we examined the effect of chronic heavy-resistance training on the extent and time course of the potentiation of maximal voluntary dynamic torque. METHODS: Before and after a 12-wk intervention, maximal voluntary concentric knee extension torque at 210 ·s was measured in the following sequence: before and immediately after a 5-s MVC of knee extension and 1, 3, and 5 min thereafter. The training group performed heavy-resistance training exercise of knee extension consisting of five sets of eight repetitions with 80% of one-repetition maximum, three sessions a week during the intervention period. RESULTS: Before the resistance training intervention, maximal voluntary concentric torque was significantly enhanced only at 1 and 3 min post-MVC. After the 12-wk resistance training, the maximal voluntary concentric torque was potentiated also immediately after the conditioning MVC and was further increased at 1-min point. CONCLUSION: These findings indicate that the contraction-induced potentiation of maximal voluntary dynamic torque is pronounced in strength-trained individuals.
Original language | English |
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Pages (from-to) | 1323-1330 |
Number of pages | 8 |
Journal | Medicine and Science in Sports and Exercise |
Volume | 45 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2013 Jul |
Keywords
- Postactivation potentiation
- maximal voluntary concentric torque
- muscle fatigue
- quadriceps femoris
- twitch contraction
- warm-up
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation