Key result
A 6-second maximal voluntary isometric conditioning contraction significantly increased maximal voluntary concentric torque at a fast angular velocity of 180°/s (p=0.003), but not at a slow velocity of 30°/s.
Why the study?
Does a 6-second maximal voluntary isometric conditioning contraction improve maximal voluntary concentric torque at fast angular velocities in healthy male participants?
Does a 6-second maximal voluntary isometric conditioning contraction improve maximal voluntary concentric torque at fast angular velocities in healthy male participants?
Absolute Event Rate: 100.7% vs 94.6%
p-value: p=0.003
A 6-second maximal voluntary isometric conditioning contraction potentiates maximal voluntary concentric torque specifically at high joint angular velocities.
May enhance fast-velocity concentric torque post-conditioning in healthy adults; leaves open relevance for performance or rehab.
Not only twitch torque but also the maximal voluntary concentric torque increases after a high-intensity contraction (conditioning contraction). The purpose of this study was to test the hypothesis that the increase in the maximal voluntary concentric torque induced by a conditioning contraction is prominent when tested at fast angular velocities conditions. Twelve healthy male participants performed the maximal voluntary isometric plantar flexion for six seconds as a conditioning contraction. Before and after the conditioning contraction, peak torques during the maximal voluntary concentric plantar flexions were measured at 30°/s (slow) and 180°/s (fast), each of which was carried out in a separate condition. Isometric twitch torque was also recorded before and after the conditioning contraction in each of the two velocity conditions to confirm the extent of the positive effect of the conditioning contraction. The extent of increase in isometric twitch torque was similar between the two velocity conditions, whereas the maximal voluntary concentric torque increased significantly only in the fast velocity condition (p = 0.003). These results support the hypothesis and indicate that the maximal voluntary concentric torque can be potentiated by the conditioning contraction if the joint angular velocity during the maximal voluntary concentric contraction is sufficiently high.
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Fukutani et al. (2013) studied Healthy (n=12). Isometric conditioning contraction vs. Pre-conditioning baseline was evaluated on Maximal voluntary concentric torque at 180°/s (Nm) (p=0.003). A 6-second maximal voluntary isometric conditioning contraction significantly increased maximal voluntary concentric torque at a fast angular velocity of 180°/s (p=0.003), but not at a slow velocity of 30°/s.
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