This is comparable to previous results where the investigators used a similar eccentric exercise intervention and demonstrated an increase in soluble IL-6 receptor but did not KPT-330 order observe any changes in IL-6 or C-reactive protein [13]. However, the current results are different from the increase in IL-6 and IL-1β 1 day after eccentric exercise of the elbow flexors [14]. The results of the current study suggest that there was no acute inflammatory reaction to eccentric knee extension and is in contrast to Chen and Hseigh who demonstrated an acute increase in IL-6 and IL-1β after one day of eccentric elbow flexion [14].
They did find that continued eccentric exercise over the next 6 days did not further exacerbate the inflammatory event, in fact, the inflammatory markers measured returned to baseline levels and did not rise with the repeated bouts of eccentric elbow flexion exercise. The results of current study combined with Chen and Hseigh [14] suggest that the inflammatory markers measured in these studies may not be substantially
exaggerated Talazoparib research buy following repeated bouts of eccentrically based exercise. The reason for the lack of an acute inflammatory response with the first bout of eccentric exercise in this study could be due to several factors. Firstly, the participants may not have been exerting maximal effort and therefore did not produce muscle damage and an initiation of the infiltration of inflammatory markers to degenerate and repair the damaged tissue. Our results indicated that the participants developed approximately 12% less force
during the eccentric contractions as compared to the isometric contractions (data not shown) which suggest that a maximal effort was not given. This is in contrast to data from Amiridis et al. [17] who demonstrated that eccentric torque O-methylated flavonoid produced at 120° × s−1 was between 8% and 14% higher than maximal isometric torque suggesting our participants were giving a sub-maximal effort. This sub-maximal effort likely would not have resulted in much muscle damage as has been previously demonstrated [18] and this could explain the lack of a systemic inflammatory event. Also, our high velocity of movement (120° × s−1) may have been too fast for the participants to react to and activate their musculature thus, negating the ability of the participants to fully contract the musculature eccentrically which in turn would have produced less fatigue and muscle damage. This certainly remains a possibility as previous research on eccentric contractions at higher velocities (180° × s−1) has demonstrated that maximal eccentric torque did not change over 3 bouts of 32 maximal voluntary contractions [19] suggesting that higher velocity movements do not develop as much muscle fatigue.