european college of sport science

OP-PH06 Physiology 6
the 40% ECC bouts several times increases the protective effect. This study tested the hypothesis that 4 bouts of 40% ECC performed every
2 weeks would confer similar protective effect to one bout of maximal ECC against subsequent bout of maximal ECC.
Methods: Thirty untrained men (22.2 ± 2.0 y) were placed into two groups (n=15 per group); 4 x 40% (40%) and control (CON) groups by
matching the pre-exercise MVC. The 40% group performed 4 bouts of 40% ECC consisting of 30 lengthening contractions of the nondominant
elbow flexors every 2 weeks and 30 maximal lengthening contractions of the same muscle (100% ECC) 2 weeks after the last
40% ECC. The CON group performed two bouts of 100% ECC with the non-dominant arm separated by two weeks. MVC at 6 angles,
optimum angle (OA), concentric isokinetic strength (30 and 300º/s), range of motion (ROM), upper arm circumference (CIR), plasma
creatine kinase activity (CK) and myoglobin concentration (Mb), muscle soreness (SOR), and echo-intensity (EI) of B-mode ultrasound
images were taken before, immediately after, and for 5 days following each ECC. Changes in the measures after 100% ECC were compared
between the groups by a two-way repeated measures ANOVA. Changes in the measures after 40% ECC were also compared
amongst 4 bouts.
Results: No significant differences in the changes in any measures were evident between the 100% bout of the 40% group and the second
100% bout of the CON group. For the 40% group, changes in all measures except for OA and CIR following the second to fourth bouts
were significantly (P