Original Article EFFECT OF CYCLING EXERCISE AT DIFFERENT PEDAL CADENCES ON SUBSEQUENT MUSCLE STRENGTH

The main purpose of this study was to compare the effects of previous high-intensity aerobic exercise at 50 and 100 rev min−1 on subsequent strength determined through maximal repetitions (RM) and counter-movement jump (CMJ). Thirteen physically active males (age, 23.0 ± 3.7 years; weight, 77.1 ± 8.8 kg; height, 179.3 ± 4.0 cm; %body fat, 14.3 ± 2.9%) performed the following procedures on different days: (1) incremen-tal test on cycle ergometer to determine the onset of blood lactate accumulation at 50 and 100 rev min−1; (2) three sets of RMs with the load corresponding to 10 RM in leg press 45 ° (LC); (3) three sets of 10 maximal CMJ in contact plate (JC); (4) four trials of 30 minutes at the onset of blood lactate accumulation obtained at 50 and 100 rev min−1, followed by three sets of RMs with 10 RM load (L50 and L100, respectively) or three sets of maximal CMJ (J50 and J100, respectively). Strength was compromised at 100 rev min−1 (L100 = 22.6 ± 6.0 vs. LC = 30.4 ± 1.5 repetitions) in leg press, while CMJ height was reduced at 50 rev min−1 (J50 = 29.2 ± 3.0 vs. JC = 31.7 ± 2.9 cm). The reduction in number of repetitions at L100 (26%) was signifi-cantly higher than CMJ height at J50 (8%). In conclusion, the extent of strength loss after high-intensity aero-bic exercise can be dependent on both pedal cadence and strength test conditions. When aerobic cycling exercise precedes strength training, it may be beneficial to use low pedal cadences to minimize strength loss. [J Exerc Sci Fit • Vol 9 • No 2 • 93–99 • 2011