The Effect of Two Weeks of a Decrease in Training Volume on Some Physical Factors and Catabolic and Anabolic Indicators in Male Trained Runners

The aim of this study was to determine effect of a period of 70% decrease in training on strength, power, anabolic and catabolic status of runners. 14 male runners (mean age 23.50±4.06 years, height 178.21±5.95 cm, fat percent 9.93±3.16) voluntarily participated in the study. After the first test, 8 weeks of progressive training started. The second test was conducted after eight weeks. Afterwards, a decrease in training volume phase began. Taper group passed 14 days of 70% decrease in training volume, while control group continued training with the same loading. After 14 days, the third test was carried out under the same conditions. For data analysis, analysis of variance (ANOVA) with repeated measures and Bonferroni post hoc tests were used (P<0.05). Results showed that strength and power improved significantly during the phase in the taper group (P<0.05). During the taper phase, the plasma levels of resting concentration of testosterone, cortisol and testosterone to cortisol ratio did not significantly change (P>0.05). A period of 70% decrease in training volume in runners 14 days before the contests can improve strength and power in addition to a decrease in fatigue which is independent of variations in catabolic and anabolic indices.