The purpose of this study was to examine the effects of a 4-week reduction in training volume and intensity on performance of distance runners. Ten well-conditioned males underwent 4-weeks of base training (BT) at their accustomed training distance (71.8 ± 3.6 km/wk) and pace (76% of total distance above 70% V02 max intensity), before reducing training (RT) for an additional 4 weeks. Training volume was decreased by -.66% to 24.8 km/wk and frequency by 50% to 3 runs per week. Training intensity was reduced such that all running was at less than 70% V02 max (68.2 ± 1.6%). At the end of BT (week 0), and weeks 2 and 4 of RT, resting heart rate, calculated plasma volume, testosterone and cortisol levels, and submaximal treadmill efficiency were assessed. At weeks 0 and 4, V02 max and 5 kilometer race performance was determined. The ratio of testosterone to cortisol was increased significantly with RT (0.054 ± 0.008 at week 0 to 0.082 ± 0.020 at week 4), although the individual testosterone and cortisol concentrations were not significantly altered. Maximum oxygen consumption, and time to exhaustion during the max tests were not altered with RT. Body weight tended to increase (p=0.09) due to a significant increase in percent body fat (p<0.05). Submaximal treadmill runs at 65%, 85%, and 95% V02 max revealed no alterations in absolute V02 while relative V02 decreased significantly. This decrease in relative V02 was due partially to the weight increases and partially to a significant increase in respiratory exchange ratio (RER). Resting and submaximal treadmill heart rate (HR) were unchanged with FIT, while maximal treadmill HR and race HR were increased significantly. Calculated plasma volume was unaltered. Leg and overall ratings of perceived exertion were decreased during RT with the overall rating reaching significance (p<0.05). Blood lactic acid concentration was found to be significantly higher at the 95% V02 max workload following RT (8.39 ± 0.46 vs 9.89 ± 0.46 mmol/L at week 0 and 4, respectively). Five kilometer race time increased significantly from 16.6 ± 0.3 at week 0 to 16.8 ± 0.3 minutes at week 4 (12.1 seconds). It is concluded that a 4-week reduction in training volume and intensity in these runners resulted in a significant decrease in race performance despite the maintenance of aerobic capacity. / School of Physical Education
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:handle/184207 |
| Date | January 1991 |
| Creators | McConell, Glenn Kevin |
| Contributors | Ball State University. School of Physical Education., Costill, David L. |
| Source Sets | Ball State University |
| Detected Language | English |
| Format | ix, 57 leaves : ill. ; 28 cm. |
| Source | Virtual Press |
Page generated in 0.0019 seconds