Improved running economy following intensified training correlates with reduced ventilatory demands

被引:101
作者
Franch, J
Madsen, K
Djurhuus, MS
Pedersen, PK
机构
[1] Odense Univ, Dept Sports Sci & Phys Educ, Inst Sports Sci & Phys Educ, DK-5230 Odense M, Denmark
[2] Odense Univ Hosp, Dept Clin Chem, DK-5000 Odense, Denmark
关键词
VO2max; endurance capacity; running velocity at VO2max; muscle fiber type distribution;
D O I
10.1097/00005768-199808000-00011
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
Purpose: To compare the affects of three types of intensive run training on running economy (RE) during exhaustive running and to establish possible relationships with changes in ventilatory function and/or muscle fiber type distribution, Methods: Thirty-six male recreational runners were divided into three groups and assigned to either exhaustive distance training (DT), long-interval training (LIT), or short-interval training (SIT) three times 20-30 min . wk(-1) for 6 wk. (V) over dot O-2max and RE were measured during treadmill running before and after training. Muscle fiber type distribution of the vastus lateralis muscle was established from biopsy material. Results: (V) over dot O-2max (L . min(-1)) increased by 5.9% (P < 0.0001), 6.0% (P < 0.0001), and 3.6% (P < 0.01) in DT, LIT, and SIT, respectively, and running speed at (V) over dot O-2max by 9% (P < 0.0001), 10% (P < 0.0001), and 4% (P < 0.05), respectively. Time-to-exhaustion at 87% of pretraining (V) over dot O-2max (mean 3.83 m . s(-1)) increased by 94% in DT (P < 0.0001), 67% in LIT (P < 0.0001), and 65% in SIT (P < 0.001). Running economy improved by 3.1% in DT (P < 0.05), 3.0% in LIT (P < 0.01), and 0.9% in SIT (NS); pulmonary ventilation ((V) over dot E) was on average 11 L . min(-1) lower following training (P < 0.0001). The individual decrements in (V) over dot E correlated with improvements in RE (r = 0.77; P < 0.0001) and may account for 25-70% of the decrease in aerobic demand. Muscle fiber composition, and respiratory exchange ratio, stride length, and stride frequency during running were unaltered with training. Conclusion: Recreational runners can improve RE and aerobic run performance by exchanging parts of their conventional aerobic distance training with intensive distance or long-interval running, whereas short-interval running is less efficient. The improvement in RE may relate to reduced ventilatory demands. Muscle fiber type distribution was unaltered with training and showed no association with RE.
引用
收藏
页码:1250 / 1256
页数:7
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