AGING AND FACTORS RELATED TO RUNNING ECONOMY

作者：Quinn Timothy J^*; Manley Michelle J; Aziz Jason; Padham Jamie L; MacKenzie Allison M

来源：Journal of Strength and Conditioning Research, 2011, 25(11): 2971-2979.

DOI：10.1519/JSC.0b013e318212dd0e

• running efficiency
• lactate threshold
• running performance
• stride determinants
• strength
• power

Quinn, TJ, Manley, MJ, Aziz, J, Padham, JL, and MacKenzie, AM. Aging and factors related to running economy. J Strength Cond Res 25(11): 2971-2979, 2011-The purpose of this study was to investigate the relationship that age has on factors affecting running economy (RE) in competitive distance runners. Fifty-one male and female subelite distance runners (Young [Y]: 18-39 years [n = 18]; Master [M]: 40-59 years [n = 22]; and Older [O]: 60-older [n = 11]) were measured for RE, step rate, lactate threshold (LT), VO(2)max, muscle strength and endurance, flexibility, power, and body composition. An RE test was conducted at 4 different velocities (161, 188, 215, and 241 m.min(-1)), with subjects running for 5 minutes at each velocity. The steady-state V O(2) during the last minute of each stage was recorded and plotted vs. speed, and a regression equation was formulated. A 1 x 3 analysis of variance revealed no differences in the slopes of the RE regression lines among age groups (y = 0.1827x - 0.2974; R(2) = 0.9511 [Y]; y = 0.1988x - 1.0416; R(2) = 0.9697 [M]; y = 0.1727x + 3.0252; R(2) = 0.9618 [O]). The VO(2)max was significantly lower in the O group compared to in the Y and M groups (Y = 64.1 +/- 3.2; M = 56.8 +/- 2.7; O = 44.4 +/- 1.7 mlO(2).kg(-1).min(-1)). The maximal heart rate and velocity @ LT were significantly different among all age groups (Y = 197 6 4; M = 183 +/- 2; O = 170 +/- 6 b.min(-1) and Y = 289.7 +/- 27.0; M = 251.5 +/- 32.9; O = 212.3 +/- 24.6 m.min(-1), respectively). The V O(2) @ LT was significantly lower in the O group compared to in the Y and M groups (Y = 50.3 +/- 2.0; M = 48.8 +/- 2.9; O = 34.9 +/- 3.2 mlO(2). kg(-1).min(-1)). The O group was significantly lower than in the Y and M groups in flexibility, power, and upper body strength. Multiple regression analyses showed that strength and power were significantly related to running velocity. The results from this cross-sectional analysis suggest that age-related declines in running performance are associated with declines in maximal and submaximal cardiorespiratory variables and declines in strength and power, not because of declines in running economy.

• 出版日期2011-11