不同悬架系统山地自行车的生理反应和性能比较。

Comparison of physiological responses and performance between mountain bicycles with differing suspension systems.

机构信息

Department of Kinesiology and Health Education, Southern Illinois University, Edwardsville, IL, USA.

出版信息

Int J Sports Physiol Perform. 2011 Dec;6(4):546-58. doi: 10.1123/ijspp.6.4.546.

DOI:10.1123/ijspp.6.4.546

PMID:22248554

Abstract

PURPOSE

This study compared the metabolic and performance effects of riding front-only suspension (FS) and front-and-rear suspension (FRS) mountain bicycles on an off-road course that simulated competitive cross-country race conditions (>105 min in duration, with ∼70% of time spent riding uphill).

METHODS

Seven competitive mountain bikers (73.8 ± 7.6 kg; 61.0 ± 4.3 mL·kg-1·min-1) completed two randomized FS and FRS trials. Bikes were similar, excluding rear wheel suspension on the FRS, which increased bike weight by ∼2 kg. Each trial consisted of four laps of rugged 8 km trail with 154 m of elevation gain per lap. The first three laps were performed at ∼70% of VO2max; VO2, HR, and RPE were collected during the first and third laps. The final lap was performed as a maximal time-trial effort.

RESULTS

During the first and third laps, VO2, HR, and RPE were similar between FS and FRS. However, FS was significantly faster than FRS during the ascending segment of the course (17.6 ± 2.9 vs 18.9 ± 3.4 min, P = .035), despite similar VO2 (P = .651). Although not statistically significant, FRS tended to be faster than FS during the descending portion of the course (8.1 ± 2.0 vs 9.1 ± 2.1, P = .067) at similar VO2. Performance during the final time-trial lap was significantly faster for FS than FRS (24.9 ± 3.9 min, 27.5 ± 4.9 min, P = .008).

CONCLUSION

FS was faster than FRS over a course that simulated competitive cross-country race conditions. The faster times were likely the result of improved cycling economy during ascending, which were at least partially influenced by the lighter weight of the FS.

摘要

目的

本研究比较了在模拟越野赛条件的下坡赛道上，只骑前悬架（FS）和前后悬架（FRS）的山地自行车的代谢和性能效果。这个赛道的比赛时间超过 105 分钟，大约 70%的时间是上坡骑行。

方法

7 名有竞争力的山地自行车手（73.8±7.6kg；61.0±4.3mL·kg-1·min-1）完成了两个随机的 FS 和 FRS 试验。自行车相似，除了 FRS 的后轮悬架，这增加了自行车的重量约 2kg。每个试验包括四个 8 公里的崎岖小道，每个圈有 154 米的海拔上升。前三个圈以大约 70%的最大摄氧量进行；在第一和第三个圈中收集 VO2、HR 和 RPE。最后一圈作为最大时间试验努力进行。

结果

在第一和第三个圈中，FS 和 FRS 的 VO2、HR 和 RPE 相似。然而，在赛道的上坡段，FS 比 FRS 快（17.6±2.9 比 18.9±3.4 分钟，P=0.035），尽管 VO2 相似（P=0.651）。尽管没有统计学意义，但在赛道的下坡段，FRS 比 FS 快（8.1±2.0 比 9.1±2.1，P=0.067），而 VO2 相似。在最后的计时圈中，FS 的表现明显快于 FRS（24.9±3.9 分钟，27.5±4.9 分钟，P=0.008）。