Seifert J G, Luetkemeier M J, Spencer M K, Miller D, Burke E R
Dept. of HPES-SE, West Liberty State College, WV, USA.
Int J Sports Med. 1997 Apr;18(3):197-200. doi: 10.1055/s-2007-972619.
The purpose of this 3-Phase study was to investigate the effects of suspension systems on muscular stress, energy expenditure, and time trial performance during mountain biking. Three suspension systems were tested, a rigid frame bike (RIG), a suspension fork bike (FS), and a front and rear suspension bike (FSR). Phase I and II consisted of cycling at 16.1 km.hr-1 over a flat, bumpy course for 63 min. Phase III consisted of ascending (ATT), descending (DTT), and cross country (XTT) time trials. Phase I assessed muscular stress by 24 h change in CK, Phase II assessed HR, VO2, VE, and Phase III assessed performance responses to the suspension systems. The 24 hr change in CK was greater for RIG than FS and FSR (+91.9 +/- 79.5 IU vs +8.6 +/- 17.5 IU and +9.7 +/- 21.8 IU). Mean HR was greater for RIG than FS and FSR (153.7 +/- 15.6 bpm vs 146.7 +/- 15.4 bpm, 146.3 +/- 16.2 bpm). Subjects rode significantly faster on FS than FSR and RIG during the XTT (30.9 +/- 2.0 min vs 32.3 +/- 3.6 min, 32.3 +/- 3.2 min). Subjects RPE was lower for FSR than FS and RIG, however, no differences were observed for VO2, VE, ATT, or DTT. Cyclists incurred less muscular stress, indicated by CK and HR, when riding the FS and FSR. Although the FS and FSR weigh from 0.7 to 2.2 kg more than RIG, no differences were observed for energy expenditure and that riding the FS in a XTT resulted in a faster finishing time than FSR or RIG.
这项三阶段研究的目的是调查山地自行车骑行过程中，避震系统对肌肉压力、能量消耗以及计时赛表现的影响。测试了三种避震系统，分别是硬架自行车（RIG）、前叉避震自行车（FS）和前后避震自行车（FSR）。第一阶段和第二阶段包括在平坦且颠簸的赛道上，以16.1千米/小时的速度骑行63分钟。第三阶段包括爬坡计时赛（ATT）、下坡计时赛（DTT）和越野计时赛（XTT）。第一阶段通过肌酸激酶（CK）24小时内的变化评估肌肉压力，第二阶段评估心率（HR）、摄氧量（VO2）、每分通气量（VE），第三阶段评估对避震系统的性能反应。RIG的CK 24小时变化大于FS和FSR（+91.9±79.5国际单位 vs +8.6±17.5国际单位和+9.7±21.8国际单位）。RIG的平均心率高于FS和FSR（153.7±15.6次/分钟 vs 146.7±15.4次/分钟，146.3±16.2次/分钟）。在越野计时赛（XTT）中，受试者骑FS时的速度明显快于FSR和RIG（30.9±2.0分钟 vs 32.3±3.6分钟，32.3±3.2分钟）。FSR的受试者主观用力程度（RPE）低于FS和RIG，然而，在VO2、VE、ATT或DTT方面未观察到差异。骑行FS和FSR时，骑行者的肌肉压力较小，这由CK和心率表明。尽管FS和FSR比RIG重0.7至2.2千克，但在能量消耗方面未观察到差异，并且在越野计时赛中骑FS比FSR或RIG完成时间更快。
