Hue O, Boussana A, Le Gallais D, Prefaut C
Laboratoire ACTE, UFR-STAPS, Antilles-Guyane, Pointe à Pitre Cedex, France.
J Sports Med Phys Fitness. 2003 Mar;43(1):44-50.
Running performance has become key to the triathlete's overall performance. We still know relatively little about the factors that define the ability to perform a good run after cycling, however, and the perception of discomfort during the first minutes of this post-cycling running has yet to be satisfactorily explained. Pulmonary volumes (i.e., residual volume, RV, and functional residual capacity, FRC) have been demonstrated to be impaired after a cycle-run succession in triathletes but not after a run-run succession that is matched in terms of intensity and duration. Cycling in itself and/or the succession of two different exercises (i.e., cycling and running) may explain this phenomenon, but the exact mechanism has not yet been determined.
Thirteen young male triathletes participated in three different exercise trials: 30 min of cycling followed by 20 min of running (C-R), 30 min of control cycling (C) and 20 min of control running (R). Pulmonary volumes and flows were measured 10 min before and 10 min after each trial. During all trials, ventilatory data were collected every minute using an automated breath-by-breath system.
The results showed that 1) C induced significant increases in RV, FRC and RV/TLC (2.31+/-0.18 vs 2.01+/-0.17 L, 4.35+/-0.24 vs 4.01+/-0.25 L, and 27.21+/-1.62 vs 23.98+/-1.55, respectively, after versus before C) and 2) there were no significant pulmonary volume or flow changes after C-R or R.
We concluded that 1) cycling exercise in itself seems to increase the post-exercise pulmonary volume changes which could lead to respiratory muscle alterations and 2) one likely explanation for this finding appears to be the crouched position of cycling.
跑步表现已成为铁人三项运动员整体表现的关键。然而，我们对决定骑行后良好跑步能力的因素仍知之甚少，且骑行后跑步最初几分钟的不适感尚未得到令人满意的解释。已证明，铁人三项运动员在进行骑行 - 跑步连续运动后肺容积（即残气量，RV，和功能残气量，FRC）会受损，但在强度和持续时间匹配的跑步 - 跑步连续运动后则不会。骑行本身和/或两种不同运动（即骑行和跑步）的连续进行可能解释了这一现象，但确切机制尚未确定。
13名年轻男性铁人三项运动员参加了三项不同的运动试验：30分钟骑行后接着20分钟跑步（C - R）、30分钟对照骑行（C）和20分钟对照跑步（R）。在每次试验前10分钟和后10分钟测量肺容积和肺流量。在所有试验期间，使用自动逐次呼吸系统每分钟收集通气数据。
结果显示，1）C导致RV、FRC和RV/TLC显著增加（C后分别为2.31±0.18 L、4.35±0.24 L和27.21±1.62，而C前分别为2.01±0.17 L、4.01±0.25 L和23.98±1.55），2）C - R或R后肺容积或肺流量无显著变化。
我们得出结论，1）骑行运动本身似乎会增加运动后肺容积变化，这可能导致呼吸肌改变，2）这一发现的一个可能解释似乎是骑行时的蹲伏姿势。
