The effect of pedal rate on pulmonary O-2 uptake kinetics during very heavy intensity exercise in trained and untrained teenage boys

作者：Breese Brynmor C; Armstrong Neil; Barker Alan R; Williams Craig A^*

来源：Respiratory Physiology & Neurobiology, 2011, 177(2): 149-154.

DOI：10.1016/j.resp.2011.03.018

• Oxidative metabolism
• Youth
• Cycling
• Muscle fibre recruitment

This study tested the hypothesis that the (V) over dot(O2) kinetic response would be slowed in untrained (UT) but not trained (T) teenage participants whilst cycling at 115 rev min(-1) compared to 50 rev min(-1). Eight UT and seven T boys completed two square-wave transitions to very heavy-intensity exercise pedalling at 50 rev min(-1) and 115 rev min(-1). In UT at the higher pedal rate, the phase II (V) over dot(O2). tau was significantly (P < 0.01) slower (50 rev min(-1): 32 5 vs. 115 rev min(-1): 42 +/- 11 s) and the relative (V) over dot(O2) slow component was significantly (P < 0.01) elevated (50 rev min(-1): 10 +/- 3 vs. 115 rev min(-1): 16 +/- 5%). The phase II (V) over dot(O2) tau (50 rev min(-1): 26 +/- 4 vs. 115 rev min(-1): 22 +/- 6 s) and relative (V) over dot(O2) slow component (50 rev min(-1): 14 +/- 5 vs. 115 rev min(-1): 17 +/- 3%) were unaltered by pedal rate in T (P > 0.05). These data are consistent with the notion that (V) over dot(O2) kinetics are influenced by muscle fibre recruitment in youth but this effect is attenuated in endurance trained teenage boys.

• 出版日期2011-7-31