Wilkinson J G, Martin D T, Adams A A, Liebman M
Human Energy Research Laboratory, Division of Kinesiology and Health, University of Wyoming, Laramie 82071, USA.
Int J Sports Med. 2002 Nov;23(8):544-8. doi: 10.1055/s-2002-35528.
The purpose of this study was to examine the effects of a 6 week high-intensity interval training (HIT) program, followed by 2 weeks recovery, on iron status in cyclists. Eleven male collegiate cyclists (21.8 +/- 0.8 yr, 71.4 +/- 2.2 kg, and 8.6 +/- 0.9 % body fat) participated in a 6 week cycle training program that consisted of 5 days of high intensity interval and endurance training per week. Hematocrit (Hct), hemoglobin (Hb), red blood cell (RBC) count, serum iron, serum ferritin, and total iron binding capacity (TIBC) were analyzed from venous blood samples taken at baseline (B), and each week following interval training (T1-T6) and recovery (R1-R2). Dietary intakes including iron were monitored weekly. The dependent variables were analyzed by repeated measures ANOVA (p < 0.05). RBC count, Hb and Hct were significantly decreased compared to baseline at T3. Serum iron did not change significantly. Serum ferritin decreased significantly from 55.9 +/- 9.7 at B to 42.2 +/- 8.0 ng x ml -1 at T5 and remained depressed at T6, R1 and R2. TIBC was significantly increased above baseline at T3, T4, T6, R1 and R2. These results suggest that 6 weeks of high-intensity interval training can reduce iron stores. It is possible that this reduction in iron stores over time could adversely affect aerobic cycling performance.
本研究的目的是检验为期6周的高强度间歇训练（HIT）计划（随后2周恢复）对自行车运动员铁状态的影响。11名男性大学自行车运动员（年龄21.8±0.8岁，体重71.4±2.2千克，体脂率8.6±0.9%）参加了为期6周的自行车训练计划，该计划包括每周5天的高强度间歇训练和耐力训练。从基线（B）以及间歇训练（T1-T6）和恢复（R1-R2）后的每周采集的静脉血样本中分析血细胞比容（Hct）、血红蛋白（Hb）、红细胞（RBC）计数、血清铁、血清铁蛋白和总铁结合力（TIBC）。每周监测包括铁在内的饮食摄入量。通过重复测量方差分析对因变量进行分析（p<0.05）。与基线相比，T3时RBC计数、Hb和Hct显著降低。血清铁无显著变化。血清铁蛋白从B时的55.9±9.7显著降至T5时的42.2±8.0 ng x ml-1，并在T6、R1和R2时仍保持较低水平。T3、T4、T6、R1和R2时TIBC显著高于基线。这些结果表明，6周的高强度间歇训练可减少铁储备。随着时间的推移，铁储备的这种减少可能会对有氧自行车运动表现产生不利影响。
