Deruisseau Keith C, Roberts Lara M, Kushnick Michael R, Evans Allison M, Austin Krista, Haymes Emily M
Department of Nutrition, Food, and Exercise Sciences, 436 Sandels Building, Florida State University, Tallahassee, FL 32306-1493, USA.
Med Sci Sports Exerc. 2004 Feb;36(2):241-8. doi: 10.1249/01.MSS.0000113483.13339.7B.
To determine the effect of weight training on measures of iron status in young males and females.
Forty (27 female, 13 male) non-weight-trained college age subjects participated in a 12-wk weight-training program conducted 3 d.wk-1. Blood samples and food diaries were obtained pretraining and at 4-wk intervals. Blood was analyzed for hemoglobin, hematocrit, serum iron (SI), total iron binding capacity (TIBC), transferrin saturation (TS), serum ferritin (SF), soluble transferrin receptor (sTfR), and creatine kinase (CK). Subjects were grouped by SF level (FL, females < or = 20 microg.L-1; FN, females > 20 microg.L-1; ML, males < or = 45 microg.L-1; MN, males > or = 50 microg.L-1) to determine the impact of initial iron status on measured responses.
Weight training increased strength and fat-free mass and decreased levels of percent body fat. Hemoglobin concentration declined after 12 wk of training (13.7 +/- 1.6 vs 13.2 +/- 1.7 g.dL-1), independent of gender or initial iron status. Only the MN group experienced a decline in SF level after 8 wk of training (129.7 +/- 77.9 vs 102.0 +/- 57.8 microg.L-1). No significant changes were observed for hematocrit, SI, TIBC, TS, sTfR, or CK measures. Total iron intake, but not heme or bioavailable iron intakes, declined at the 12th week of training compared with baseline (13.4 +/- 6.5 vs 10.7 +/- 4.8 mg.d-1) and was not significantly correlated with hematological or iron status measures.
Hemoglobin concentration declines without alterations in SI, TIBC, TS, or sTfR after 12 wk of weight training. The SF level of males with adequate iron status is lowered with weight training but not among females or males with low iron status.
确定重量训练对年轻男性和女性铁状态指标的影响。
40名（27名女性，13名男性）未进行过重量训练的大学适龄受试者参加了一项为期12周的重量训练计划，每周进行3天。在训练前以及每隔4周采集血样和食物日记。分析血液中的血红蛋白、血细胞比容、血清铁（SI）、总铁结合力（TIBC）、转铁蛋白饱和度（TS）、血清铁蛋白（SF）、可溶性转铁蛋白受体（sTfR）和肌酸激酶（CK）。根据SF水平对受试者进行分组（FL，女性≤20μg.L-1；FN，女性＞20μg.L-1；ML，男性≤45μg.L-1；MN，男性≥50μg.L-1），以确定初始铁状态对测量反应的影响。
重量训练增加了力量和去脂体重，并降低了体脂百分比水平。训练12周后血红蛋白浓度下降（13.7±1.6 vs 13.2±1.7 g.dL-1），与性别或初始铁状态无关。只有MN组在训练8周后SF水平下降（129.7±77.9 vs 102.0±57.8μg.L-1）。血细胞比容、SI、TIBC、TS、sTfR或CK测量值未观察到显著变化。与基线相比，训练第12周时总铁摄入量下降，但血红素或生物可利用铁摄入量未下降（13.4±6.5 vs 10.7±4.8 mg.d-1），且与血液学或铁状态指标无显著相关性。
重量训练12周后血红蛋白浓度下降，而SI、TIBC、TS或sTfR无变化。铁状态充足的男性进行重量训练后SF水平降低，但铁状态低的女性或男性中未出现这种情况。
