Rapid Weight Loss and the Body Fluid Balance and Hemoglobin Mass of Elite Amateur Boxers
Rapid Weight Loss and the Body Fluid Balance and Hemoglobin Mass of Elite Amateur Boxers
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DOI：
10.4085/1062-6050-48.1.05
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Friedmann-Bette, Birgit
中科院分区：
文献类型：
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作者：
Reljic, Dejan;Haessler, Eike;Friedmann-Bette, Birgit
背景：脱水被认为是在格斗运动中参加较低体重级别比赛的主要不良反应，与快速减重有关。目的：研究在比赛前几天体重下降5%或以上对优秀业余拳击手的体水、血容量和血浆容量的影响。设计：病例对照研究。地点：运动医学实验室。患者或其他参与者：17名男性拳击手(年龄=19.2+/-2.9岁，身高=175.1+/-7.0厘米，体重=65.6+/-9.2公斤)被分配到减肥组(WLG；对照组(n=7)。干预(S)：WLG通过限制液体和食物减少体重，并通过坚持个别方法导致大量汗失。主要结果测量(S)：在普通训练期(t-1)、赛前2天(t-2)、赛后1周(t-3)进行生物电阻抗测量，计算总体水、细胞内水和细胞外水；结果：WLG患者体重减少(5.6%+/-1.7%)时，体内总水分(6.0%+/-0.9%)、细胞外水分(12.4%+/-7.6%)、糖化血红蛋白(5.3%+/-3.8%)、血容量(7.6%+/-2.1%)均下降(P<0.05)。在t-3时，总体水、细胞外水和血浆容量已恢复到接近基线的值，但THb(质量)和血容量仍低于基线(P<；0.05)。在CON中，我们没有发现变化(P>；0.05)。结论：在现实生活中，在5天内体重减少约6%会导致水分不足，这表现为体内水分和血浆容量的减少。THB(质量)的减少是一个令人惊讶的观察结果，需要进一步研究。
Context: Dehydration is assumed to be a major adverse effect associated with rapid loss of body mass for competing in a lower weight class in combat sports. However, the effects of such weight cutting on body fluid balance in a real-life setting are unknown.Objective: To examine the effects of 5% or greater loss of body mass within a few days before competition on body water, blood volume, and plasma volume in elite amateur boxers.Design: Case-control study.Setting: Sports medicine laboratory.Patients or Other Participants: Seventeen male boxers (age = 19.2 +/- 2.9 years, height = 175.1 +/- 7.0 cm, mass = 65.6 +/- 9.2 kg) were assigned to the weight-loss group (WLG; n = 10) or the control group (CON; n = 7).Intervention(s): The WLG reduced body mass by restricting fluid and food and inducing excessive sweat loss by adhering to individual methods. The CON participated in their usual precompetition training.Main Outcome Measure(s): During an ordinary training period (t-1), 2 days before competition (t-2), and 1 week after competition (t-3), we performed bioelectrical impedance measurements; calculated total body water, intracellular water, and extracellular water; and estimated total hemoglobin mass (tHb(mass)) blood volume, and plasma volume by the CO-rebreathing method.Results: In the WLG, the loss of body mass (5.6% +/- 1.7%) led to decreases in total body water (6.0% +/- 0.9%), extracellular water (12.4% +/- 7.6%), tHbma (5.3% +/- 3.8%), blood volume (7.6% +/- 2.1%; P .05). At t-3, total body water, extracellular water, and plasma volume had returned to near baseline values, but tHb(mass) and blood volume still were less than baseline values (P < .05). In CON, we found no changes (P >.05).Conclusions: In a real-life setting, the loss of approximately 6% body mass within 5 days induced hypohydration, which became evident by the decreases in body water and plasma volume. The reduction in tHb(mass) was a surprising observation that needs further investigation.