Hemoglobin/myoglobin desaturation during speed skating
Hemoglobin/myoglobin desaturation during speed skating
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DOI：
10.1097/00005768-199702000-00014
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发表时间：
1997-02-01
期刊：
影响因子：
--
通讯作者：
Chance, B
中科院分区：
文献类型：
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作者：
Rundell, KW;Nioka, S;Chance, B
与跑步或骑自行车相比，竞争性速度滑冰的特征性低“坐"位置已被证明会导致心率-VO 2曲线右移，并导致次最大血乳酸值升高。这被认为是速滑时血流减少和随后氧气输送到运动肌肉的结果。采用双波长分光光度法测定了直排轮滑运动中5个肌群毛细血管床的氧合和脱氧血红蛋白/肌红蛋白（OD）。八名美国速滑运动员（4名1类）在2.68米和3.13米处进行了美国和LS。s（-1）（4%等级）在宽（2.44 m）跑步机上（4次试验，每次5 min，试验之间恢复20 min）。测定每项试验的呼气参数和血乳酸（LA）浓度。测量了髋关节和膝关节角度（峰值运动分析），US和LS的髋关节和膝关节角度显著不同。对于US和LS期间相似的摄氧量（44.9 +/- 2.79，45.6 +/- 3.52），LS期间的心率和LA显著更高（172 +/- 11 vs 179 +/- 10，4.35 +/- 2.19 vs 8.70 +/- 3.60）。在两种速度下，LS期间的脱氧显著大于US期间，并且在3.13 m处更大。s（-1）（P < 0.05）。OD与LA高度相关（r > 0.95），但与全身VO 2无关。LS的血容量变化小于US（P < 0.05）。LS与US期间运动股四头肌毛细血管床中的脱氧增加与血流和随后的O-2输送在低速滑冰位置中受到损害的假设一致。
The characteristic low ''sitting'' position of competitive speed skating has been shown to result in a right shifted heart rate-VO2 curve and elevated submaximal blood lactate values compared with running or cycling. This is thought to be a consequence of reduced blood flow and subsequent oxygen delivery to the exercising muscle while speed skating. Duel wavelength spectrophotometry was used to measure oxygenated and deoxygenated hemoglobin/myoglobin (OD) in the capillary bed of five muscle groups during in-line skating in upright (US) and low (LS) positions. Eight U.S. speed skaters (4 category 1) performed US and LS at 2.68 and 3.13 m . s(-1) (4% grade) on a wide (2.44 m) treadmill (4 trials, 5 min each, 20 min recovery between trials). Expired gas parameters and blood lactate (LA) concentrations were determined for each trial. Hip and knee angles were measured (PEAK Motion Analysis) and were significantly different in US and LS. For similar oxygen uptake during US and LS (44.9 +/- 2.79, 45.6 +/- 3.52), heart rate and LA were significantly higher during LS (172 +/- 11 vs 179 +/- 10, 4.35 +/- 2.19 vs 8.70 +/- 3.60). Deoxygenation was significantly greater during LS than during US at both speeds and was greater at 3.13 m . s(-1) (P < 0.05). OD was highly related to LA (r > 0.95) but not to whole body VO2. Blood volume change was less for LS than for US (P < 0.05). Increased deoxygenation in the capillary bed of the exercising quadriceps during LS versus US is consistent with the hypothesis that blood flow and subsequent O-2 delivery is compromised in the low speed skating position.