Hemoglobin/myoglobin oxygen desaturation during Alpine skiing.
Hemoglobin/myoglobin oxygen desaturation during Alpine skiing.
复制标题
高山滑雪期间血红蛋白/肌红蛋白氧饱和度降低。
DOI：
10.1097/00005768-200102000-00010
复制
发表时间：
2001
影响因子：
4.1
通讯作者：
Rundell,KW
中科院分区：
文献类型：
--
作者：
Szmedra,L;Im,J;Nioka,S;Chance,B;Rundell,KW
目的研究模拟大回转（GS）和小回转（SL）高山滑雪比赛中肌肉血容量（BV）和血红蛋白/肌红蛋白氧饱和度（OD）的变化。方法对30名9--17岁（13.5 ± 2.3）岁的青少年优秀滑雪运动员在GS和SL比赛中的关节角、BV、OD和心率（HR）进行了测定。受试者按滑雪等级和年龄分层：I组，J1和J2，年龄15- 18岁（16.8 ± 0.8）; II组，J3，13- 14岁（13.6 ± 0.7）; III组，J 4和J5，9- 12岁（11.5 ± 1.2）。采用近红外分光光度法（NIRS）测定股外侧肌毛细血管床的BV和OD。在股袖缺血（CI）期间确定最大OD。通过皮褶和大腿周长估计四头肌横截面积（CSA）。结果关节角度较小踝关节GS组较SL组有显著性差异（P< 0.05）（83.8+/-11.9度; 98.6+/-15.7度）、膝关节（107.4+/-14.9度; 118.3+/-18.0度）和髋关节（98.8+/-14.3度; 107.5+/-16.2度）。GS期间从休息到运动峰值的BV减少（Delta BV）比SL期间大30%（P< 0.05），而GS期间Delta OD大33%（P< 0.05）。相对于CI OD，GS期间所有受试者的Δ OD（79.2+/-3.7%）大于SL期间（65.7+/-4.4%）。这种模式在组内持续;组II显示最大的相对去饱和（82.9+/-7.6%）。年龄较大的滑雪者CSA较大（92.5+/-21.6; 72.5+/-12.3; 65.3+/-21.2 cm（2）），并与Delta OD相关结论BV下降幅度越大，（Δ BV变化）当滑雪者在GS中采取较低姿势时，比SL中更大的OD可能与更大的有效静态负荷有关，其次是最大自主收缩百分比更高与工作肌肉的血流受损一致
PurposeTo investigate muscle blood volume (BV) change and hemoglobin/myoglobin oxygen desaturation (OD) during simulated giant slalom (GS) and slalom (SL) Alpine ski racing.MethodsJoint angle, BV, OD, and heart rate (HR) were evaluated during GS and SL events in 30 junior elite skiers ages 9--17 yr (13.5+/-2.3). Subjects were stratified by ski class and age: group I, J1 and J2, ages 15--18 yr (16.8+/-0.8); group II, J3, 13--14 yr (13.6+/-0.7); and group III, J4 and J5, 9--12 yr (11.5+/-1.2). Near-infrared spectrophotometry (NIRS) was used to measure BV and OD in the capillary bed of the vastus lateralis during trials. Maximal OD was determined during thigh cuff ischemia (CI). Quadriceps cross-sectional area (CSA) was estimated by skin-fold and thigh circumference.ResultsJoint angles were smaller (P< 0.05) during GS than SL for ankle (83.8+/-11.9 degrees; 98.6+/-15.7 degrees), knee (107.4+/-14.9 degrees; 118.3+/-18.0 degrees), and hip (98.8+/-14.3 degrees; 107.5+/-16.2 degrees). BV reduction from rest to peak exercise (Delta BV) was 30% greater (P< 0.05) during the GS than SL, whereas Delta OD was 33% greater (P< 0.05) during GS. Delta OD, relative to CI OD, was greater for all subjects during GS (79.2+/-3.7%) than SL (65.7+/-4.4%). This pattern continued within groups; group II displayed the greatest relative desaturation (82.9+/-7.6%). CSA was larger in older skiers (92.5+/-21.6; 72.5+/-12.3; 65.3+/-21.2 cm (2)) and correlated with Delta OD (P< 0.05).ConclusionThe larger reduction in BV (Delta BV change) and greater OD when skiers assumed lower posture during GS than SL may be related to greater effective static load secondary to higher percent of maximal voluntary contraction and is consistent with compromised blood flow to working muscle.