运动员和肥胖男女的脂肪氧化与乳酸阈的关系。
Relationship between Fat Oxidation and Lactate Threshold in Athletes and Obese Women and Men.
机构信息
Institute of Sports Medicine, Swiss Paraplegic Centre , Nottwil, Switzerland ; Institute of Rehabilitation and Prevention, German Sport University Cologne , Germany.
Institute of Sports Medicine, Swiss Paraplegic Centre , Nottwil, Switzerland ; Clinic for Physical Medicine and Rehabilitation, Thurgauer Klinik St. Katharinental , Diessenhofen, Switzerland.
出版信息
J Sports Sci Med. 2004 Sep 1;3(3):174-81. eCollection 2004 Sep.
The first aim of this study was to determine the exercise intensity that elicited the highest rate of fat oxidation in sedentary, obese subjects (OB; n=10 men, n=10 women) compared with endurance athletes (AT; n=10 men, n=10 women). The second aim was to investigate the relationship between VO2 at the intensity eliciting the highest rate of fat oxidation and the corresponding VO2 at the lactate threshold. Peak oxygen consumption (VO2peak) was determined in 20 AT and 20 OB using an incremental exercise protocol on a cycle ergometer. Based on their VO2peak values, subjects completed a protocol requiring them to exercise for 20 min at three different workloads (55, 65 and 75% VO2peak), randomly assigned on two separate occasions. The oxidation rates of fat and carbohydrate were measured by indirect calorimetry. The highest rates of fat oxidation were at 75 % VO2peak (AT), and at 65 % VO2peak (OB). The rate of fat oxidation was significantly higher in AT (18.2 ± 6.1) compared with OB women (10.6 ± 4.5 kJ min(-1)·kg(-1)) (p < 0.01). There was no significant difference in the rate of fat oxidation for the men (AT 19.7 ± 8.1 vs. OB 17.6 ± 8.2 kJ min(-1)·kg(-1)). AT reached LT at a significantly (p < 0.01) higher exercise intensity expressed in VO2peak than obese subjects (AT women 76.4 ± 0.1, men 77.3 ± 0.1 vs. OB women, 49.7 ± 0.1, men 49.5 ± 0.1% VO2peak). A significant correlation was found between VO2 at LT and VO2 (L·min(-1)) eliciting the maximal rate of fat oxidation in athletes (women; r = 0.67; p = 0.03; men: r = 0.75; p = 0.01) but not in the obese. In summary, we observed higher rates of fat oxidation at higher relative work rates in AT compared with OB. A significant correlation was found between LT and the exercise intensity eliciting a high rate of fat oxidation in AT (r=0.89; p < 0.01) but not in OB. Cardiorespiratory fitness, defined as VO2peak, seems to be important in defining the relationship between a high rate of fat oxidation and LT. Key PointsWithin the tested intensities of 55, 65 and 75% VO2peak athletes reached higher rates of fat oxidation at higher relative work rates compared with obese subjects.We found in obese women and men the intensity of the highest rate of fat oxidation at 65% VO2peak.Between the lactate threshold and the intensity eliciting a high rate of fat oxidation a significant correlation was found in athletes but not in obese subjects.
本研究的首要目的是确定诱发静息肥胖受试者（OB；n=10 男，n=10 女）和耐力运动员（AT；n=10 男，n=10 女）最高脂肪氧化率的运动强度。第二个目的是调查在诱发最大脂肪氧化率的 VO2 与相应的乳酸阈 VO2 之间的关系。20 名 AT 和 20 名 OB 采用递增运动方案在自行车测力计上确定峰值耗氧量（VO2peak）。根据他们的 VO2peak 值，受试者在两次单独的测试中完成了三个不同工作量（55、65 和 75%VO2peak）的 20 分钟运动协议。通过间接测热法测量脂肪和碳水化合物的氧化率。最高的脂肪氧化率出现在 75%VO2peak（AT）和 65%VO2peak（OB）。与 OB 女性（10.6±4.5kJmin-1kg-1）相比，AT 中的脂肪氧化率（18.2±6.1）显著更高（p<0.01）。男性的脂肪氧化率无显著差异（AT 19.7±8.1 与 OB 17.6±8.2kJmin-1kg-1）。AT 达到 LT 的运动强度（以 VO2peak 表示）明显高于肥胖受试者（AT 女性 76.4±0.1，男性 77.3±0.1 与 OB 女性 49.7±0.1，男性 49.5±0.1%VO2peak）。我们发现运动员（女性；r=0.67；p=0.03；男性：r=0.75；p=0.01）在 LT 和诱发最大脂肪氧化率的 VO2（L·min-1）之间存在显著相关性，但肥胖者没有。总之，与 OB 相比，AT 在更高的相对工作率下表现出更高的脂肪氧化率。在 AT 中，我们发现 LT 和诱发高脂肪氧化率的运动强度之间存在显著相关性（r=0.89；p<0.01），但在 OB 中没有。心肺适能，定义为 VO2peak，似乎在定义高脂肪氧化率与 LT 之间的关系方面很重要。关键点在 55、65 和 75%VO2peak 测试强度范围内，运动员在更高的相对工作率下达到更高的脂肪氧化率。我们发现肥胖女性和男性在 65%VO2peak 时达到最高脂肪氧化率的强度。在运动员中，我们发现 LT 和诱发高脂肪氧化率的强度之间存在显著相关性，但在肥胖者中没有。
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