MUSCLE RESPIRATORY CAPACITY AND FIBER TYPE AS DETERMINANTS OF THE LACTATE THRESHOLD
MUSCLE RESPIRATORY CAPACITY AND FIBER TYPE AS DETERMINANTS OF THE LACTATE THRESHOLD
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DOI：
10.1152/jappl.1980.48.3.523
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发表时间：
1980-01-01
影响因子：
3.3
通讯作者：
COSTILL, DL
中科院分区：
文献类型：
--
作者：
IVY, JL;WITHERS, RT;COSTILL, DL
本研究检测了个体骨骼肌的呼吸能力与血乳酸开始积累时的工作率（乳酸阈值）之间的关系。还在纤维类型、VO2 max和乳酸盐阈值之间进行比较。从股外侧肌进行肌肉活检，以测定呼吸能力和纤维类型（肌球蛋白ATP酶）。根据绝对工作率（≥ VO2）和相对工作率（% ≥ VO2max）评估乳酸盐阈值。肌匀浆氧化丙酮酸的能力与绝对乳酸阈（r = 0.94）和相对乳酸阈（r = 0.83）均呈显著相关（P < 0.01）。慢缩纤维百分比与绝对乳酸阈值（r = 0.74）和相对乳酸阈值（r = 0.70）均呈显著正相关（P < 0.01）。肌肉的呼吸能力在决定血乳酸开始积累的工作速率方面是最重要的。慢捻纤维的比例可能在决定乳酸阈中起重要作用。
This study examined the relationship between the respiratory capacity of an individual''s skeletal muscle and the work rate at which blood lactate accumulation begins (lactate threshold). Comparisons were also made among fiber type, .ovrhdot.VO2 max and the lactate threshold. Muscle biopsies were taken from the vastus lateralis muscle for determination for respiratory capacity and fiber type (myosin ATPase). The lactate threshold was assessed in terms of both the absolute work rate (.ovrhdot.VO2) and relative work rate (%.ovrhdot.VO2 max). The capacity of muscle homogenates to oxidize pyruvate was significantly (P < 0.01) related to the absolute (r = 0.94) and relative (r = 0.83) lactate thresholds. Significant positive correlations (P < 0.01) were also found between the percent of slow-twitch fibers and absolute (r = 0.74) and relative (r = 0.70) lactate thresholds. The muscle''s respiratory capacity is of primary importance in determining the work rate at which blood lactate accumulation begins. The proportion of slow-twich fibers may play an important role in determining the rlative lactate threshold.