FACTORS AFFECTING BLOOD-PRESSURE DURING HEAVY WEIGHT LIFTING AND STATIC CONTRACTIONS
FACTORS AFFECTING BLOOD-PRESSURE DURING HEAVY WEIGHT LIFTING AND STATIC CONTRACTIONS
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DOI：
10.1152/jappl.1992.73.4.1590
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发表时间：
1992-10-01
影响因子：
3.3
通讯作者：
BUICK, F
中科院分区：
文献类型：
--
作者：
MACDOUGALL, JD;MCKELVIE, RS;BUICK, F
通过研究Valsalva动作、肌肉大小和力量、收缩力、收缩类型（向心、等长、离心）、关节角度变化和肌肉疲劳对抗阻运动血压反应的影响，直接记录31名健康男性志愿者的肱动脉压。无论肌肉大小或力量的个体差异如何，相同相对强度的举重产生了相似的血压升高。同心，等距，或离心运动在相同的相对强度引起类似的增加，尽管在生产力的差异。在举重中，血压的最大增加发生在对应于力量曲线中最弱点的关节角度处，而最小增加发生在对应于最强点的角度处。在不同关节角度相同相对强度的等距收缩产生相同的血压，尽管在绝对力的生产差异。当受试者试图保持最大等长收缩45秒时，尽管力量明显减少，但血压升高保持不变。因此，血压反应的大小取决于努力或中央命令的程度，而不是实际的力量产生。当所需的力产生超过约80%的最大自主收缩时，不可避免地会进行一次简短的Valsalva动作，该动作会夸大血压的升高。
Brachial arterial pressure was directly recorded in 31 healthy male volunteers through protocols examining the effects of the Valsalva maneuver, muscle size and strength, contraction force, contraction type (concentric, isometric, eccentric), changes in joint angle, and muscle fatigue on the blood pressure response to resistance exercise. Weight lifting at the same relative intensity produced similar increases in blood pressure, regardless of individual differences in muscle size or strength. Concentric, isometric, or eccentric exercise at the same relative intensity caused similar increases despite differences in force production. In weight lifting, the greatest increase in blood pressure occurred at the joint angle corresponding to the weakest point in the strength curve and the least at the angle corresponding to the strongest point. Isometric contractions of the same relative intensity at different joint angles produced identical blood pressures despite differences in absolute force production. When subjects attempted to maintain a maximum isometric contraction for 45 s, the blood pressure increase remained the same despite a marked diminution in force. Thus the magnitude of the blood pressure response depends on the degree of effort or central command and not actual force production. A brief Valsalva maneuver, which exaggerates the increase in blood pressure, is unavoidable when desired force production exceeds approximately 80% maximum voluntary contraction.