Stafford D E, Petrofsky J S
J Appl Physiol Respir Environ Exerc Physiol. 1981 Aug;51(2):399-404. doi: 10.1152/jappl.1981.51.2.399.
Isometric contractions of the handgrip muscles were exerted by eight male subjects (age range 19-24 yr) to determine the relationship between fatiguing and nonfatiguing isometric contractions. In a first series of experiments, subjects exerted fatiguing isometric contractions at tensions of 25, 40, or 70% of the maximum strength of the subjects (MVC) following a contraction at a nonfatiguing tension of 5 or 10% MVC for 3, 7, or 20 min. In a second series of experiments, subjects exerted pairs of fatiguing isometric contractions at the same tensions; however, during the 3-, 7-, or 20-min interval between the contractions the subjects either rested or exerted a contraction at 5 or 10% MVC. Nonfatiguing isometric contractions exerted prior to fatiguing contractions had little influence on the endurance for the fatiguing static effort. In contrast, when contractions at nonfatiguing tensions were exerted in the recovery interval following an isometric contraction at a fatiguing tension, the recovery of endurance was dramatically reduced.
八名男性受试者（年龄范围19 - 24岁）进行了握力肌的等长收缩，以确定疲劳性和非疲劳性等长收缩之间的关系。在第一组实验中，受试者在以5%或10%最大自主收缩强度（MVC）进行3、7或20分钟的非疲劳性收缩后，分别以25%、40%或70%最大自主收缩强度进行疲劳性等长收缩。在第二组实验中，受试者以相同强度进行成对的疲劳性等长收缩；然而，在两次收缩之间的3、7或20分钟间隔内，受试者要么休息，要么以5%或10%最大自主收缩强度进行收缩。在疲劳性收缩之前进行的非疲劳性等长收缩对疲劳性静态用力的耐力影响很小。相反，当在疲劳性强度的等长收缩后的恢复间隔内进行非疲劳性强度的收缩时，耐力的恢复会显著降低。
