Effects of Chronobiological Variation on Speed and Accuracy of Repost-Lunge from Parry-Four Position in Foil and variables of core body temperature and heart rate behind the Anaerobic Threshold

. . . . . . . . () () . . .The importance of this research laid in being acquainted with the Effects of chronobiological variation on some components of performance in the foil after experiencing a high intensity effort. So, the problem aroused from the nature of skill responses which may occurs during a physical effort at deferent chronobiological variations. The research aimed at being acquainted with the Effects of the morning and late afternoon chronobiological variations on the absolute change values of speed and accuracy of repost-lunge from parry-four position in foil behind the anaerobic threshold in addition to physiological variables such as heart rate and core body temperature. The research also aimed at being acquainted with the direction of relation between the values of studied variables at rest with their correspondences at absolute change. In addition to the relation between the core body temperature as chronobiological indicator and speed, accuracy of four parry lunge and heart rate for morning and late afternoon variations. The sample included students practicing fencing as credit at the third academic class in the college of physical education. The final experiment included the morning test of speed and accuracy of the repost-lunge from parry-four position and the physiological variables. After that, the effort on ergometer was applied so that the test of speed and accuracy of the repost-lunge from parry-four position to be applied again. The same procedures were conducted after a week for the late afternoon test. The arithmetic mean, standard deviation, absolute change equation, relative change equation, paired "t" test and simple correlation were used to analyze the data statistically.The research concluded that the chronobiological variation has an effect on increasing the speed of lunge of repost from Parry-Four position as a skill after effort at anaerobic threshold. The responses of all variables, excluding the late afternoon central body temperature are independent from chronobiological variations through the day. Some biological rhythm may relate in a part to the central body temperature as an indicator of biological rhythm inside the body, but that is not a rule since they may also be affected by other factors.