ブリ遊泳時の血合筋と普通筋の筋出力〔英文〕

概要

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Based on electromyograms from the red and white muscles of the yellowtail Seriola quinqueradiata swimming in a water tunnel, the power output of each muscle was estimated. Maximum amplitude (A) and duration (D) of 10-20 consecutive bursts of discharge in the recording were measured at various swimming speeds for 30 fish of circ. 36cm in fork length. The work of a burst was obtained from the product of A×D2, and the power (P) derived from n bursts for a period of T seconds was given by; P∝∑ni=1Ai•Di2/T Power outputs of each muscle obtained from the above expression were then calibrated by the measurement of oxygen consumption. The power output of the red muscle increased with speed to a maximum (75.0×105erg/s/fish) at 99cm/s and then decreased. The white muscles began to work at 65cm/s and their power increased with speed showing a rapid increase above 99cm/s. These two speeds, 65 and 99cm/s, seem to represent critical points of change in muscle power output and are named the "Ignition Point of White muscle" (IPW) and the "Saturation Point of Red muscle" (SPR), respectively. Below IPW, power is supplied only from the red muscle, between IPW and SPR, from both red and white muscles, and over SPR, mainly from the white muscle. The interrelationships between these three ranges and some physiological characteristics of the fish are discussed, e.g., heart rate, fatigue curve, oxygen consumption and lactate accumulation.
日本水産學會の論文