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The aim of the present study was to establish the infl uence of muscle heating and cooling on kneefl exors and extensors, during fatiguing exercise and recovery. The participants of the study were 10 healthy male, age: 19—23 years; height — 177.8 ± 5.8; weight — 78.2 ± 6.1, with no history of knee ligament. The study was performed in the human motoric laboratory of Lithuanian Academy of Physical Education in year 2005 / 2006. All the subjects have done non-stop 50 repetitions of knee fl exion and extension at 450 / s range motion on “Biodex System Pro 3” device (fi rst experiment) and the same isokinetic exercise was repeated after the quadriceps muscle had been heated (second experiment) and had been cooled (third experiment). Before (pre-exercise), ten minutes (post-exercise), 30 min, 1 hours 10 min and 24 hours after the fatiguing exercise, three knee extensions / fl exions with angular velocity of 450o / s were performed. A blood lactate sample was taken before initial measurements and following exercise at 5 and 30 minutes. The increase of CK and muscle pain 24 hours after the fatiguing exercise. After individual analysis of values, it was found, that muscle heating or cooling before the exercise had no effect on muscle recovery time. Power in max speed was declined (A 0): knee extension normal muscle temperature — 18.1 ± 14.2 N·m, heating muscle temperature — 19.9 ± 14.3 N·m, cooling muscle — 20.8 ± 9.2 N·m; knee fl exion normal muscle temperature — 9.0 ± 7.2 N·m, heating muscle temperature — 8.3 ± 9.0 N·m, cooling muscle — 5.8 ± 5.2 N·m (p < 0.05). Power in max speed declined: knee extension ~ 80%, fl exion ~ 85%. The evidence obtained in this study showed that, muscle heating or cooling before exercise didn’t decrease power in max speed of knee extensors and fl exors. Muscle heating or cooling before the exercise had no effect on muscle recovery time, however increased a post-exercise blood lactate value. After 24 hours the CK in muscles was increased.

Skirtingos temperatūros poveikis kelio tiesiamųjų ir lenkiamųjų raumenų nuovargiui ir atsigavimui