Original scientific paper

High frequency fatigue appearing after maximal hopping

Blaž Jereb ; Faculty of Sport, University Ljubljana
Vojko Strojnik ; Faculty of Sport, University Ljubljana

Abstract

Neuromuscular fatigue after stretch-shortening cycle (SSC) exercise was analysed. Eleven healthy sport students performed maximal hops for 60 secs on a force plate. After the workout, a statistically significant increase in the blood lactate concentration was found (before workout 0.73 mmol/l, three minutes after workout 6.41 mmol/l, (P<0.001)). During the hopping, maximal height was decreased for 3 cm (P<0.002). Contact times were shortened statistically significant, too (P<0.001). There were no statistically significantly changes in power or in fatigue index. Electrical stimulation of the vastus lateralis muscle resulted in a decreased twitch force (12%), contraction time and half relaxation timewere also shorter, but the changes were not statistically significant. Torque during 20 Hz stimulation showed a trend of increase. Torque during 100 Hz stimulation was significantly lower (P<0.001). Results showed that a high frequency fatigue was present after the hopping, noting that fatigue appeared in the conductory part of the muscle while the muscle contractile activity was not impaired.

Keywords

neuromuscular fatigue; stretch-shortening cycle (SSC) exercise; electrical stimulation

Hrčak ID:

225203

URI

https://hrcak.srce.hr/225203

Publication date:

1.12.2001.

Article data in other languages: croatian

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