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High frequency fatigue appearing after maximal hopping

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

Sažetak

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.

Ključne riječi

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

Hrčak ID:

225203

URI

https://hrcak.srce.hr/225203

Datum izdavanja:

1.12.2001.

Podaci na drugim jezicima: hrvatski

Posjeta: 749 *