Abstract
Research background and hypothesis. Prior eccentric or eccentric-concentric exercise induces long lasting muscle fatigue and delayed onset muscle soreness (DOMS). Moreover, the surface electromyograme sEMG amplitude increases under fatigue conditions. We suppose that prior eccentric – concentric exercise, inducing DOMS, increases EMG amplitude of thigh muscles during constant cycling exercises.Research aim of the study was to assess the residual effect of 100 prior drop jumps (PDJ) on the sEMG of m. vastus lateralis and m. vastus medialis during moderate and heavy intensity cycling exercises. Research methods. On four different days 10 female students performed one increasing and three (control, 45 min and 24 h after 100 drop jumps) moderate and heavy cycling (Ergoline-800, Germany) exercises. The cadence of cycling was 70 rpm. The sEMG of right thigh m. vastus lateralis and m. vastus medialis were continuously recorded during moderate and heavy cycling exercise. Creatine kinasis activity was measured and DOMS was rated 24 h after PDJ. Research results. After 24 h the subjects felt moderate DOMS (5.0 (2.79)) according to 10 point scale. The sEMG root mean square amplitude of m. vastus lateralis significantly increased 24 h after PDJ during moderate, but unaltered during heavy cycling exercise under fatigue conditions (45 min and 24 h after PDJ).Discussion and conclusion. Prior drop jumps seem to have significant residual (within 24 h of recovery) effect on EMG of thigh muscles during moderate cycling exercise in female students.Keywords: delayed onset muscle soreness, constant load, EMG root mean square.
Highlights
Repeated eccentric muscle actions, during which the muscle lengthens during action, are known to induce delayed onset muscle soreness (DOMS), which is first felt 6–10 hours post exercise and peaks between 24 and 48 h post exercise (Gleeson et al, 1995)
The root mean square (RMS) of m. vastus lateralis (mVL) (Figure 1) significantly increased 24 h prior drop jumps (PDJ) compared with CON (p = 0.03) during MCE with no changes in m. vastus medialis (mVM) (Figure 2)
No significant differences in RMS of mVL (Figure 3) and mVM (Figure 4) were observed during HCE between CON, 45 minutes after prior drop jumps (45’PDJ) and 24 hour after PDJ (24h PDJ), but RMS of mVL statistically increased minute 5 compared with minute 1 (p = 0.02) and minute 2 (p = 0.03) under CON (Figure 2)
Summary
Repeated eccentric muscle actions, during which the muscle lengthens during action, are known to induce delayed onset muscle soreness (DOMS), which is first felt 6–10 hours post exercise and peaks between 24 and 48 h post exercise (Gleeson et al, 1995). Associates with eccentric exercise induced DOMS are evidence of muscle fibres disarrangement (Hortobagy et al, 1996; Stupka et al, 2001; Laanksonen et al, 2006; Malm, Yu, 2012), increased serum creatine kinase (CK) activity (Gleeson et al, 1995; Stupka et al, 2000; Chen et al, 2010; Skurvydas et al, 2010), decreased muscle force production (Chen et al, 2010; Laanksonen et al, 2006; Semmler et al, 2007; Skurvydas et al, 2010) and decreased cycling performance efficiency (Horita et al, 2003; Moysi et al, 2005). We have not found data about the residual effect of DOMS induced eccentric exercise on EMG during dynamic exercise
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