NDLI: Beneficial effects of serial contractions on muscle performance after a brief period of rest

Content Provider	Springer Nature Link
Author	Green, Lara A. Parro, Justin J. Gabriel, David A.
Copyright Year	2014
Abstract	The study investigated potential mechanisms underlying the beneficial effects of performing serial contractions for increasing muscle performance.Thirteen men performed maximal isometric dorsiflexion contractions to a limited amount of fatigue. The recovery pattern was monitored over 15 min. Force, surface electromyography (sEMG) of the agonist and antagonist, and skin temperature were observed. Evoked potentials were elicited.Force decreased to 206 ± 40 N and recovered to 243 ± 55 N (102 % of initial value). While full recovery is noteworthy, it was not significant (p = 0.24). Surface EMG root-mean-square (RMS) amplitude did not fully recover: tibialis anterior (219 ± 46 versus 242 ± 63 μV, 91 %) and soleus (13 ± 5 versus 16 ± 6 μV, 82 %). The result was an 11 % decrease in the co-activation ratio during recovery. Tibialis anterior and soleus mean power frequency (MPF) “over-recovered” to 117 % (144 ± 25 versus 124 ± 27 Hz) and 118 % (80 ± 14 versus 68 ± 11 Hz) of initial value, respectively. Peak rate of force development (RFD) during recovery was 146 % of initial (743 ± 246 versus 509 ± 271 N). Skin temperature increased 0.6 °C over the test session. Potentiation was not present during recovery, as assessed by twitch force.The return of force to initial values, rather than a persistent decrement was a result of several mechanisms operating simultaneously. The sEMG data indicate an increase in conduction velocity, while an increase in peak RFD suggests contraction-induced facilitation of ATPase pump activity. However, alterations in muscle coordination were observed as a reduction in antagonist co-activity.
Starting Page	1657
Ending Page	1665
Page Count	9
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	114
Issue Number	8
e-ISSN	14396327
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-05-11
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Isometric dorsiflexion force Tibialis anterior Surface electromyography Warm-up effect Muscle coordination Antagonist co-activation Human Physiology Occupational Medicine/Industrial Medicine Sports Medicine
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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