Posttetanic Potentiation in Knee Extensors after High-Frequency Submaximal Percutaneous Electrical Stimulation

in Journal of Sport Rehabilitation
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Context:

The understanding of posttetanic potentiation (PTP) in human muscles induced by percutaneous electrical stimulation (PES) is important for effective application of electrical stimulation in rehabilitation.

Objective:

To examine the effect of 7-second high-frequency (100-Hz) submaximal (25% of maximal voluntary contraction force) direct PES on contractile characteristics of the knee-extensor (KE) muscles.

Design:

Single-group repeated measures.

Setting:

Kinesiology laboratory.

Subjects:

13 healthy men age 18–27 years.

Measurement:

Peak force (PF), maximal rates of force development (RFD) and relaxation (RR) of supramaximal twitch, and PF of doublet and 10-Hz tetanic contractions before and after direct tetanic PES.

Results:

A significant potentiation of twitch, doublet, and 10-Hz tetanic-contraction PF has been observed at 1–5 minutes posttetanic. Twitch RFD and RR were markedly potentiated throughout the 10-minute posttetanic period.

Conclusions:

A brief high-frequency submaximal tetanic PES induces PTP in KE muscles associated with small increase at 1–5 minutes.

Requena is with the Dept of Physical Education and Sport, University of Granada, Granada, Spain. Ereline, Gapeyeva, and Pääsuke are with the Institute of Exercise Biology and Physiotherapy, University of Tartu, Tartu 51014 Estonia.