Faculty Collaboration Database

Fatigue analysis before and after shaker exercise: physiologic tool for exercise design. Dysphagia 2008 Dec;23(4):385-91

Date

03/29/2008

Pubmed ID

18369673

Pubmed Central ID

PMC4811359

DOI

10.1007/s00455-008-9155-2

Scopus ID

2-s2.0-56349170168 (requires institutional sign-in at Scopus site)   35 Citations

Abstract

Recent studies suggest that the Shaker exercise induces fatigue in the upper esophageal sphincter (UES) opening muscles and sternocleidomastoid (SCM), with the SCMs fatiguing earliest. The aim of this study was to measure fatigue induced by the isometric portion of the Shaker exercise by measuring the rate of change in the median frequency (MF rate) of the power spectral density (PSD) function, which is interpreted as proportional to the rate of fatigue, from surface electromyography (EMG) of suprahyoid (SHM), infrahyoid (IHM), and SCM. EMG data compared fatigue-related changes from 20-, 40-, and 60-s isometric hold durations of the Shaker exercise. We found that fatigue-related changes were manifested during the 20-s hold. The findings confirm that the SCM fatigues initially and as fast as or faster than the SHM and IHM. In addition, upon completion of the exercise protocol, the SCM had a decreased MF rate, implying improved fatigue resistance, while the SHM and IHM showed increased MF rates, implying that these muscles increased their fatiguing effort. We conclude that the Shaker exercise initially leads to increased fatigue resistance of the SCM, after which the exercise loads the less fatigue-resistant SHM and IHM, potentiating the therapeutic effect of the Shaker exercise regimen with continued exercise performance.

Author List

White KT, Easterling C, Roberts N, Wertsch J, Shaker R

Author

Reza Shaker MD Assoc Provost, Sr Assoc Dean, Ctr Dir, Chief, Prof in the Medicine department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Aged
Deglutition
Deglutition Disorders
Electromyography
Exercise
Female
Humans
Isotonic Contraction
Male
Muscle Fatigue
Risk Factors
Time Factors