Article

OBJECTIVES: To determine inter- and intra-tester reliability of strength
measurements during maximal electrically induced contractions (MEIC) using a
hand-held dynamometer (HHD). METHODS: Thirty-seven healthy young female adults,
mean age (SD) 23.4 (2.4) years, were tested by two examiners during two sessions,
with order of examiners randomized. Biphasic pulses (phase duration--300 micros;
pulse frequency--75 Hz) were employed in order to induce contractions of the
quadriceps femoris muscle at a maximally tolerated current level. Strength of
maximal voluntary isometric contractions (MVIC) and of MEIC was recorded with a
HHD utilizing a stabilization belt. RESULTS: Good to excellent inter- and
intra-tester reliability were determined with intra-class correlation
coefficients ranging between 0.8 and 0.9, and no bias in the Bland-Altman plots.
The 95% repeatability ranged between 8.7 and 13.0 kg for the MVIC and MEIC, and
between 20.7 and 25.6% for the % MVIC. CONCLUSION: Our results confirm previous
findings indicating good to excellent reliability of quadriceps femoris muscle
MVIC assessment with a HHD. However, a high 95% repeatability range indicates the
HHD is not sufficiently reliable as an indicator of the force level attained
during electrically induced contractions. Other methods need to be investigated
to assist in determining whether MEIC have reached therapeutic levels.

Langue : ANGLAIS