Reliability of a Test for Assessment of Isometric Trunk Muscle Strength in Elderly Women

Table 1

Values of the isometric dynamometry tests of back muscle extensors and flexors, between days 1 and 2 (), followed by ICC, CV, SEM, and MDD values.

Variables	Day 1	Day 2	Days 1 and 2
	Mean ± SD	Mean ± SD	ICC	CV	SEM	MDD
Extensors	281.7 ± 69.7 N (250.0–313.4)	281.8 ± 73.3 N (248.4–315.2)	0.93	8.9%	18.4	51.1
Flexors	271.0 ± 47.2 N (249.6–292.6)	266.0 ± 46.6 N (244.9–287.3)	0.86	8.9%	17.6	48.9

Data are expressed as mean ± standard deviation (SD). N: newton; ICC: interclass correlation coefficient; CV: coefficient of variation in %; SEM: standard error of measurement in newton; MDD: minimum detectable difference in newton. The values of 95% confidence interval (lower-upper) are shown in parentheses.