Mf. Reneman et al., Measuring maximum holding times and perception of static elevated work andforward bending in healthy young adults, J OCCUP REH, 11(2), 2001, pp. 87-97
The objectives of this study were to investigate the maximum holding times
(MHT) of two highly stressful postures: standing in a forward bend position
and performing elevated work in a standing position. The relationship betw
een perceived exertion and MHT Was also studied. Subjects were 44 young adu
lts, age 20-29 years (25 female, 19 male). A test-retest design was used to
establish reliability. Mean maximum holding times for forward bending and
elevated work were respectively 14.51 and 16.18 min with large interindivid
ual variations. A logarithmic rather than a linear relation between perceiv
ed exertion and performance is found. It is not possible to reliably predic
t MHTs from subjective data. Test-retest correlation is high (n = 19, r = 0
.716 and 0.813, p < 0.001), and the scores did not differ significantly (p
< 0.005), indicating a reliable procedure. The average holding times of the
population studied are higher than expected from literature. Neither gener
ic formulas, curve estimations, or predictions can reliably predict an indi
vidual's MHT. An individual's MHTs are best tested through performance base
d testing.