One way of arriving at
an acceptable percentage of error is to decide whether the vari-
ability associated with a particular measurement is small enough to
allow the detection of the expected changes with training. Rec-
reationally active young adults undergoing 4 weeks of flexibility
training have shown gains in hamstring flexibility (measured
through PSLR and SRT) between 9.3% and 24.4% (Davis et al., 2005;
Provance et al., 2006; Sainz de Baranda & Ayala, 2010; Sainz de
Baranda et al., 2006). Consequently, it would appear that the
errors associated with PSLR (5.46%), SRT (8.74%) and TT test (9.86%)
are narrow enough to detect the expected changes in muscle
flexibility with stretching training.