TABLE 1.

Elastic constants for Theraband elastic bands.

Band color	Elastic constant	SE*	R 2*	r* between AGUEDA measurements
Yellow band
AGUEDA* elastic constant	kg = 0.017 · P	0.0007	0.981	0.9999
Theraband reference elastic constant a	kg = 0.009 · P	0.0003	0.995
Red band
AGUEDA elastic constant	kg = 0.021 · P	0.0007	0.988	0.9997
Theraband reference elastic constant	kg = 0.011 · P	0.0004	0.986
Green band
AGUEDA elastic constant	kg = 0.030 · P	0.0013	0.979	0.9994
Theraband reference elastic constant	kg = 0.015 · P	0.0004	0.994
Blue band
AGUEDA elastic constant	kg = 0.035 · P	0.0015	0.979	0.9991
Theraband reference elastic constant	kg = 0.020 · P	0.0006	0.993
Black band
AGUEDA elastic constant	kg = 0.042 · P	0.0018	0.977	0.9988
Theraband reference elastic constant	kg = 0.027 · P	0.0011	0.986
Silver band
AGUEDA elastic constant	kg = 0.060 · P	0.0024	0.979	0.9986
Theraband reference elastic constant	kg = 0.039 · P	0.0011	0.993
Gold band
AGUEDA elastic constant	kg = 0.069 · P	0.0030	0.978	0.9989
Theraband reference elastic constant	kg = 0.061 · P	0.0020	0.989

Note: Band colors indicate varying intensities, ranging from yellow (representing the lowest intensity) to gold (indicating the highest intensity). The initial equation, F = k · x, is represented as kg = ((elastic constant) ± SE) × percentage of elongation, where kg is the resultant resistance. For instance, when elongation is at 100%, the kg value for the yellow band would be calculated as kg = (0.00017 ± 0.0007) × 100.

Abbreviations: AGUEDA, active gains using exercise during aging; r, coefficient of correlation between the two AGUEDA measurements; R ², coefficient of determination; SE, standard error.

^a Reference values for Theraband elastic bands' resistance across different colors (adapted from Uchida et al. (2016)).