Isometric Strength Database for Muscle Maximal Voluntary Endurance Field Tests: Normative Data

Sports Medicine - Open

Table 8 Male performance prediction equations for all isometric tests

Muscle endurance tests	Predictive Equations	R²
Trunk flexor muscles	−10.92 − 1.18 × (age; years)^* − 0.87 × (weight; kg)^* + 1.41 × (height; cm)^**	0.200
Back extensor muscles	112.42 − 1.89 × (age; years)^* − 1.10 × (weight; kg)^ + 1.32 × (height; cm)^*	0.195
Right quadratus lumborum muscles	17.44 − 1.13 × (age; years)^* − 0.78 × (weight; kg)^* + 0.94 × (height; cm)^**	0.294
Left quadratus lumborum muscles	35.49 − 1.11 × (age; years)^* − 0.87 × (weight; kg) ^* + 0.89 × (height; cm)^**	0.342
Quadriceps muscles	−9.59 − 0.60 × (age; years)^* − 0.49 × (weight; kg)^ + 0.87 × (height; cm)^**	0.157
Hamstrings muscles	35.17 − 1.66 × (age; years)^* − 1.33 × (weight; kg)^* + 2.14 × (height; cm)^**	0.168
Back muscles	125.19 − 1.94 × (age; years)^* − 0.84 × (weight; kg)^ + 1.15 × (height; cm)^*	0.225
Chest muscles	38.76 − 0.64 × (age; years)^* − 0.41 × (weight; kg)^* + 0.48 × (height; cm)^**	0.284

kg kilograms, cm centimeter; *p < 0.05; **p < 0.01; ***p < 0.001
Interpretation. The expected holding time for maximal endurance trunk flexor test for a 51-year man with height of 184 cm and a weight of 97 kg is: −10.92 − (1.18 × 51) − (0.87 × 97) + (1.41 × 184) = 103.95 s.