Table 2.

Ranking of Activities That Caused Maximum Load-to-Strength Ratios and the Percentage of Subjects for Which the Activity Solved

Rank	Activity no.	% Subjects solved	Activity description	Percentage of levels at which it causes maximum load-to-strength ratio
1	19	78%	75° of trunk flexion with 10 kg weights in each hand	26.64%
2	11	29%	90° trunk flexion with 10 kg weights in each hand	21.61%
3	9	100%	Standing, 10 kg weights in each hand, elbows flexed to 90°	17.92%
4	15	90%	Standing, 10 kg weight in each hand, elbows flexed to 90°, 30° trunk axial twist	14.37%
5	16	86%	20° trunk lateral bend to the right, with 20 kg in right hand	8.77%
6	61	99%	60° trunk flexion, 5 kg in each hand	2.39%
7	118	99%	Sit-up exertion—supine position	2.03%
8	116	96%	Upright standing, arms pushing down, shoulders flexed 130°	1.05%
9	73	84%	60° trunk flexion +30° axial twist, 5 kg in each hand	1.00%
10	107	94%	Pushing down, arms at side	0.92%
11	114	3%	Pushing forward, shoulders flexed 130°	0.49%
12a	119	100%	Sit-up exertion, 25° flexion at pelvis	0.49%
13	5	93%	90° trunk flexion, arms hanging down	0.42%
14a	25	93%	90° of flexion all in lumbar spine (pelvis upright)	0.42%
15	44	87%	60° shoulder flexion, 5 kg in each hand	0.40%
16	32	2%	Shoulder flexion 90°, right arm	0.25%
17	14	88%	Trunk axial twist and trunk flexion, each at 30° with 10 kg weight	0.21%
18	52	49%	60° shoulder abduction 5 kg in each hand	0.12%
19	8	100%	Standing, 20 kg weights in each hand at the side	0.09%
20a	20	100%	Opening window with both hands (15 N)	0.09%
21a	105	81%	Pushing forward, arms at side	0.09%
22	17	95%	Standing, 20 kg weight in right hand	0.06%
23a	113	68%	Pushing down, shoulders flexed 130°	0.06%
24	7	96%	Standing, 20 kg weight in left hand at the side	0.03%
25a	109	91%	Pulling back, shoulders flexed 30°	0.03%
26a	111	98%	Pushing forward, shoulders flexed 130° (49 N)	0.03%

^aIndicates equal importance as previous activity.