Table 2.

Lateral abdominal muscle length and thickness during each condition

Variable	Hypermobile (n=12)			Control (n=12)
	Rest	Contraction	Change	Rest	Contraction	Change
Transversus abdominis length, cm
AvLx	6.97 (1.76)	5.66 (1.66)‡	−19%	6.76 (1.81)	5.09 (1.81)‡	−25%
L1	7.63 (1.88)	6.56 (1.66)‡	−14%	7.28 (1.91)	5.81 (1.87)‡	−20%
L3	6.95 (1.52)	5.56 (1.33)‡	−20%	6.81 (1.89)	4.94 (1.72)‡	−29%
L5	6.31 (1.66)	4.85 (1.54)‡	−23%	6.21 (1.48)	4.53 (1.62)‡	−27%
Transversus abdominis thickness, cm
AvLx	0.38 (0.10)	0.54 (0.17)‡	42%	0.40 (0.10)	0.57 (0.15)‡	43%
L1	0.40 (0.11)	0.56 (0.17)‡	40%	0.44 (0.10)	0.59 (0.16)‡	34%
L3	0.39 (0.10)	0.54 (0.15)‡	38%	0.39 (0.10)	0.56 (0.14)‡	44%
L5	0.35 (0.08)	0.51 (0.19)‡	46%	0.38 (0.10)	0.55 (0.15)‡	45%
External abdominal oblique thickness, cm
AvLx	0.68 (0.20)	0.64 (0.20)‡	−5.9%	0.60 (0.13)	0.58 (0.14)*	−3.3%
L1	0.66 (0.24)	0.67 (0.22)	1.5%	0.59 (0.13)	0.59 (0.12)	0.0%
L3	0.72 (0.19)	0.66 (0.18)‡	−8.3%	0.61 (0.13)	0.61 (0.14)	0.0%
L5	0.66 (0.17)	0.59 (0.20)‡	−11%	0.60 (0.13)	0.53 (0.14)‡	−12%
Internal abdominal oblique thickness, cm
AvLx	0.75 (0.18)	0.90 (0.26)‡	20%	0.71 (0.21)	0.83 (0.24)‡	17%
L1	0.71 (0.18)	0.79 (0.24)†	11%	0.62 (0.15)	0.66 (0.18)*	6.5%
L3	0.76 (0.16)	0.91 (0.24)‡	20%	0.70 (0.20)	0.84 (0.17)‡	20%
L5	0.79 (0.19)	0.99 (0.28)‡	25%	0.80 (0.23)	0.98 (0.26)‡	23%

Data are unadjusted mean (SD). AvLx: average of L1–L5. *p<0.05, †p<0.01, ‡p<0.001 compared with rest within-group (condition).