The Impact of Obesity on Back and Core Muscular Endurance in Firefighters

Table 2

Matrix of bivariable Pearson’s correlation coefficient (𝑟) values between selected age, physical exercise, obesity, and muscular endurance data.

	Core; endurance	Age	Any exercise	BMI	Body; Fat %	Fat mass	Fat-free mass
Back endurance	0.36^b	−0.22^a	NS	−0.44^b	−0.45^b	−0.46^b	−0.15
Core endurance	1.00	NS	NS	−0.47^b	−0.52^b	−0.55^b	−0.26^a
Age		1.00	NS	0.34^b	0.37^b	0.32^b	−0.06
Any exercise			1.00	−0.25^a	−0.33^b	−0.28^b	0.09
BMI				1.00	0.77^b	0.85^b	0.45^b
Body fat %					1.00	0.96^b	0.02
Fat mass						1.00	0.28^a
Fat-free mass							1.00

Key: ^a𝑃≤0.05; ^b𝑃≤0.01.
Any exercise: self-reported days per week of any physical exercise over the past three months; back endurance: back muscular endurance assessed with the modified Biering Sorensen test(s); core endurance: core muscular endurance assessed with the Plank test(s); BMI: body mass index; NS: not significant.