Impact of the COVID-19 lockdown on physical fitness among college women living in China

Figures & data

Figure 1. Study Sample Flowchart.

Table 1. The baseline characteristics of the sample in 2019 year.

	BMI Quartiles				Total	p
	Quartile 1 (0–25%)	Quartile 2 (25–50%)	Quartile 3 (50-–5%)	Quartile 4 (75–100%)
N (%)	884 (25%)	885 (25%)	884 (25%)	885 (25%)	3538
Age (year), mean (SD)	19.29 (1.13)	19.24 (1.06)	19.12 (1.08)	18.97 (1.01)	19.15 (1.08)	<0.001
Height (cm), mean (SD)	163.83 (5.89)	163.85 (5.89)	164.17(5.82)	165.16 (5.55)	164.25 (5.81)	<0.001
Weight (kg), mean (SD)	65.59 (8.34)	56.62 (4.27)	52.69 (3.92)	48.54 (3.89)	55.86 (8.32)	<0.001

Table 2. College women’s mean level of fitness pre and post the COVID-19 lockdown by different physical condition.

Types of Fitness Testing	Quartiles				F	p
	Quartile 1 (0--25%)	Quartile 2 (25–50%)	Quartile 3 (50–75%)	Quartile 4 (75–100%)
BMI, mean (SD)
N	756	789	780	818
2019 year (kg/m^2)	24.32(2.29)	21.05(0.50)	19.52(0.42)	17.78(0.81)	2237.51	<0.001
2020 year (kg/m^2)	24.55(2.79)	21.41(1.30)	20.05(1.20)	18.43(1.17)
800 m running, mean (SD)
N	874	872	860	904
2019 year (min:sec)	4:26 (0:22)	4:00 (0:03)	3:47 (0:04)	3:29 (0:11)	1075.30	<0.001
2020 year (min:sec)	4:43 (0:39)	4:18 (0:21)	4:05 (0:20)	3:50 (0:27)
Sit-up, mean (SD)
N	983	905	1185	548
2019 year (repetitions)	30.05 (5.56)	40.64 (2.17)	48.41 (1.92)	54.53 (3.66)	1216.31	<0.001
2020 year (repetitions)	33.36 (10.07)	38.61 (8.39)	43.14 (8.12)	46.83 (6.87)

Table 3. Paired t-test results of physical fitness testing in 2019 year and 2020 year.

fitness test change (2020–2019)	Paired difference mean (95% CI)	Performance (%)	Effect size (95% CI)	t
BMI (kg/m^2)
Quartile 1 (75–100%)	0.24 (0.12, 0.35)	0.98↑	0.15 (0.08, 0.22)	4.12***
Quartile 2 (50–75%)	0.36 (0.28, 0.45)	1.73↑	0.30 (0.23, 0.37)	8.46***
Quartile 3 (25–50%)	0.53 (0.45, 0.51)	2.72↑	0.47 (0.40, 0.55)	13.22***
Quartile 4 (0–25%)	0.66 (0.59, 0.72)	3.69↑	0.69 (0.61, 0.76)	19.64***
Total	0.45 (0.41, 0.49)	2.91↑	0.36 (0.33, 0.40)	20.32***
800 m running (sec)
Quartile 1 (0-25%)	19.45 (16.83, 22.15)	7.37↓	0.55 (0.47, 0.63)	14.40***
Quartile 2 (25-50%)	18.37 (16.67, 19.97)	7.65↓	0.90 (0.81, 0.98)	24.70***
Quartile 3 (50-75%)	17.04 (15.72, 18.40)	7.49↓	0.88 (0.80, 0.96)	24.70***
Quartile 4 (75-100%)	19.60 (18.00, 21.46)	9.32↓	0.77 (0.69, 0.84)	21.91***
total	18.66 (17.77, 19.56)	7.97↓	0.73 (0.69, 0.77)	39.77***
sit-up (repetitions)
Quartile 1 (0–25%)	3.28 (2.65, 3.92)	10.91↑	0.33 (0.26, 0.39)	10.07***
Quartile 2 (25–50%)	−2.03 (−2.55, −1.46)	5.00↓	−0.24 (−0.31, −0.18)	−7.19***
Quartile 3 (50–75%)	−5.26 (−5.77, −4.85)	10.87↓	−0.66 (−0.73, −0.60)	22.31***
Quartile 4 (75–100%)	−7.55 (−8.18, −6.91)	13.88↓	−1.10 (−1.21, −0.99)	24.58***
total	−2.09 (−2.43, −1.77)	4.91↓	−0.23 (−0.27, −0.19)	−12.63***

Notes: ***p < 0.001; ↑increase; ↓decrease.

Figure 2. College women’s mean level of BMI pre and post the COVID-19 lockdown by different physical condition. ***p < 0.001.

Figure 3. College women’s mean level of 800 m running pre and post the COVID-19 lockdown by different physical condition. ***p < 0.001.

Figure 4. College women’s mean level of sit-up pre and post the COVID-19 lockdown by different physical condition. ***p < 0.001.

Data availability Statement

The datasets generated and/or analyzed during the current study are not publicly available due to confidentially reasons, but are available from the corresponding author on reasonable request.