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Table 1 Results of various motor and respiratory function tests at 1 and 4 months after onset of coronavirus disease 2019 infection

From: Rehabilitation therapy for a severe case of coronavirus disease 2019: a case report

Respiratory function tests

T + 1 month

T + 4 months

VC (L)

3.65

4.43

VC (%)

85.0

104.7

FEV1 (%)

89.7

83.3

DLCO (%)

25.0

50.3

Iliopsoas muscle computed tomography

 Body fat percentage (%)

39.2

37.8

 Inner fat rate (%)

39.7

39.8

 Psoas major muscle mass (cm3)

276.4

316.2

 Part of the Psoas major muscle (cm3)

98.9

113.4

Bioelectrical impedance analysisa

 Body weight (kg)

65.7

71.0

 Muscle mass (kg)

46.1

50.1

 Body fat mass (kg)

16.9

18.0

 ECW/TBW whole (body)b

0.394

0.389

 ECW/TBW right armb

0.384

0.379

 ECW/TBW left armb

0.383

0.378

 ECW/TBW right legb

0.400

0.394

 ECW/TBW left legb

0.399

0.394

 ECW/TBW trunk (of the body)b

0.393

0.388

Timed Up and Go test

 Comfortable speed: Clockwise (seconds)

9.0

6.0

 Comfortable speed: Left turn (seconds)

10.5

5.9

 Maximum speed: Clockwise (seconds)

7.0

6.0

 Maximum speed: Left-handed (seconds)

7.4

6.0

Walking for 6 minutes (with mask on)

 Distance walked (m)

383

572

 Modified Borg Scale

Shortness of breath 4/fatigue 4

Shortness of breath 3/fatigue 0

  1. Data are from Kashiwabara, et al. [5] with some modifications, with permission
  2. VC Vital capacity, FEV1 forced expiratory volume in the first second, DLCO diffusing capacity of the lungs for carbon monoxide, ECW extracellular water content, ICW intracellular water content, TBW total body content (= ICW + ECW), T Day patient became febrile (38 °C)
  3. aBioelectrical impedance analysis was performed using an InBody® body composition analyzer (InBody Japan Co., Tokyo, Japan)
  4. bECW/TBW (standard range: 0.360–0.400). In general, a rapid increase in fluid causes an abnormal increase in both ECW and ICW, but the rate of increase in ECW is higher, resulting in a higher ECW/TBW. A decrease in the number of somatic cells that make up the muscle is associated with a decrease in ICW, whereas is ECW/TBW high in the absence of fluid overload