The 6-minute pegboard and ring test is correlated with upper extremity activity of daily living in chronic obstructive pulmonary disease

Figures & data

Table 1 Subject characteristics

Variables (n = 20)
Males/females, n	18/2
Age, years	76 (59–85)
BMI, kg/m^2	20.0 ± 3.3
GOLD stage: (n)	1: 4 2: 6 3: 9 4: 1
MRC dyspnea scale score: (n)	0: 3 1: 1 2: 5 3: 8 4: 3
VC, L	2.99 ± 0.7
VC predicted, %	93.3 ± 9.1
IC, L	1.83 ± 0.5
IC/TLC predicted, %	30 ± 8.0
FVC, L	2.80 ± 0.7
FVC predicted, %	88.2 ± 17.5
FEV1, L	1.31 ± 0.6
FEV1 predicted, %	51.0 ± 20.7
FEV1/FVC	45.7 ± 12.7
PImax, cmH2O	48.5 ± 18.6
PImax predicted, %	77.9 ± 30.5
PEmax, cmH2O	77.4 ± 33.5
PEmax predicted, %	88.1 ± 38.3
Grip strength, kg	26.2 ± 5.6

Note: The values shown represent the mean ± standard deviation or median (range), unless otherwise indicated.

Abbreviations: n, number; BMI, body mass index; GOLD, global initiative for chronic Obstructive Lung Disease; MRC, Medical Research Council; VC, vital capacity; IC, inspiratory capacity; TLC, total lung capacity; FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 second; PI_max, maximal inspiratory pressure; PE_max, maximal expiratory pressure; L, lung.

Table 2 6PBRT score and upper extremity physical activity

6PBRT score	274 ± 91
	Before the test	After the test
SpO2	96 (93–98)	95 (81–99)
Borg scale	–	4 (0.5–7.0)
Upper extremity physical activities
Actiwatch 2® counts	193 × 10^3 ± 102 × 10^3
PFSDQ-M subdomain score	2 (0–29)

Note: The values shown represent the mean ± standard deviation or median (range).

Abbreviations: 6PBRT, 6-minute pegboard and ring test; PFSDQ-M, modified Pulmonary Functional Status and Dyspnea Questionnaire.

Table 3 Correlation between 6PBRT score and pulmonary function, PI_max, PE_max, and grip strength

	r*	P-value
VC, L	0.52	<0.05
VC predicted, %	0.38	NS
IC, L	0.71	<0.001
IC/TLC predicted, %	0.68	<0.01
FVC, L	0.57	<0.01
FVC predicted, %	0.43	NS
FEV1, L	0.39	NS
FEV1 predicted, %	0.31	NS
FEV1/FVC	0.14	NS
PImax, cmH2O	0.36	NS
PImax predicted, %	0.31	NS
PEmax, cmH2O	0.16	NS
PEmax predicted, %	0.21	NS
Grip strength, kg	0.24	NS

Note:

* Pearson’s product moment correlation coefficient.

Abbreviations: 6PBRT, 6-minute pegboard and ring test; PI_max, maximal inspiratory pressure; PE_max, maximal expiratory pressure; VC, vital capacity; NS, not significant; IC, inspiratory capacity; TLC, total lung capacity; FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 second; L, lung.

Table 4 Correlation of 6PBRT score and upper extremity physical activity

	ρ (r)	P-value
PFSDQ-M subdomain score	−0.49*	<0.05
Actiwatch 2® counts	0.54†	<0.05

Notes:

* Spearman’s rank correlation coefficient (ρ);

† Pearson’s product moment correlation coefficient (r).

Abbreviations: 6PBRT, 6-minute pegboard and ring test; PFSDQ-M, modified Pulmonary Functional Status and Dyspnea Questionnaire.

Figure 1 Correlation of 6PBRT score with inspiratory capacity and with inspiratory capacity/total lung capacity predicted.

Note: (A) The correlation between 6PBRT and IC (0.71) was stasticially significant at P<0.0005. (B) The correlation between 6PBRT and IC/TLC predicted (0.68) wasstatistically significant at P<0.001.
Abbreviations: 6PBRT, 6-minute pegboard and ring test; IC, inspiratory capacity; TLC, total lung capacity.