Pain severity is associated with muscle strength and peak oxygen uptake in adults with fibromyalgia

Figures & data

Table 1 Demographic and clinical characteristics

Characteristic*	(N=69)
Sex (N, %)
Female	63 (91.3)
Male	6 (8.7)
Age (mean ± SD)	46.7±10.5
Ethnicity
Caucasian	66 (95.7)
African American	1 (1.4)
Hispanic	1 (1.4)
Other	1 (1.4)
Body mass index (kg/m^2)	30.2±6.8
Married	46 (66.7)
Currently employed	21 (30.4)
Years of education	14.9±3.2
Pain duration, years	12.2±12.9
Current opioid use	19 (27.5)
Morphine equivalent dose (mg/day)	89.5±132.2

Notes:

* All data in this table have been previously reported. Adapted from Hooten WM, Qu W, Townsend CO, Judd JW. Effects of strength vs aerobic exercise on pain severity in adults with fibromyalgia: a randomized equivalence trial. Pain. 2012;153(4):915–923.⁷ Copyright © 2012 International Association for the Study of Pain; Hooten WM, Rosenberg CJ, Eldrige JS, Qu W. Knee extensor strength is associated with pressure pain thresholds in adults with fibromyalgia. PLoS One. 2013;8(4):e59930.⁸

Abbreviation: SD, standard deviation.

Table 2 Summary values of pain severity, muscle strength, and peak uptake of oxygen (VO₂)

Characteristic	FM patients (n=69)
Pain severity (± standard deviation)*	47.7±4.2
Isometric knee extensor (Nm)*	130.7±45.0
Isokinetic knee extensor 60°/s (Nm)*	92.9±40.3
Isokinetic knee extensor 180°/s	64.2±28.1
Isokinetic knee flexor 60°/s*	53.7±23.0
Isokinetic knee flexor 180°/s	45.0±18.7
Peak VO2 uptake (mL/kg/min)*	16.5±4.2

Notes:

* Data have been previously reported. Adapted from Hooten WM, Qu W, Townsend CO, Judd JW. Effects of strength vs aerobic exercise on pain severity in adults with fibromyalgia: a randomized equivalence trial. Pain. 2012;153(4):915–923.⁷ Copyright © 2012 International Association for the Study of Pain; Hooten WM, Rosenberg CJ, Eldrige JS, Qu W. Knee extensor strength is associated with pressure pain thresholds in adults with fibromyalgia. PLoS One. 2013;8(4):e59930.⁸

Abbreviation: FM, fibromyalgia.

Table 3 Linear regression analyses of pain severity (dependent variable) and muscle strength (independent variable)

Strength (Newton meters)	Univariable B coefficient	P-value	Multivariable B coefficient*	P-value
Isometric knee extensor	−0.028 (95% CI, −0.072 to 0.016)	0.203	−0.048 (95% CI, −0.100 to 0.003)	0.066
Isokinetic knee extensor 60°/s	−0.050 (−0.098 to −0.002)	0.041	−0.062 (−0.114 to −0.010)	0.020
Isokinetic knee extensor 180°/s	−0.090 (−0.158 to −0.022)	0.010	−0.115 (−0.188 to −0.041)	0.003
Isokinetic knee flexor 60°/s	−0.095 (−0.179 to −0.011)	0.028	−0.114 (−0.205 to −0.023)	0.015
Isokinetic knee flexor 180°/s	−0.156 (−0.256 to −0.056)	0.003	−0.184 (−0.291 to −0.077)	0.001

Note:

* Adjusted for age, sex, BMI, and opioid use.

Abbreviations: CI, confidence interval; BMI, body mass index.

HootenWMQuWTownsendCOJuddJWEffects of strength vs aerobic exercise on pain severity in adults with fibromyalgia: a randomized equivalence trialPain2012153491592322341565

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HootenWMRosenbergCJEldrigeJSQuWKnee extensor strength is associated with pressure pain thresholds in adults with fibromyalgiaPLoS One201384e5993023565175

 PubMed Web of Science ®Google Scholar