Article

OBJECTIVE: To test the hypothesis that autonomic modulation after resistance
exercise (RE) would be reduced in women with fibromyalgia (FM) compared with
controls. DESIGN: Before-after trial. SETTING: Testing occurred in a university
setting. PARTICIPANTS: Women with FM (n=9) and healthy controls (n=9) underwent
testing before (pre) and 20 minutes after (post) RE. INTERVENTIONS: Not
applicable. MAIN OUTCOME MEASURES: Normalized low-frequency (LFnu) and normalized
high-frequency (HFnu) oscillations and the LFnu/HFnu ratio were indicative of
sympathetic modulation, parasympathetic modulation, and sympathovagal balance,
respectively. Baroreceptor reflex sensitivity (BRS) was also measured. RESULTS:
Variables were similar in both groups at rest. HFnu decreased in controls (pre,
55.0+/-4.2%; post, 35.0+/-4.7%; P<.05) and increased in women with FM (pre,
57.0+/-5.7%; post, 63.2+/-4.6%; P<.05). LFnu increased in controls (pre,
43.3+/-4.4%; post, 63.2+/-4.8%; P<.05) and decreased in women with FM (pre,
41.8+/-5.6%; post, 35.6+/-4.7%; P<.05). The LFnu/HFnu ratio increased in controls
(pre, 0.89+/-0.17; post, 2.43+/-0.64; P<.05) with no change in women with FM
(pre, 0.90+/-0.22; post, 0.64+/-0.13; P=.13). BRS decreased in controls (pre,
8.78+/-1.42 ms/mmHg; post, 5.49+/-0.66 ms/mmHg; P<.05), but not in women with FM
(pre, 5.91+/-1.22 ms/mmHg; post, 9.23+/-2.4 ms/mmHg; P=.16). CONCLUSIONS: After
acute RE, women with FM responded differently from controls, demonstrated by
lower sympathetic and higher vagal modulation without altering BRS. These
postexercise responses may be attributed to the altered autonomic responsiveness
to physiologic stress that characterizes FM.

Langue : ANGLAIS