| 1. |
- Engstrom, Elise, et al.
(författare)
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Comparison of heart rate measured by Polar RS400 and ECG, validity and repeatability
- 2012
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Ingår i: Advances in Physiotherapy. - : Informa Healthcare. - 1403-8196 .- 1651-1948. ; 14:3, s. 115-122
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Tidskriftsartikel (refereegranskat)abstract
- Aims: The purpose of this study was to investigate criterion-related validity and testretest repeatability of the heart rate monitor Polar RS400 versus electrocardiogram (ECG). Methodology: Ten healthy subjects, 19-34 years, performed a cycle ergometer test 5 min on each load (50, 100 and 150 W). Heart rate (HR) was measured with ECG and Polar RS400 and recorded digitally. After at least one hour resting the test was repeated. Major findings: The results showed a significant correlation between HR measured by ECG and by Polar RS400 with correlation coefficients ranging from 0.97 to 1.00. In test 1 the mean difference ±2SD between HR Polar and HR ECG was 0.7±4.3 bpm and in test 2, 0.2±3.2 bpm. In the repeated tests, the mean difference of HR between test 2 and test 1±2SD was 3.2±11.9 bpm with ECG and 2.6±14.3 bpm with Polar RS400 and these differences were not statistically significant. Conclusion: This study indicates good criterion-related validity and testretest repeatability of Polar RS400. Differences observed at individual levels should be noticed, but are not considered to be clinically important. Polar RS400 is thus well suited for recording HR during physical activity and exercise training. © 2012 Informa Healthcare.
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| 2. |
- Engström, E, et al.
(författare)
-
Comparison of heart rate measured by Polar RS 400 and ECG, validity and repeatability .
- 2012
-
Ingår i: Advances in Physiotherapy. - 1651-1948. ; 14:3, s. 115-122
-
Tidskriftsartikel (refereegranskat)abstract
- Aims: The purpose of this study was to investigate criterion-related validity and test–retest repeatability of the heart rate monitor Polar RS400 versus electrocardiogram (ECG). Methodology: Ten healthy subjects, 19–34 years, performed a cycle ergometer test 5 min on each load (50, 100 and 150 W). Heart rate (HR) was measured with ECG and Polar RS400 and recorded digitally. After at least one hour resting the test was repeated. Major findings: The results showed a significant correlation between HR measured by ECG and by Polar RS400 with correlation coefficients ranging from 0.97 to 1.00. In test 1 the mean difference ± 2SD between HR Polar and HR ECG was 0.7 ± 4.3 bpm and in test 2, 0.2 ± 3.2 bpm. In the repeated tests, the mean difference of HR between test 2 and test 1 ± 2SD was 3.2 ± 11.9 bpm with ECG and 2.6 ± 14.3 bpm with Polar RS400 and these differences were not statistically significant. Conclusion: This study indicates good criterion-related validity and test–retest repeatability of Polar RS400. Differences observed at individual levels should be noticed, but are not considered to be clinically important. Polar RS400 is thus well suited for recording HR during physical activity and exercise training.
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| 3. |
- Hallberg, Ludvig, et al.
(författare)
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Exercise-induced release of cytokines in patients with major depressive disorder.
- 2010
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Ingår i: Journal of Affective Disorders. - : Elsevier BV. - 1573-2517 .- 0165-0327. ; Apr 8, s. 262-267
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Patients with major depressive disorder (MDD) may display elevated plasma levels of pro-inflammatory substances. Although the underlying mechanisms are unknown, inflammation has been proposed to play a direct role in the generation of depressive symptoms. Skeletal muscle is a potent producer of cytokines, and physical exercise has been suggested to alleviate symptoms of depression. In this study we therefore addressed the question of whether MDD patients display altered levels of pro-, anti-inflammatory and regulatory factors in the blood in response to acute exercise. METHODS: Eighteen MDD patients and 18 healthy controls performed a maximal-workload exercise challenge. Blood samples were taken before the test, at sub-maximal and maximal workload, as well as 30 and 60min after testing. The plasma levels of SAA, TNF-alpha, S-VCAM, S-ICAM, CRP, IFN-gamma, IL-1beta, IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-12 and IL-13 were assayed using multiplex sandwich ELISA. RESULTS: Exercise-induced significant changes in the plasma levels of inflammatory substances in both MDD patients and controls. IL-8, IL-6 and TNF-alpha increased, and IL-4 decreased during the challenge in both groups. In addition, IFN-gamma decreased in the controls. There was a significant difference in IL-6 reactivity between the groups at the sub-max timepoint. LIMITATIONS: Group sizes are comparably limited. CONCLUSION: Exercise induces changes in the blood levels of cytokines in unmedicated MDD patients. Whether these changes affect symptoms of depression should be evaluated in long-term studies of the anti-depressive effects of exercise.
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| 4. |
- Wisén, Anita, et al.
(författare)
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Arbetsprov på löpband/gångmatta
- 2013
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Ingår i: Kliniska arbetsprov: metoder för diagnos och prognos. ; , s. 137-144
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Wisén, Anita, et al.
(författare)
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Plasma ANP and BNP during exercise in patients with major depressive disorder and in healthy controls
- 2011
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Ingår i: JOURNAL OF AFFECTIVE DISORDERS. - : Elsevier BV. - 0165-0327 .- 1573-2517. ; 129:1-3, s. 371-375
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Tidskriftsartikel (refereegranskat)abstract
- Increased levels of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) have been shown to reduce the hormones in the HPA axis. In this study we addressed the question whether patients with unmedicated major depressive disorder (MDD) might have altered baseline levels of these natriuretic peptides and an altered response to acute exercise. METHODS: An incremental exercise test was performed in 18 patients with MDD and in 18 healthy controls. Plasma concentrations of ANP and BNP were determined at rest, during the exercise test and 30 min post exercise using immunoradiometric assays. RESULTS: During the exercise test the concentrations of ANP and BNP increased significantly in both groups. The MDD group showed significantly lower levels of ANP than the controls at rest, at maximal work rate and post exercise and of BNP at rest and at maximal work rate. The dynamic changes of both ANP and BNP, respectively, from baseline to maximal work rate were significantly lower in the MDD group. A slightly lower (non-significant) maximal work rate was observed in the MDD group compared with the controls. LIMITATIONS: Group sizes are relatively limited. CONCLUSION: Lower concentrations of ANP and BNP during rest and exercise were observed in the MDD patients together with a decreased dynamic response to maximal exercise. Hypothetically, the reduced ANP and BNP concentration contributes to the high hormone levels in the HPA system seen in depressive disorders. Of interest for future research is whether physical training might increase the levels of ANP and BNP and thereby diminish depressive symptoms.
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