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- Cardinale, Daniele A., 1982-, et al.
(författare)
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Influence of Hyperoxic-Supplemented High-Intensity Interval Training on Hemotological and Muscle Mitochondrial Adaptations in Trained Cyclists.
- 2019
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Ingår i: Frontiers in Physiology. - : Frontiers Media S.A.. - 1664-042X. ; 10
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Tidskriftsartikel (refereegranskat)abstract
- Background: Hyperoxia (HYPER) increases O2 carrying capacity resulting in a higher O2 delivery to the working muscles during exercise. Several lines of evidence indicate that lactate metabolism, power output, and endurance are improved by HYPER compared to normoxia (NORM). Since HYPER enables a higher exercise power output compared to NORM and considering the O2 delivery limitation at exercise intensities near to maximum, we hypothesized that hyperoxic-supplemented high-intensity interval training (HIIT) would upregulate muscle mitochondrial oxidative capacity and enhance endurance cycling performance compared to training in normoxia. Methods: 23 trained cyclists, age 35.3 ± 6.4 years, body mass 75.2 ± 9.6 kg, height 179.8 ± 7.9 m, and VO2max 4.5 ± 0.7 L min-1 performed 6 weeks polarized and periodized endurance training on a cycle ergometer consisting of supervised HIIT sessions 3 days/week and additional low-intensity training 2 days/week. Participants were randomly assigned to either HYPER (FIO2 0.30; n = 12) or NORM (FIO2 0.21; n = 11) breathing condition during HIIT. Mitochondrial respiration in permeabilized fibers and isolated mitochondria together with maximal and submaximal VO2, hematological parameters, and self-paced endurance cycling performance were tested pre- and posttraining intervention. Results: Hyperoxic training led to a small, non-significant change in performance compared to normoxic training (HYPER 6.0 ± 3.7%, NORM 2.4 ± 5.0%; p = 0.073, ES = 0.32). This small, beneficial effect on the self-paced endurance cycling performance was not explained by the change in VO2max (HYPER 1.1 ± 3.8%, NORM 0.0 ± 3.7%; p = 0.55, ES = 0.08), blood volume and hemoglobin mass, mitochondrial oxidative phosphorylation capacity (permeabilized fibers: HYPER 27.3 ± 46.0%, NORM 16.5 ± 49.1%; p = 0.37, ES = 3.24 and in isolated mitochondria: HYPER 26.1 ± 80.1%, NORM 15.9 ± 73.3%; p = 0.66, ES = 0.51), or markers of mitochondrial content which were similar between groups post intervention. Conclusions: This study showed that 6 weeks hyperoxic-supplemented HIIT led to marginal gain in cycle performance in already trained cyclists without change in VO2max, blood volume, hemoglobin mass, mitochondrial oxidative phosphorylation capacity, or exercise efficiency. The underlying mechanisms for the potentially meaningful performance effects of hyperoxia training remain unexplained and may raise ethical questions for elite sport.
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| 2. |
- Nordqvist, Ola, et al.
(författare)
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Assessing and achieving readiness to initiate HIV medication
- 2006
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Ingår i: Patient Education and Counseling. - : Elsevier BV. - 0738-3991 .- 1873-5134. ; 62:1, s. 21-30
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Tidskriftsartikel (refereegranskat)abstract
- ObjectiveTo summarise published HIV-specific research on readiness theories, factors influencing readiness, instruments to measure readiness and interventions to increase readiness for treatment.MethodsMedline and PsychInfo were searched until August 2004.ResultsTwo HIV-specific readiness theories were identified. Fear of side effects, emotions emerging from the diagnosis and lack of trust in the physician were some barriers to overcome in order to reach readiness. Of the three measurement instruments found, the index of readiness showed the most promise. Multi-step intervention programs to increase readiness for HIV treatment had been investigated.ConclusionReadiness instruments may be useful tools in clinical practice but the predictive validity of the instruments needs to be further established in the HIV-infected population.Practice implicationsReadiness instruments and practice placebo trials may serve as complements to routine care, since health care providers currently have no better than chance probability in identifying those patients who are ready to adhere.
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| 5. |
- Södergård, Björn, et al.
(författare)
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A structural equation modeling approach to the concepts of adherence and readiness in antiretroviral treatment
- 2007
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Ingår i: Patient Education and Counseling. - : Elsevier BV. - 0738-3991 .- 1873-5134. ; 67:1-2, s. 108-116
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The objective of this secondary analysis of data from a cross-sectional, nation-wide survey, was to test a hypothesized model with two latent concepts (readiness and adherence), based on the theory of trigger events. A secondary objective was to compare this model with two simpler models, without the concept of readiness. METHODS: Data consisted of a consecutive sample of 828 HIV patients > or = 18 years on antiretroviral treatment at 30 out of 32 HIV Clinics in Sweden (response rate 97.5%). Structural equation modeling (SEM) was used to test the models against the empirical data. Chi2 test was used to compare fit between models. RESULTS: The hypothesized model, with two latent concepts (readiness and adherence), fitted the data best (chi(2)=223.508, d.f.=129, p-value<0.0001, GFI=0.970, CFI=0.913, RMSEA=0.030), and significantly better than the models with adherence as the only latent concept. CONCLUSION: Although the SEM technique could not rule out that other models might also fit the data equally well, the hypothesized model, where readiness and adherence were two separate latent concepts, fitted data the best. This supports readiness as a distinct factor that influences adherence and hence treatment outcome. Increased attention should therefore be attached to interventions that focus on the individual' readiness for behavioural change, i.e. factors amendable to change and that can be addressed by the patients themselves. PRACTICE IMPLICATIONS: Based on these results it seems necessary to shift focus from adherence to readiness, especially in conditions where treatment can be postponed such as antiretroviral treatment.
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| 6. |
- Södergård, Björn, 1973-
(författare)
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Adherence and Readiness to Antiretroviral Treatment
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Antiretroviral therapy places extraordinarily high demands on adherence, since non-adherence affects both individuals and society due to the spread of resistant viral strains. The aims of the thesis were to investigate the prevalence of adherence in Swedish HIV-infected patients, changes in adherence over time, and factors associated with adherence, including patients’ readiness to adhere. Further, to investigate the collaboration between nurses, doctors and pharmacists after the introduction of a HIV-clinic satellite pharmacy. Data were collected via two cross-sectional patient surveys in 1998 and 2002, qualitative interviews with health care personnel at a major HIV clinic, and a nation-wide, cross-sectional patient survey in 2003-2004. The level of adherence improved from 28% in 1998 to 57% in 2002, possibly due to simplified treatment and a new multi-professional treatment model at the clinic. The proportion of adherent patients was 63% in the nationwide survey. Factors associated with adherence were high age, high quality patient-provider relationships, no drug or alcohol problems and shorter time on treatment. A hypothesized structural equational model, using readiness and adherence as separate latent concepts, was tested and found to support readiness as a distinct factor influencing adherence. The health care personnel believed that conventional pharmacies had several disadvantages in serving the HIV infected population. They found the HIV-clinic satellite pharmacy valuable, since it contributed to increased communication and trust between the health care professions, and improved teamwork in medication management.In conclusion, the level of adherence increased over time, and several factors associated with adherence were identified. Improved collaboration between health care professionals may enhance treatment support, and increased attention should be given to interventions that focus on the individual’s readiness for behavioural change in order to optimize treatment outcomes.
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| 7. |
- Södergård, Björn, et al.
(författare)
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Adherence to treatment in Swedish HIV infected patients
- 2006
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Ingår i: Journal of Clinical Pharmacy and Therapeutics. - : Hindawi Limited. - 0269-4727 .- 1365-2710. ; 31:6, s. 605-616
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: The objectives were to assess the prevalence of adherence to antiretroviral treatment in Swedish human immunodeficiency virus (HIV)-infected patients and to evaluate factors associated with adherence. Methods: All HIV-treated patients, who attended one of 30 (of a total of 32) Swedish infectious diseases clinics, during 7 months, were asked to complete an anonymous questionnaire containing the 9-item Morisky Medication Adherence Scale (MMAS) and questions about other factors potentially affecting adherence. The summary score of MMAS ranges from 1 to 13, where 13 indicates perfect adherence; patients scoring 11 or above (corresponding to 95% adherence level) were classified as 'adherent'. Results and discussion: In total 946 patients participated (response rate 97.5%). The proportion of patients who reported not missing a dose during the day prior to the completion of the questionnaire was 97% and the proportion classified as 'adherent' was 63%. 'Adherent' patients were more likely to have a good relationship with their health care professionals (P < 0.05) and not have problems with drugs or alcohol (P < 0.01). Being older (P < 0.01) and having a shorter time on current treatment (P < 0.01) and on treatment in total (P < 0.05) were factors also associated with good adherence. Conclusion: Factors modifiable for interventions by health care professionals are patient-provider relationship, drug or alcohol problems and patients with long treatment periods.
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| 8. |
- Södergård, Björn, et al.
(författare)
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Differences in adherence and motivation to HIV therapy : Two independent assessments in 1998 and 2002
- 2006
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Ingår i: Pharmacy World & Science. - : Springer Science and Business Media LLC. - 0928-1231 .- 1573-739X. ; 28:4, s. 248-256
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Tidskriftsartikel (refereegranskat)abstract
- Objective: The aim of this study was to compare the level of adherence and motivation in two independent cross-sectional samples of HIV-infected patients conducted in 1998 and 2002, and to investigate the relationship between adherence and motivation. Method: Consecutive HIV-infected patients on treatment at a Swedish clinic were asked to complete an anonymous questionnaire. In 1998, 60 patients participated and in 2002, 53 participated. In 2002, the 9-item Morisky Medication Adherence Scale (MMAS) was added to the questionnaire set. Main outcome measure: Self-reported adherence and motivation. Results: In 1998, 28.1% of the respondents were considered adherent, while the corresponding proportion was 57.4% in 2002 (P = 0.002). The mean summary score for MMAS was 10.7 in 2002 (13 = perfect adherence). The proportion considered motivated were 22.4% in the 1998 survey and 41.3% in 2002 (P = 0.038). Of the respondents considered motivated in the 2002 survey, 46.7% scored the maximum summary score on the MMAS, while 8.7% of the non-motivated respondents did so (P = 0.016). Conclusion: The respondents in 2002 were more adherent and motivated than the respondents in 1998 and a relationship between motivation and adherence was found. The difference in adherence and motivation might be due to a new treatment model at the clinic.
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