Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 53) Show all publications
Väisänen, D., Ekblom, Ö., Ekblom Bak, E., Andersson, E., Nilsson, J. & Ekblom, M. (2020). Criterion validity of the Ekblom-Bak and the Åstrand submaximal test in an elderly population.. European Journal of Applied Physiology, 120(2), 307-316
Open this publication in new window or tab >>Criterion validity of the Ekblom-Bak and the Åstrand submaximal test in an elderly population.
Show others...
2020 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 120, no 2, p. 307-316Article in journal (Refereed) Published
Abstract [en]

PURPOSE: The aim of this study was to validate the submaximal Ekblom-Bak test (EB-test) and the Åstrand test (Å-test) for an elderly population.

METHODS: Participants (n = 104), aged 65-75 years, completed a submaximal aerobic test on a cycle ergometer followed by an individually adjusted indirect calorimetry VO2max test on a treadmill. The HR from the submaximal test was used to estimate VO2max using both the EB-test and Å-test equations.

RESULTS: The correlation between measured and estimated VO2max using the EB method and Å method in women was r = 0.64 and r = 0.58, respectively and in men r = 0.44 and r = 0.44, respectively. In women, the mean difference between estimated and measured VO2max was - 0.02 L min-1 (95% CI - 0.08 to 0.04) for the EB method and - 0.12 L min-1 (95% CI - 0.22 to - 0.02) for the Å method. Corresponding values for men were 0.05 L min-1 (95% CI - 0.04 to 0.14) and - 0.28 L min-1 (95% CI - 0.42 to - 0.14), respectively. However, the EB method was found to overestimate VO2max in men with low fitness and the Å method was found to underestimate VO2max in both women and men. For women, the coefficient of variance was 11.1%, when using the EB method and 19.8% when using the Å method. Corresponding values for men were 11.6% and 18.9%, respectively.

CONCLUSION: The submaximal EB-test is valid for estimating VO2max in elderly women, but not in all elderly men. The Å-test is not valid for estimating VO2max in the elderly.

Place, publisher, year, edition, pages
Springer, 2020
Keywords
Cardiorespiratory fitness, Elderly, Oxygen uptake, Public health, Submaximal test, Validity
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology; Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5960 (URN)10.1007/s00421-019-04275-7 (DOI)31820103 (PubMedID)
Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2020-02-24
Eftestøl, E., Psilander, N., Cumming, K. T., Juvkam, I., Ekblom, M., Sunding, K., . . . Gundersen, K. (2020). Muscle memory: Are myonuclei ever lost? [Letter to the editor]. Journal of applied physiology, 128, 456-457
Open this publication in new window or tab >>Muscle memory: Are myonuclei ever lost?
Show others...
2020 (English)In: Journal of applied physiology, ISSN 8750-7587, E-ISSN 1522-1601, Vol. 128, p. 456-457Article in journal, Letter (Other academic) Published
Place, publisher, year, edition, pages
American Physiological Society, 2020
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5982 (URN)10.1152/japplphysiol.00761.2019 (DOI)31854249 (PubMedID)
Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-02-24Bibliographically approved
Larsson, K., Kallings, L., Ekblom, Ö., Blom, V., Andersson, E. & Ekblom, M. (2019). Criterion validity and test-retest reliability of SED-GIH, a single item question for assessment of daily sitting time.. BMC Public Health, 19(1), Article ID 19:17.
Open this publication in new window or tab >>Criterion validity and test-retest reliability of SED-GIH, a single item question for assessment of daily sitting time.
Show others...
2019 (English)In: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 19, no 1, article id 19:17Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Sedentary behaviour has been closely linked to metabolic and cardiovascular health and is therefore of importance in disease prevention. A user-friendly tool for assessment of sitting time is thus needed. Previous studies concluded that the present tools used to assess a number of sedentary behaviours are more likely to overestimate sitting than single-item questions which often underestimate sitting time, and that categorical answering options are recommended. In line with this, the single-item question with categorical answering options, SED-GIH, was developed. The aim of this study was to investigate the criterion validity of the SED-GIH question using activPAL3 micro as the criterion measure. The second aim was to evaluate the test-retest reliability of the SED-GIH questionnaire.

METHOD: In the validity section of this study, 284 middle-aged adults answered a web questionnaire, which included SED-GIH, wore activPAL and filled in a diary log for one week. Spearman's rho assessed the relationship between the SED-GIH answers and the daily average sitting time as monitored by the activPAL (activPAL-SIT), a Weighted Kappa assessed the agreement, ANOVA assessed differences in activPAL-SIT between the SED-GIH answer categories, and a Chi2 compared the proportions of hazardous sitters between the different SED-GIH answer categories. In the reliability section, 95 elderly participants answered the SED-GIH question twice, with a mean interval of 5.2 days. The reliability was assessed with ICC and a weighted Kappa.

RESULTS: The SED-GIH question correlated moderately with activPAL-SIT (rho = 0.31), with a poor agreement (weighted Kappa 0.12). In total, 40.8% underestimated and 22.2% overestimated their sitting time. The ANOVA showed significant differences in activPAL-SIT between the different SED-GIH answer categories (p < 0.001). The Chi2 showed a significant difference in proportion of individuals sitting more than 10 h per day within each SED-GIH answer category. ICC for the test-retest reliability of SED-GIH was excellent with ICC = 0.86, and the weighted Kappa showed an agreement of 0.77.

CONCLUSIONS: The unanchored single item SED-GIH question showed excellent reliability but poor validity in the investigated populations. Validity and reliability of SED-GIH is in line with other questionnaires that are commonly used when assessing sitting time.

Place, publisher, year, edition, pages
BioMed Central, 2019
Keywords
Adults, Office-based work, Older adults, Reliability, Sedentary behaviour, Sitting, Validity, activPAL
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5520 (URN)10.1186/s12889-018-6329-1 (DOI)30611226 (PubMedID)
Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08
Ekblom, M., Bojsen-Möller, E., Tarassova, O. & Ekblom, Ö. (2019). Day-to day variations in physical activity patterns affect corticospinal excitability on the following day. In: Brain Stimulation March-April 2019, vol 12, issue 2: . Paper presented at 3rd International Brain Stimulation Conference, Feb 24-27 2019, Vancouver (pp. 468). Elsevier, 12(2), Article ID 437.
Open this publication in new window or tab >>Day-to day variations in physical activity patterns affect corticospinal excitability on the following day
2019 (English)In: Brain Stimulation March-April 2019, vol 12, issue 2, Elsevier, 2019, Vol. 12, no 2, p. 468-, article id 437Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5738 (URN)10.1016/j.brs.2018.12.523 (DOI)
Conference
3rd International Brain Stimulation Conference, Feb 24-27 2019, Vancouver
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-12-02Bibliographically approved
Ekblom, M., Ekblom, Ö., Börjesson, M., Bergström, G., Jern, C. & Wallin, A. (2019). Device-Measured Sedentary Behavior, Physical Activity and Aerobic Fitness Are Independent Correlates of Cognitive Performance in Healthy Middle-Aged Adults-Results from the SCAPIS Pilot Study.. International Journal of Environmental Research and Public Health, 16(24), Article ID E5136.
Open this publication in new window or tab >>Device-Measured Sedentary Behavior, Physical Activity and Aerobic Fitness Are Independent Correlates of Cognitive Performance in Healthy Middle-Aged Adults-Results from the SCAPIS Pilot Study.
Show others...
2019 (English)In: International Journal of Environmental Research and Public Health, ISSN 1661-7827, E-ISSN 1660-4601, Vol. 16, no 24, article id E5136Article in journal (Refereed) Published
Abstract [en]

High aerobic fitness, more moderate to vigorous physical activity (MVPA) and less sedentary behavior (SED) have all been suggested to promote cognitive functions, but it is unclear whether they are independent predictors of specific cognitive domains. This study aimed to investigate to what extent aerobic fitness MVPA and SED are independently associated with cognitive performance among middle-aged Swedish adults. We acquired device-based measures of aerobic fitness, cognitive performance and percent daily time spent in MVPA and SED in Swedish adults (n = 216; 54-66 years old). Aerobic fitness was associated with better performance at one out of two tests of speed/attention and one out of four tests of executive attention, and with worse performance at one of seven tests of memory. Increasing %MVPA was associated with better performance at one out of seven tests of memory and two out of three tests of verbal ability, whereas increasing %SED was associated with better performance at all four tests of executive attention and four out of seven tests of memory. These findings suggest that aerobic fitness, %MVPA and %SED are partly independent correlates of cognitive performance. To fully understand the association between SED and performance at several tests of cognitive function, future investigations might attempt to investigate intellectually engaging SED (such as reading books) separately from mentally undemanding SED (such as watching TV).

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
accelerometry, cognitive functions, exercise, physical activity, sedentary behavior
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5980 (URN)10.3390/ijerph16245136 (DOI)31888199 (PubMedID)
Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07
Hirschberg, A. L., Elings Knutsson, J., Helge, T., Godhe, M., Ekblom, M., Bermon, S. & Ekblom, B. (2019). Effects of moderately increased testosterone concentration on physical performance in young women: a double blind, randomised, placebo controlled study. British Journal of Sports Medicine
Open this publication in new window or tab >>Effects of moderately increased testosterone concentration on physical performance in young women: a double blind, randomised, placebo controlled study
Show others...
2019 (English)In: British Journal of Sports Medicine, ISSN 0306-3674, E-ISSN 1473-0480Article in journal (Refereed) Epub ahead of print
Abstract [en]

Objective To investigate the effects of a moderate increase in serum testosterone on physical performance in young, physically active, healthy women.Methods A double blind, randomised, placebo controlled trial was conducted between May 2017 and June 2018 (ClinicalTrials.gov ID: NCT03210558). 48 healthy, physically active women aged 18–35 years were randomised to 10 weeks of treatment with 10 mg of testosterone cream daily or placebo (1:1). All participants completed the study. The primary outcome measure was aerobic performance measured by running time to exhaustion (TTE). Secondary outcomes were anaerobic performance (Wingate test) and muscle strength (squat jump (SJ), counter movement jump (CMJ) and knee extension peak torque). Hormone levels were analysed and body composition assessed by dual energy X-ray absorptiometry.Results Serum levels of testosterone increased from 0.9 (0.4) nmol/L to 4.3 (2.8) nmol/L in the testosterone supplemented group. TTE increased significantly by 21.17 s (8.5%) in the testosterone group compared with the placebo group (mean difference 15.5 s; P=0.045). Wingate average power, which increased by 15.2 W in the testosterone group compared with 3.2 W in the placebo group, was not significantly different between the groups (P=0.084). There were no significant changes in CMJ, SJ and knee extension. Mean change from baseline in total lean mass was 923 g for the testosterone group and 135 g for the placebo group (P=0.040). Mean change in lean mass in the lower limbs was 398 g and 91 g, respectively (P=0.041).Conclusion The study supports a causal effect of testosterone in the increase in aerobic running time as well as lean mass in young, physically active women.

Place, publisher, year, edition, pages
BMJ Publishing Group Ltd, 2019
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5869 (URN)10.1136/bjsports-2018-100525 (DOI)31615775 (PubMedID)
Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-29Bibliographically approved
Gago, P., Arndt, A., Marques, M. C., Marinho, D. A. & Ekblom, M. (2019). Effects of post activation potentiation on electromechanical delay. Clinical Biomechanics, 70, 115-122
Open this publication in new window or tab >>Effects of post activation potentiation on electromechanical delay
Show others...
2019 (English)In: Clinical Biomechanics, ISSN 0268-0033, E-ISSN 1879-1271, Vol. 70, p. 115-122Article in journal (Refereed) Published
Abstract [en]

Electromechanical delay (EMD) presumably depends upon both contractile and tensile factors. It has recently been used as an indirect measure of muscle tendon stiffness to study adaptations to stretching and training. The aim of the present study was to investigate whether contractile properties induced by a 6 s maximum voluntary isometric contraction (MVIC) could affect EMD without altering passive muscle tendon stiffness or stiffness index. Plantar flexor twitches were evoked via electrical stimulation of the tibial nerve in eight highly trained male sprinters before and after a 6 s MVIC in passive isometric or passively shortening or lengthening muscles. For each twitch, EMD, twitch contractile properties and SOLM-Wave were measured. Passive muscle tendon stiffness was measured from the slope of the relation between torque and ankle angle during controlled passive dorsal flexion and stiffness index by curve-fitting the torque angle data using a second-order polynomial function. EMD did not differ between isometric, lengthening or shortening movements. EMD was reduced by up to 11.56 ± 5.64% immediately after the MVIC and stayed depressed for up to 60 s after conditioning. Peak twitch torque and rate of torque development were potentiated by up to 119.41 ± 37.15% and 116.06 ± 37.39%, respectively. Rising time was reduced by up to 14.46 ± 7.22%. No significant changes occurred in passive muscle tendon stiffness or stiffness index. Using a conditioning MVIC, it was shown that there was an acute enhancement of contractile muscle properties as well as a significant reduction in EMD with no corresponding changes in stiffness. Therefore, caution should be taken when using and interpreting EMD as a proxy for muscle tendon stiffness.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Muscle, Twitch, Potentiation, Electromechanical delay, Stiffness
National Category
Physiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5820 (URN)10.1016/j.clinbiomech.2019.08.001 (DOI)31476603 (PubMedID)
Note

At the time of Paulo Gago's dissertation this article was a manuscript.

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-17Bibliographically approved
Psilander, N., Eftestøl, E., Cumming, K. T., Juvkam, I., Ekblom, M., Sunding, K., . . . Gundersen, K. (2019). Effects of training, detraining, and retraining on strength, hypertrophy, and myonuclear number in human skeletal muscle. Journal of applied physiology, 126(6), 1636-1645
Open this publication in new window or tab >>Effects of training, detraining, and retraining on strength, hypertrophy, and myonuclear number in human skeletal muscle
Show others...
2019 (English)In: Journal of applied physiology, ISSN 8750-7587, E-ISSN 1522-1601, Vol. 126, no 6, p. 1636-1645Article in journal (Refereed) Published
Abstract [en]

Previously trained mouse muscles acquire strength and volume faster than naïve muscles; it has been suggested that this is related to increased myonuclear density. The present study aimed to determine whether a previously strength-trained leg (mem-leg) would respond better to a period of strength training than a previously untrained leg (con-leg). Nine men and 10 women performed unilateral strength training (T1) for 10 weeks, followed by 20 weeks of detraining (DT) and a 5-week bilateral retraining period (T2). Muscle biopsies were taken before and after each training period and analyzed for myonuclear number, fiber volume, and cross-sectional area (CSA). Ultrasound and one repetition of maximum leg extension were performed to determine muscle thickness (MT) and strength. CSA (~17%), MT (~10%), and strength (~20%) increased during T1 in the mem-leg. However, the myonuclear number and fiber volume did not change. MT and CSA returned to baseline values during DT, but strength remained elevated (~60%), supporting previous findings of a long-lasting motor learning effect. MT and strength increased similarly in the mem-leg and con-leg during T2, whereas CSA, fiber volume, and myonuclear number remained unaffected. In conclusion, training response during T2 did not differ between the mem-leg and con-leg. However, this does not discount the existence of human muscle memory since no increase in the number of myonuclei was detected during T1 and no clear detraining effect was observed for cell size during DT; thus, the present data did not allow for a rigorous test of the muscle memory hypothesis.

Place, publisher, year, edition, pages
American Physiological Society, 2019
Keywords
CSA, exercise, motor learning, muscle memory, myonuclei
National Category
Sport and Fitness Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5716 (URN)10.1152/japplphysiol.00917.2018 (DOI)000471217500014 ()30991013 (PubMedID)
Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-08-14Bibliographically approved
Godhe, M., Ekblom, Ö., Ekblom, M., Pontén, M. & Andersson, E. (2019). Improved daily movement patterns in an accelerometer-assessed 8-weeks exercise project in older adults. In: British Journal of Sports Medicine Vol 53, suppl 1: . Paper presented at Scandinavian Sports Medicine Congress, Jan 30 - Feb 1 2019, Copenhagen (pp. A2). BMJ Publishing Group Ltd, 53
Open this publication in new window or tab >>Improved daily movement patterns in an accelerometer-assessed 8-weeks exercise project in older adults
Show others...
2019 (English)In: British Journal of Sports Medicine Vol 53, suppl 1, BMJ Publishing Group Ltd, 2019, Vol. 53, p. A2-Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
BMJ Publishing Group Ltd, 2019
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5737 (URN)10.1136/bjsports-2019-scandinavianabs.6 (DOI)
Conference
Scandinavian Sports Medicine Congress, Jan 30 - Feb 1 2019, Copenhagen
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-20Bibliographically approved
Nooijen, C. F., Blom, V., Ekblom, Ö., Ekblom, M. & Kallings, L. (2019). Improving office workers' mental health and cognition: a 3-arm cluster randomized controlled trial targeting physical activity and sedentary behavior in multi-component interventions. BMC Public Health, 19, Article ID 266.
Open this publication in new window or tab >>Improving office workers' mental health and cognition: a 3-arm cluster randomized controlled trial targeting physical activity and sedentary behavior in multi-component interventions
Show others...
2019 (English)In: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 19, article id 266Article in journal (Refereed) Published
Abstract [en]

Background

Physically inactive and sedentary lifestyles are negatively related to both mental health and cognition. For office-workers, who spend two-thirds of their workday sitting, it is important to improve these lifestyles. The aim of this study is to assess the effectiveness of multi-component interventions, incorporating individual, environmental and organizational changes, to increase physical activity or reduce sedentary behavior among office-workers in order to improve mental health and cognition.

Methods

a 3-arm, clustered randomized controlled trial (RCT) with waiting list control group amongst adult office-workers of two large Swedish companies. Cluster teams will be randomized into 6-month interventions or to a passive waiting list control group which will receive the allocated intervention with a 6-month delay. Two multicomponent interventions will be studied of which one focuses on improving physical activity and the other on reducing sedentary behavior. Both interventions include 5 sessions of motivational counselling. In the physical activity intervention persons also get access to a gym and team leaders will organize lunch walks and encourage to exercise. In the sedentary behavior intervention standing- and walking meetings will be implemented and team leaders will encourage to reduce sitting. The recruitment target is 110 office-workers per arm (330 in total). Measurements will be repeated every 6months for a total intended duration of 24months. Proximal main outcomes are physical activity measured with accelerometers and sedentary behavior with inclinometers. Distal outcomes are self-reported mental health and a cognition test battery. Additional outcomes will include cardiovascular fitness, body composition, sleep, self-reported physical activity and sedentary behavior, other health habits, physical health, and working mechanisms from blood samples and questionnaires.

Discussion

This cluster RCT will contribute to the currently available evidence by comparing the effectiveness of multi-component interventions targeting physical activity or sedentary behavior with the end goal of improving mental health and cognition. This study is strong in its cluster randomized design, numerous objective outcome measures and long-term follow-up. The exact content of the interventions has been defined by combining theory with results from a larger research project as well as having a continuous dialogue with the involved companies.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5646 (URN)10.1186/s12889-019-6589-4 (DOI)000460405200003 ()30836957 (PubMedID)
Projects
Fysisk aktivitet och hälsosamma hjärnfunktioner bland kontorsarbetare: Delprojekt 3, Långsiktiga interventioner
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-08-06
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7879-9188

Search in DiVA

Show all publications