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dc.contributor.authorBerg, Ole Kristian
dc.contributor.authorNyberg, Stian Kwak
dc.contributor.authorWindedal, Tobias Midtvedt
dc.contributor.authorWang, Eivind
dc.date.accessioned2023-07-06T11:19:04Z
dc.date.available2023-07-06T11:19:04Z
dc.date.created2018-01-08T14:40:48Z
dc.date.issued2018
dc.identifier.citationAmerican Journal of Physiology. Heart and Circulatory Physiology. 2018, 314 (4), H853-H862.en_US
dc.identifier.issn0363-6135
dc.identifier.urihttps://hdl.handle.net/11250/3076566
dc.description.abstractMaximal strength training (MST) improves work efficiency. However, since blood flow is greatly dictated by muscle contractions in arms during exercise, and vascular conductance is lower, it has been indicated that arms rely more upon adapting oxygen extraction than legs in response to the enhanced work efficiency. Thus, to investigate if metabolic and vascular responses are arm-specific, we utilized Doppler-ultrasound and a catheter placed in the subclavian vein to measure blood flow and a-vO2diff during steady state work in seven young males (24{plus minus}3(SD) years) following six-weeks of handgrip MST. As expected, MST improved maximal strength (49{plus minus}9 to 62{plus minus}10kg) and rate of force development (923{plus minus}224 to 1086{plus minus}238N·s-1), resulting in a reduced submaximal V̇O2 (30{plus minus}9 to 24{plus minus}10ml·min-1) and concomitantly increased work efficiency (9.3{plus minus}2.5 to 12.4{plus minus}3.9%) (all p<0.05). In turn, the work efficiency improvement was associated with a reduced blood flow (486{plus minus}102 to 395{plus minus}114ml·min-1), mediated by a lower blood velocity (43{plus minus}8 to 32{plus minus}6cm·s-1) (all p<0.05). Conduit artery diameter and a-vO2diff remained unaltered. The maximal work test revealed increased time to exhaustion (949{plus minus}239 to 1102{plus minus}292seconds) and maximal work rate (both p<0.05), but no change in peak oxygen uptake. In conclusion, despite prior indications of metabolic and vascular limb-specific differences, these results reveal that improved work efficiency following small muscle mass strength training in the upper extremities is accompanied by a blood flow reduction, and coheres with what has been documented for lower extremities.en_US
dc.language.isoengen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleMaximal strength training-induced improvements in forearm work efficiency are associated with reduced blood flowen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumberH853-H862en_US
dc.source.volume314en_US
dc.source.journalAmerican Journal of Physiology. Heart and Circulatory Physiologyen_US
dc.source.issue4en_US
dc.identifier.doi10.1152/ajpheart.00435.2017
dc.identifier.cristin1537896
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal