Effects of different duration contractions on elasticity, blood volume, and oxygen saturation of human tendon in vivo

Kubo, Keishi; Ikebukuro, Toshihiro; Yaeshima, Katsutoshi; Kanehisa, Hiroaki

doi:10.1007/s00421-009-1037-2

Cited by 16 publications

(32 citation statements)

References 41 publications

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“…The repeatability of measurements in tendon THb and StO2 was confirmed in our previous studies [16][17][18] .…”

Section: Methodssupporting

confidence: 79%

“…Following 10 min of baseline measurements, the subjects performed five sets of 50 repetitions at 70% of MVC for 1 s, with a 2-s gap between repetitions and a 1-min rest between each set. According to our previous study 18) , THb and StO2 of the tendon increased significantly after this task. During contractions, the subjects were encouraged to maintain the target force displayed on an oscilloscope.…”

Section: Repeated Isometric Contractions (Experiments 2)supporting

confidence: 56%

“…We demonstrated that blood volume and oxygen saturation in tendons increased significantly after repeated ballistic contractions, but remained unchanged after repeated isometric contractions with a long duration 18) . However, we cannot deny the possibility that increases in blood volume in tendons after repeated contractions reflect a mere hyperemia after exercise as a physiological response 2) .…”

Section: Introductionmentioning

confidence: 80%

“…Furthermore, we found that changes in blood volume and oxygen saturation in the tendons differed among contraction modes [17][18][19] . We demonstrated that blood volume and oxygen saturation in tendons increased significantly after repeated ballistic contractions, but remained unchanged after repeated isometric contractions with a long duration 18) .…”

Section: Introductionmentioning

confidence: 82%

“…These changes in blood flow in tendons markedly differ from those in muscles 23) . Previous studies using ultrasonography showed that the tendon force and elongation relationship was curvilinear consisting of an initial region (toe region) characterized by a large increase in tendon elongation with increasing force 18,19) . Therefore, one of the possible reasons is that BF within the tendons may be already stopped during contractions at even lower force level, because the tendon would be elongated considerably.…”

Section: Discussionmentioning

confidence: 99%

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Measurement of blood flow in the human Achilles tendon <i>in vivo</i>

Kubo

Ishigaki

Ikebukuro

2017

JPFSM

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The purpose of this study was to apply a high-power laser blood flowmeter and laser oxygenation monitor to investigate 1) changes during a single isometric contraction and 2) changes after repeated contractions in blood flow (BF), blood volume (THb), and oxygen saturation (StO 2) in the human Achilles tendon in vivo. Subjects (n = 17) performed isometric contractions at 10%, 30%, and 50% of the maximum voluntary contraction (MVC) for 1 min. Subjects (n = 10) also performed five sets of 50 repetitions at 70% of MVC for 1 second (s), and remained relaxed for 20 min. During isometric contractions at all torque levels, BF decreased significantly from resting level regardless of torque level, whereas THb during contractions tended to decrease with increases in torque level. After repeated contractions, BF, THb, and StO2 were higher during the recovery period than resting level. These results show that 1) BF in the tendon was already interrupted during 10% of MVC to the same degree as that during 50% of MVC, whereas THb during contractions slightly decreased with increases in the torque level and 2) blood circulation (BF, THb, and StO2) within the tendon was facilitated further after repeated contractions.

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“…The repeatability of measurements in tendon THb and StO2 was confirmed in our previous studies [16][17][18] .…”

Section: Methodssupporting

confidence: 79%

Section: Repeated Isometric Contractions (Experiments 2)supporting

confidence: 56%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Measurement of blood flow in the human Achilles tendon <i>in vivo</i>

Kubo

Ishigaki

Ikebukuro

2017

JPFSM

Self Cite

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Short‐term exercise‐induced changes in hydration state of healthy achilles tendons can be visualized by effects of off‐resonant radiofrequency saturation in a three‐dimensional ultrashort echo time MRI sequence applied at 3 tesla

Syha

Springer

Grözinger

et al. 2013

Magnetic Resonance Imaging

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Time course of changes in the human Achilles tendon properties and metabolism during training and detraining in vivo

et al. 2011

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The purpose of this study was to investigate the time course of changes in human tendon properties and metabolism during resistance training and detraining. Nine men (21-27 years) completed 3 months of isometric plantar flexion training and another 3 months of detraining. At the beginning and on every 1 month of training and detraining periods, the stiffness, blood circulation (blood volume and oxygen saturation), serum procollagen type 1 C-peptide (P1P; reflects synthesis of type 1 collagen), echointensity (reflects collagen content), and MRI signal intensity (reflects collagen structure) of the Achilles tendon were measured. Tendon stiffness did not change until 2 months of training, and the increase (50.3%) reached statistical significance at the end of the training period. After 1 month of detraining, tendon stiffness had already decreased to pre-training level. Blood circulation in the tendon did not change during the experimental period. P1P increased significantly after 2 months of training. Echointensity increased significantly by 9.1% after 2 months of training, and remained high throughout the experiment. MRI signal intensity increased by 24.2% after 2 months and by 21.4% after 3 months of training, but decreased to the pre-training level during the detraining period. These results suggested that the collagen synthesis, content, and structure of human tendons changed at the 2-month point of training period. During detraining, the sudden decrease in tendon stiffness might be related to changes in the structure of collagen fibers within the tendon.

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Effects of different duration contractions on elasticity, blood volume, and oxygen saturation of human tendon in vivo

Cited by 16 publications

References 41 publications

Measurement of blood flow in the human Achilles tendon <i>in vivo</i>

Measurement of blood flow in the human Achilles tendon <i>in vivo</i>

Short‐term exercise‐induced changes in hydration state of healthy achilles tendons can be visualized by effects of off‐resonant radiofrequency saturation in a three‐dimensional ultrashort echo time MRI sequence applied at 3 tesla

Time course of changes in the human Achilles tendon properties and metabolism during training and detraining in vivo

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