scholarly journals Relationship between oxygenation in inactive biceps brachii muscle and hyperventilation during leg cycling

2007 ◽  
pp. 57-65
Author(s):  
H Ogata ◽  
T Arimitsu ◽  
R Matsuura ◽  
T Yunoki ◽  
M Horiuchi ◽  
...  
Keyword(s):  
Ventilatory Threshold ◽  
Biceps Brachii ◽  
Peak Oxygen Uptake ◽  
Muscle Oxygenation ◽  
Time Shift ◽  
Second Step ◽  
Biceps Brachii Muscle ◽  
Leg Cycling ◽  
Two Factors ◽  
Forearm Muscle

Inactive forearm muscle oxygenation has been reported to begin decreasing from the respiratory compensation point (RCP) during ramp leg cycling. From the RCP, hyperventilation occurs with a decrease in arterial CO2 pressure (PaCO2). The aim of this study was to determine which of these two factors, hyperventilation or decrease in PaCO2, is related to a decrease in inactive biceps brachii muscle oxygenation during leg cycling. Each subject (n = 7) performed a 6-min two-step leg cycling. The exercise intensity in the first step (3 min) was halfway between the ventilatory threshold and RCP (170+/-21 watts), while that in the second step (3 min) was halfway between the RCP and peak oxygen uptake (240+/-28 watts). The amount of hyperventilation and PaCO2 were calculated from gas parameters. The average cross correlation function in seven subjects between inactive muscle oxygenation and amount of hyperventilation showed a negative peak at the time shift of zero (r = -0.72, p<0.001), while that between inactive muscle oxygenation and calculated PaCO2 showed no peak near the time shift of zero. Thus, we concluded that decrease in oxygenation in inactive arm muscle is closely coupled with increase in the amount of hyperventilation.

Comparison between maximal lengthening and shortening contractions for biceps brachii muscle oxygenation and hemodynamics

2010 ◽  
Vol 109 (3) ◽  
pp. 710-720 ◽  
Author(s):  
Makii Muthalib ◽  
Hoseong Lee ◽  
Guillaume Y. Millet ◽  
Marco Ferrari ◽  
Kazunori Nosaka
Keyword(s):  
Muscle Damage ◽  
Near Infrared ◽  
Biceps Brachii ◽  
Oxygenation Index ◽  
Creatine Kinase Activity ◽  
Muscle Oxygenation ◽  
Biceps Brachii Muscle ◽  
Before And After ◽  
Tissue Oxygenation Index ◽  
Systemic Oxygen

Eccentric contractions (ECC) require lower systemic oxygen (O2) and induce greater symptoms of muscle damage than concentric contractions (CON); however, it is not known if local muscle oxygenation is lower in ECC than CON during and following exercise. This study compared between ECC and CON for changes in biceps brachii muscle oxygenation [tissue oxygenation index (TOI)] and hemodynamics [total hemoglobin volume (tHb) = oxygenated-Hb + deoxygenated-Hb], determined by near-infrared spectroscopy over 10 sets of 6 maximal contractions of the elbow flexors of 10 healthy subjects. This study also compared between ECC and CON for changes in TOI and tHb during a 10-s sustained and 30-repeated maximal isometric contraction (MVC) task measured immediately before and after and 1–3 days following exercise. The torque integral during ECC was greater ( P < 0.05) than that during CON by ∼30%, and the decrease in TOI was smaller ( P < 0.05) by ∼50% during ECC than CON. Increases in tHb during the relaxation phases were smaller ( P < 0.05) by ∼100% for ECC than CON; however, the decreases in tHb during the contraction phases were not significantly different between sessions. These results suggest that ECC utilizes a lower muscle O2 relative to O2 supply compared with CON. Following exercise, greater ( P < 0.05) decreases in MVC strength and increases in plasma creatine kinase activity and muscle soreness were evident 1–3 days after ECC than CON. Torque integral, TOI, and tHb during the sustained and repeated MVC tasks decreased ( P < 0.01) only after ECC, suggesting that muscle O2 demand relative to O2 supply during the isometric tasks was decreased after ECC. This could mainly be due to a lower maximal muscle mass activated as a consequence of muscle damage; however, an increase in O2 supply due to microcirculation dysfunction and/or inflammatory vasodilatory responses after ECC is recognized.

Muscle Oxygenation Trends During Dynamic Exercise Measured by Near Infrared Spectroscopy

2004 ◽  
Vol 29 (4) ◽  
pp. 504-523 ◽  
Author(s):  
Yagesh N. Bhambhani
Keyword(s):  
Oxygen Uptake ◽  
Blood Volume ◽  
Near Infrared ◽  
Ventilatory Threshold ◽  
Biceps Brachii ◽  
Vastus Lateralis ◽  
Dynamic Exercise ◽  
Muscle Oxygenation ◽  
Muscle Deoxygenation ◽  
Significant Difference

During the last decade, NIRS has been used extensively to evaluate the changes in muscle oxygenation and blood volume during a variety of exercise modes. The important findings from this research are as follows: (a) There is a strong correlation between the lactate (ventilatory) threshold during incremental cycle exercise and the exaggerated reduction in muscle oxygenation measured by NIRS. (b) The delay in steady-state oxygen uptake during constant work rate exercise at intensities above the lactate/ventilatory threshold is closely related to changes in muscle oxygenation measured by NIRS. (c) The degree of muscle deoxygenation at the same absolute oxygen uptake is significantly lower in older persons compared younger persons; however, these changes are negated when muscle oxygenation is expressed relative to maximal oxygen uptake values. (d) There is no significant difference between the rate of biceps brachii and vastus lateralis deoxygenation during arm cranking and leg cycling exercise, respectively, in males and females. (e) Muscle deoxygenation trends recorded during short duration, high-intensity exercise such as the Wingate test indicate that there is a substantial degree of aerobic metabolism during such exercise. Recent studies that have used NIRS at multiple sites, such as brain and muscle tissue, provide useful information pertaining to the regional changes in oxygen availability in these tissues during dynamic exercise. Key words: blood volume, noninvasive measurement

Biceps brachii muscle oxygenation in electrical muscle stimulation

2010 ◽  
pp. no-no ◽  
Author(s):  
Makii Muthalib ◽  
Marc Jubeau ◽  
Guillaume Y. Millet ◽  
Nicola A. Maffiuletti ◽  
Marco Ferrari ◽  
...  
Keyword(s):  
Biceps Brachii ◽  
Muscle Oxygenation ◽  
Muscle Stimulation ◽  
Biceps Brachii Muscle ◽  
Electrical Muscle Stimulation ◽  
Electrical Muscle

Climbing-specific finger flexor performance and forearm muscle oxygenation in elite male and female sport climbers

2011 ◽  
Vol 112 (8) ◽  
pp. 2839-2847 ◽  
Author(s):  
Marc Philippe ◽  
Daniel Wegst ◽  
Tom Müller ◽  
Christian Raschner ◽  
Martin Burtscher
Keyword(s):  
Muscle Oxygenation ◽  
Male And Female ◽  
Forearm Muscle

scholarly journals Is it the coracobrachialis superior muscle, or is it an unidentified rare variant of coracobrachialis muscle?

2021 ◽  
Author(s):  
Łukasz Olewnik ◽  
Nicol Zielinska ◽  
Łukasz Gołek ◽  
Paloma Aragonés ◽  
Jose Ramon Sanudo
Keyword(s):  
Case Report ◽  
Rare Variant ◽  
Shoulder Joint ◽  
Biceps Brachii ◽  
Coracoid Process ◽  
Biceps Brachii Muscle ◽  
Shoulder Region

AbstractThe coracobrachialis muscle (CBM) originates from the apex of the coracoid process, in common with the short head of the biceps brachii muscle, and from the intermuscular septum. The CBM demonstrates variability in both the proximal and distal attachment, with some extremely rare varieties, such as the coracobrachialis superior, coracobrachialis longus and coracocapsularis muscle. This case report describes an extremely rare variant of the coracobrachialis superior muscle, or a very rare variant of the CBM. Our findings highlight the importance of muscle variants in the shoulder region, especially the coracoid region, and are significant for radiologists, anatomists, physiotherapists and surgeons specializing in the shoulder joint.

scholarly journals Older Adults Exhibit a Reduced Ability to Fully Activate Their Biceps Brachii Muscle

1999 ◽  
Vol 54 (5) ◽  
pp. M249-M253 ◽  
Author(s):  
G. H. Yue ◽  
V. K. Ranganathan ◽  
V. Siemionow ◽  
J. Z. Liu ◽  
V. Sahgal
Keyword(s):  
Older Adults ◽  
Biceps Brachii ◽  
Biceps Brachii Muscle

scholarly journals Muscle length and joint angle influence spinal but not corticospinal excitability to the biceps brachii across forearm postures

2019 ◽  
Vol 122 (1) ◽  
pp. 413-423 ◽  
Author(s):  
Davis A. Forman ◽  
Daniel Abdel-Malek ◽  
Christopher M. F. Bunce ◽  
Michael W. R. Holmes
Keyword(s):  
Isometric Contraction ◽  
Elbow Joint ◽  
Joint Angle ◽  
Biceps Brachii ◽  
Motor Evoked Potentials ◽  
Muscle Length ◽  
Elbow Flexion ◽  
Corticospinal Excitability ◽  
Biceps Brachii Muscle ◽  
Spinal Excitability

Forearm rotation (supination/pronation) alters corticospinal excitability to the biceps brachii, but it is unclear whether corticospinal excitability is influenced by joint angle, muscle length, or both. Thus the purpose of this study was to separately examine elbow joint angle and muscle length on corticospinal excitability. Corticospinal excitability to the biceps and triceps brachii was measured using motor evoked potentials (MEPs) elicited via transcranial magnetic stimulation. Spinal excitability was measured using cervicomedullary motor evoked potentials (CMEPs) elicited via transmastoid electrical stimulation. Elbow angles were manipulated with a fixed biceps brachii muscle length (and vice versa) across five unique postures: 1) forearm neutral, elbow flexion 90°; 2) forearm supinated, elbow flexion 90°; 3) forearm pronated, elbow flexion 90°; 4) forearm supinated, elbow flexion 78°; and 5) forearm pronated, elbow flexion 113°. A musculoskeletal model determined biceps brachii muscle length for postures 1–3, and elbow joint angles ( postures 4–5) were selected to maintain biceps length across forearm orientations. MEPs and CMEPs were elicited at rest and during an isometric contraction of 10% of maximal biceps muscle activity. At rest, MEP amplitudes to the biceps were largest during supination, which was independent of elbow joint angle. CMEP amplitudes were not different when the elbow was fixed at 90° but were largest in pronation when muscle length was controlled. During an isometric contraction, there were no significant differences across forearm postures for either MEP or CMEP amplitudes. These results highlight that elbow joint angle and biceps brachii muscle length can each independently influence spinal excitability. NEW & NOTEWORTHY Changes in upper limb posture can influence the responsiveness of the central nervous system to artificial stimulations. We established a novel approach integrating neurophysiology techniques with biomechanical modeling. Through this approach, the effects of elbow joint angle and biceps brachii muscle length on corticospinal and spinal excitability were assessed. We demonstrate that spinal excitability is uniquely influenced by joint angle and muscle length, and this highlights the importance of accounting for muscle length in neurophysiological studies.

Biceps Rupture in Water-related Sporting Activities

2010 ◽  
Vol 2 (2) ◽  
pp. 127-130
Author(s):  
Cheng H. Lo ◽  
Christopher Coombs ◽  
Simon N. Bell
Keyword(s):  
Biceps Brachii ◽  
Early Recognition ◽  
Biceps Brachii Muscle ◽  
Muscle Repair ◽  
Biceps Muscle ◽  
Muscle Belly ◽  
Injury Management ◽  
Muscle Rupture ◽  
Biceps Rupture ◽  
Sporting Activities

Closed traumatic disruptions of biceps brachii muscle belly are rarely seen. In this paper, we report two rare cases of biceps brachii muscle belly rupture sustained while water-skiing or wakeboarding and discuss the mechanism of injury, management and outcomes after a literature review. A review of published articles revealed only three previously reported cases of water skiing related biceps muscle rupture. It is important to be vigilant of these injuries, given that early recognition and operative intervention with or without direct muscle repair may optimise outcomes.

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