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Influence of priming exercise on muscle deoxyHb + Mb during ramp cycle exercise
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Influence of priming exercise on muscle deoxyHb + Mb during ramp cycle exercise
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Journal Article
Influence of priming exercise on muscle deoxyHb + Mb during ramp cycle exercise
2012
Overview
The aim of the present study was to gain better insight into the mechanisms underpinning the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise by assessing the changes in the profile following prior high-intensity exercise. Ten physically active students performed two incremental ramp (25 W min
−1
) exercises (AL and LL, respectively) preceded on one occasion by incremental arm (10 W min
−1
) and on another occasion by incremental leg exercise (25 W min
−1
), which served as the reference test (RT). Deoxy[Hb + Mb] was measured by means of near-infrared spectroscopy and surface EMG was recorded at the Vastus Lateralis throughout the exercises. Deoxy[Hb + Mb], integrated EMG and Median Power Frequency (MdPF) were expressed as a function of work rate (W) and compared between the exercises. During RT and AL deoxy[Hb + Mb] followed a sigmoid increase as a function of work rate. However, during LL deoxy[Hb + Mb] increased immediately from the onset of the ramp exercise and thus no longer followed a sigmoid pattern. This different pattern in deoxy[Hb + Mb] was accompanied by a steeper slope of the iEMG/
W
-relationship below the GET (LL: 0.89 ± 0.11% W
−1
; RT: 0.74 ± 0.08% W
−1
; AL: 0.72 ± 0.10% W
−1
) and a more pronounced decrease in MdPF in LL (17.2 ± 4.5%) compared to RT (5.0 ± 2.1%) and AL (3.9 ± 3.2%). It was observed that the sigmoid pattern of deoxy[Hb + Mb] was disturbed when the ramp exercise was preceded by priming leg exercise. Since the differences in deoxy[Hb + Mb] were accompanied by differences in EMG it can be suggested that muscle fibre recruitment is an important underlying mechanism for the pattern of deoxy[Hb + Mb] during ramp exercise.
Publisher
Springer-Verlag,Springer,Springer Nature B.V
Subject
/ Adult
/ Architectural Accessibility - instrumentation
/ Biological and medical sciences
/ Biomedical and Life Sciences
/ Exercise
/ Exercise Test - instrumentation
/ Fundamental and applied biological sciences. Psychology
/ Humans
/ Male
/ Muscle, Skeletal - chemistry
/ Muscle, Skeletal - metabolism
/ Muscle, Skeletal - pathology
/ Occupational Medicine/Industrial Medicine
/ Oxygen Consumption - physiology
/ Pulmonary Gas Exchange - physiology
/ Spectroscopy, Near-Infrared - methods
/ Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
