CARDIOVASCULAR RESPONSE IN MEN AND WOMEN TO MAXIMAL VOLUNTARY ISOMETRIC CONTRACTION BY THREE MUSCLE GROUPS

1983 ◽  
Vol 15 (2) ◽  
pp. 163
Author(s):  
S. B. Going ◽  
T. E. Ball ◽  
B. H. Hassey
Keyword(s):  
Isometric Contraction ◽  
Cardiovascular Response ◽  
Maximal Voluntary Isometric Contraction ◽  
Men And Women ◽  
Muscle Groups

Cardiovascular and nitric oxide response after maximal voluntary isometric contraction in adolescents with and without Down Syndrome v1

2021 ◽  
Author(s):  
Geiziane Leite Rodrigues Melo ◽  
Dahan Cunha Nascimento ◽  
Weldson Abreu ◽  
Rafael Olher ◽  
Lysleine Deus ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Down Syndrome ◽  
Isometric Contraction ◽  
Cardiovascular Response ◽  
Exercise Session ◽  
Isometric Handgrip ◽  
Maximal Voluntary Isometric Contraction ◽  
Post Exercise ◽  
Muscle Groups ◽  
Familiarization Session

Background This study was designed to compare the cardiovascular and nitric oxide (NO) responses to maximal voluntary isometric contraction (MVIC) with different muscle groups (leg press [LEP] and isometric handgrip [IHG] exercise) of adolescents with Down syndrome (DS) and age-matched non-DS peers. We also aimed to compare the absolute and relative IHG strength between groups. MethodsEleven adolescents with DS (14.1 ± 1.0 years) and ten without DS (13.7 ± 1.25 years)participants performed two experimental sessions of LEP and IHG exercises: 1) familiarization session and 2) 3 attempts x 5-sec contraction at MVIC with 3-min rest interval. Blood pressure (BP), heart rate (HR) and NO were collected at rest, immediately post-exercise session, and 10-min post-exercise. Results There were no differences for cardiovascular and NO responses between groups for MVIC test using different muscle groups. However, DS group displayed a lower but not significantly cardiovascular response at rest and after MVIC tests than controls. Furthermore, DS group displayed a higher NO- concentration at rest, recovery and after IHG when compared to controls (P< 0.05). In addition, DS adolescents displayed a significantly lower level in absolute and relative IHG strength when compared to controls (P = 0.001). Conclusions Individuals with DS display a lower cardiovascular response at rest and after MVIC tests than controls and higher NO response after exercise.

Increased cardiovascular response to static contraction of larger muscle groups

1983 ◽  
Vol 54 (2) ◽  
pp. 434-437 ◽  
Author(s):  
D. R. Seals ◽  
R. A. Washburn ◽  
P. G. Hanson ◽  
P. L. Painter ◽  
F. J. Nagle
Keyword(s):  
Muscle Mass ◽  
Maximal Voluntary Contraction ◽  
Cardiovascular Response ◽  
Isometric Exercise ◽  
Voluntary Contraction ◽  
Active Muscle ◽  
Leg Extension ◽  
Arterial Blood ◽  
Static Contraction ◽  
Muscle Groups

The purpose of this study was to investigate the influence of the size of the active muscle mass on the cardiovascular response to static contraction. Twelve male subjects performed one-arm handgrip (HG), two-leg extension (LE), and a “dead-lift” maneuver (DL) in a randomly assigned order for 3 min at 30% of maximal voluntary contraction. O2 uptake (VO2), heart rate (HR), and mean intra-arterial blood pressure (MABP) were measured at rest and, in addition to absolute tension exerted, throughout contraction. There was a direct relationship between the size of the active muscle mass and the magnitude of the increases in VO2, HR, and MABP, even though all contractions were performed at the same relative intensity. Tension, VO2, HR, and MABP increased progressively from HG to LE to DL. It was concluded that at the same percentage of maximal voluntary contraction, the magnitude of the cardiovascular response to isometric exercise is directly influenced by the size of the contracting muscle mass.

scholarly journals Reliability of Motor Unit Behavior during a Maximal Voluntary Isometric Contraction of the Knee Extensors

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 340-341
Author(s):  
Ryan J. Colquhoun ◽  
Patrick M. Tomko ◽  
Mitchel A. Magrini ◽  
Sydnie R. Fleming ◽  
Matthew C. Ferrell ◽  
...  
Keyword(s):  
Motor Unit ◽  
Isometric Contraction ◽  
Knee Extensors ◽  
Maximal Voluntary Isometric Contraction

Simultaneous potentiation and fatigue in quadriceps after a 60-second maximal voluntary isometric contraction

1991 ◽  
Vol 70 (2) ◽  
pp. 726-731 ◽  
Author(s):  
R. W. Grange ◽  
M. E. Houston
Keyword(s):  
Isometric Contraction ◽  
Recovery Period ◽  
Lactate Concentration ◽  
Fold Increase ◽  
Quadriceps Muscle ◽  
Muscle Performance ◽  
Light Chains ◽  
Maximal Voluntary Isometric Contraction ◽  
Muscle Lactate ◽  
Isometric Twitch

Potential mechanisms of fatigue (metabolic factors) and potentiation (phosphate incorporation by myosin phosphorylatable light chains) were investigated during recovery from a 60-s maximal voluntary isometric contraction (MVC) in the quadriceps muscle of 12 subjects. On separate days before and for 2 h after the 60-s MVC, either a 1-s MVC or electrically stimulated contractions were used as indexes to test muscle performance. Torque at the end of the 60-s MVC was 57% of the initial level, whereas torques from a 1-s MVC and 50-Hz stimulation were most depressed in the immediate recovery period. At this time, muscle biopsy analyses revealed significant decreases in ATP and phosphocreatine and a 19-fold increase in muscle lactate. Conversely, isometric twitch torque and torque from a 10-Hz stimulus were the least depressed of six contractile indexes and demonstrated potentiation of 25 and 34%, respectively, by 4 min of recovery (P less than 0.05). At this time, muscle lactate concentration was still 16 times greater than at rest. An increased phosphate content of the myosin phosphorylatable light chains (P less than 0.05) was also evident both immediately and 4 min after the 60-s MVC. We conclude that the 60-s MVC produced marked force decreases likely due to metabolic displacement, while the limited decline in the twitch and 10-Hz torques and their significant potentiation suggested that myosin phosphorylation may provide a mechanism to enhance contractile force under conditions of submaximal activation during fatigue.

scholarly journals Influence of Exercise Order on Electromyographic Activity During Upper Body Resistance Training

2014 ◽  
Vol 44 (1) ◽  
pp. 203-210 ◽  
Author(s):  
Rafael Soncin ◽  
Juliana Pennone ◽  
Thiago M. Guimarães ◽  
Bruno Mezêncio ◽  
Alberto C. Amadio ◽  
...  
Keyword(s):  
Bench Press ◽  
Pectoralis Major ◽  
Upper Body ◽  
Shoulder Abduction ◽  
Electromyographic Activity ◽  
Triceps Brachii ◽  
Maximal Voluntary Isometric Contraction ◽  
Anterior Deltoid ◽  
Muscle Groups ◽  
Long Head

Abstract The purpose of this study was to investigate the effects of exercise order on electromyographic activity in different muscle groups among youth men with experience in strength training. Three sets of 8 RM were performed of each exercise in two sequences order: (a) sequence A: bench press, chest fly, shoulder press, shoulder abduction, close grip bench press and lying triceps extension; (b) sequence B: the opposite order. The electromyographic activity was analyzed in the sternocostal head of the pectoralis major, anterior deltoid, and long head triceps brachii, normalized for maximal voluntary isometric contraction. The muscles activity of the sternocostal head of the pectoralis major, anterior deltoid, and long head triceps brachii showed significant interaction between sequence and exercise. The sternocostal head of the pectoralis major showed considerably higher activity in sequence A (100.13 ± 13.56%) than sequence B (81.47 ± 13.09%) for the chest fly. The anterior deltoid showed significantly higher electromyographic activity in sequence B (86.81 ± 40.43%) than sequence A (66.15 ± 22.02%) for the chest fly, whereas for the lying triceps extension, the electromyographic activity was significantly higher in sequence A (53.89 ± 27.09%) than sequence B (34.32 ± 23.70%). For the long head triceps brachii, only the shoulder press showed differences between sequences (A = 52.43 ± 14.64 vs. B = 38.53 ± 16.26). The present study showed that the exercise order could modify the training results even though there was no alteration in volume and intensity of the exercise. These changes may result in different training adaptations.

scholarly journals Cardiovascular response to trigeminal nerve stimulation at rest and during exercise in humans: does sex matter?

2018 ◽  
Vol 315 (1) ◽  
pp. R68-R75 ◽  
Author(s):  
Eliza Prodel ◽  
Thales C. Barbosa ◽  
Antonio C. Nóbrega ◽  
Lauro C. Vianna
Keyword(s):  
Sex Differences ◽  
Trigeminal Nerve ◽  
Nerve Stimulation ◽  
Cardiovascular Response ◽  
Resistance Index ◽  
Cardiovascular Responses ◽  
Cycling Exercise ◽  
Men And Women ◽  
Trigeminal Nerve Stimulation ◽  
The Face

We sought to investigate the possibility that there are sex differences in the cardiovascular responses to trigeminal nerve stimulation (TGS) with cold exposure to the face at rest and during dynamic exercise. In 9 healthy men (age: 28 ± 3 yr; height: 178 ± 1 cm; weight: 77 ± 8 kg) and 13 women (age 26 ± 5 yr; height 164 ± 3 cm; weight 63 ± 7 kg) beat-to-beat heart rate (HR) and blood pressure were recorded. Mean arterial pressure (MAP), stroke volume (SV), cardiac index (CI), and total vascular resistance index (TVRI) were calculated. TGS was applied for 3 min at rest and in-between 10-min steady-state cycling exercise at a HR of 110 beats/min, the measurements were obtained during the last minute of each period. At rest, TGS increased MAP (men: Δ18 ± 8 mmHg; women: Δ23 ± 8 mmHg; means ± SD), TVRI (men: Δ1.1 ± 0.6 mmHg·l−1·min·m−2; women: Δ1.2 ± 1.2 mmHg·l−1·min·m−2) and SV (men: Δ19 ± 15 ml; women: Δ16 ± 11 ml) in both groups. CI increased with TGS in women but not in men. However, men presented a bradycardic response to TGS (Δ−11 ± 8 beats/min) that was not significant in women compared with baseline. Cycling exercise increased HR, MAP, SV, and CI and decreased TVRI in men and women. TGS during exercise further increased MAP in men and women and did not change CI in either group. SV and TVRI increased with TGS during exercise only in women. TGS during exercise evoked bradycardia in men (Δ−7 ± 9 beats/min), whereas HR was unchanged in women. Our findings indicate sex differences in TGS-related cardiovascular responses at rest and during exercise.

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