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  1. Article ; Online: Effects of aerobic exercise on ambulatory blood pressure responses to acute partial sleep deprivation: impact of chronotype and sleep quality.

    Bommarito, Julian C / Millar, Philip J

    American journal of physiology. Heart and circulatory physiology

    2023  Volume 326, Issue 1, Page(s) H291–H301

    Abstract: Blood pressure (BP) follows a circadian rhythm intertwined with the sleep-wake cycle. Acute partial sleep deprivation (PSD; sleep ≤ 6 h) can increase BP, associated with increased cardiovascular risk. Acute exercise can reduce BP for up to 24 h, a ... ...

    Abstract Blood pressure (BP) follows a circadian rhythm intertwined with the sleep-wake cycle. Acute partial sleep deprivation (PSD; sleep ≤ 6 h) can increase BP, associated with increased cardiovascular risk. Acute exercise can reduce BP for up to 24 h, a phenomenon termed postexercise hypotension. The present study tested whether aerobic exercise could mitigate the augmented 24-h ambulatory BP caused by acute PSD. Twenty-four young otherwise healthy adults (22 ± 3 yr; 14 females; self-reported chronotypes: 6 early/10 intermediate/8 late; Pittsburgh sleep quality index: 17 good/7 poor sleepers) completed a randomized crossover trial in which, on different days, they slept normally (2300-0700), restricted sleep [0330-0700 (PSD)], and cycled for 50 min (70-80% predicted heart rate maximum) before PSD. Ambulatory BP was assessed every 30 min until 2100 the next day. Acute PSD increased 24-h systolic BP (control 117 ± 9 mmHg, PSD 122 ± 9 mmHg;
    MeSH term(s) Female ; Humans ; Young Adult ; Blood Pressure/physiology ; Blood Pressure Monitoring, Ambulatory ; Chronotype ; Exercise/physiology ; Hypertension ; Sleep/physiology ; Sleep Deprivation ; Sleep Quality ; Male ; Adult ; Cross-Over Studies
    Language English
    Publishing date 2023-12-01
    Publishing country United States
    Document type Randomized Controlled Trial ; Journal Article
    ZDB-ID 603838-4
    ISSN 1522-1539 ; 0363-6135
    ISSN (online) 1522-1539
    ISSN 0363-6135
    DOI 10.1152/ajpheart.00441.2023
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  2. Article ; Online: Looking beyond the mean: Are racial differences in beat-to-beat blood pressure variability among young men a harbinger for future cardiovascular risk?

    Millar, Philip J

    Experimental physiology

    2020  Volume 105, Issue 7, Page(s) 1055–1057

    MeSH term(s) African Americans ; Blood Pressure ; Cardiovascular Diseases ; Heart Disease Risk Factors ; Heart Rate ; Humans ; Male ; Race Factors ; Risk Factors
    Language English
    Publishing date 2020-06-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 1016295-1
    ISSN 1469-445X ; 0958-0670
    ISSN (online) 1469-445X
    ISSN 0958-0670
    DOI 10.1113/EP088726
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  3. Article ; Online: Investigating the roles of exercise intensity and biological sex on postexercise alterations in cardiac function.

    Coates, Alexandra M / Millar, Philip J / Burr, Jamie F

    Journal of applied physiology (Bethesda, Md. : 1985)

    2023  Volume 134, Issue 2, Page(s) 455–466

    Abstract: The term exercise-induced cardiac fatigue (EICF) has typically been used to describe a transient reduction in cardiac function following prolonged-strenuous exercise. Recent evidence demonstrates that EICF can occur following only 45 min of high- ... ...

    Abstract The term exercise-induced cardiac fatigue (EICF) has typically been used to describe a transient reduction in cardiac function following prolonged-strenuous exercise. Recent evidence demonstrates that EICF can occur following only 45 min of high-intensity exercise when assessed using exercising stress echocardiography. This investigation sought to examine whether sprint intervals (SIT; 6 × 30 s Wingate tests), or 90-min moderate-cycling with sprint intervals (MIX; 90 min with 1 × 30 s Wingate test every 15 min) would cause greater EICF than 90 min (CON) or 3 h (LONG) moderate-cycling assessed using stress echocardiography, with a secondary aim to interrogate sex differences in EICF. Seventeen participants (M: 9, F: 8) underwent three cycling sessions with stress-echocardiography performed before-and-after each condition at a target heart rate (HR) of 100 beats·min
    MeSH term(s) Humans ; Male ; Female ; Ventricular Function, Left/physiology ; Stroke Volume/physiology ; Echocardiography ; Exercise/physiology ; Fatigue
    Language English
    Publishing date 2023-01-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 219139-8
    ISSN 1522-1601 ; 0021-8987 ; 0161-7567 ; 8750-7587
    ISSN (online) 1522-1601
    ISSN 0021-8987 ; 0161-7567 ; 8750-7587
    DOI 10.1152/japplphysiol.00570.2022
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  4. Article ; Online: A single high-fat Western meal modulates vascular responsiveness to sympathetic activation at rest and during exercise in humans: a randomized controlled trial.

    Teixeira, André L / Gangat, Ayesha / Millar, Philip J

    American journal of physiology. Heart and circulatory physiology

    2023  Volume 325, Issue 3, Page(s) H529–H538

    Abstract: A single high-fat Western meal transiently reduces endothelium-dependent vasodilation at rest, but the interaction with sympathetic vasoconstrictor activity during exercise remains unknown. Herein, we tested the hypothesis that a single high-fat Western ... ...

    Abstract A single high-fat Western meal transiently reduces endothelium-dependent vasodilation at rest, but the interaction with sympathetic vasoconstrictor activity during exercise remains unknown. Herein, we tested the hypothesis that a single high-fat Western meal would impair the ability of contracting skeletal muscle to offset vascular responsiveness to sympathetic activation during exercise, termed functional sympatholysis. In 18 (10 females/8 males) healthy young adults, forearm blood flow (Doppler ultrasound) and beat-to-beat arterial pressure (photoplethysmography) were measured during lower-body negative pressure (LBNP; -20 mmHg) applied at rest and simultaneously during low (15% maximum contraction) and moderate (30% maximum contraction)-intensity rhythmic handgrip exercise. The magnitude of sympatholysis was calculated as the difference of LBNP-induced changes in forearm vascular conductance (FVC) between handgrip and rest. Experiments were performed preprandial and 1 h, 2 h, and 3 h after a high- or low-fat meal. In the preprandial state, LBNP decreased resting FVC (Δ-54 ± 10%), and these responses were attenuated during low (Δ-17 ± 7%)- and moderate (Δ-8 ± 6%)-intensity handgrip exercise. Following a high-fat meal, LBNP induced attenuated decreases in resting FVC (3 h postprandial, Δ-47 ± 10%,
    MeSH term(s) Male ; Female ; Young Adult ; Humans ; Hand Strength/physiology ; Exercise/physiology ; Vasoconstrictor Agents/pharmacology ; Vasoconstriction ; Hemodynamics ; Muscle, Skeletal/blood supply ; Sympathetic Nervous System ; Muscle Contraction ; Forearm/blood supply ; Regional Blood Flow/physiology
    Chemical Substances Vasoconstrictor Agents
    Language English
    Publishing date 2023-07-21
    Publishing country United States
    Document type Randomized Controlled Trial ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603838-4
    ISSN 1522-1539 ; 0363-6135
    ISSN (online) 1522-1539
    ISSN 0363-6135
    DOI 10.1152/ajpheart.00283.2023
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  5. Article ; Online: Lower sympathetic transduction of blood pressure in uncontrolled hypertensives: physiological adaptation, methodological limitation, or both?

    Nardone, Massimo / Millar, Philip J

    Journal of human hypertension

    2021  Volume 36, Issue 4, Page(s) 423–424

    MeSH term(s) Adaptation, Physiological ; Antihypertensive Agents/therapeutic use ; Blood Pressure ; Humans ; Hypertension ; Sympathetic Nervous System/physiology
    Chemical Substances Antihypertensive Agents
    Language English
    Publishing date 2021-11-18
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 639472-3
    ISSN 1476-5527 ; 0950-9240
    ISSN (online) 1476-5527
    ISSN 0950-9240
    DOI 10.1038/s41371-021-00638-w
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  6. Article ; Online: Intra- and interday reliability of sympathetic transduction to blood pressure in young, healthy adults.

    Teixeira, André L / Nardone, Massimo / Fernandes, Igor A / Millar, Philip J / Vianna, Lauro C

    Journal of applied physiology (Bethesda, Md. : 1985)

    2024  Volume 136, Issue 4, Page(s) 917–927

    Abstract: Microneurographic recordings of muscle sympathetic nerve activity (MSNA) and the succeeding changes in beat-to-beat blood pressure (i.e., sympathetic transduction) provide important insights into the neural control of the circulation in humans. Despite ... ...

    Abstract Microneurographic recordings of muscle sympathetic nerve activity (MSNA) and the succeeding changes in beat-to-beat blood pressure (i.e., sympathetic transduction) provide important insights into the neural control of the circulation in humans. Despite its widespread use, the reliability of this technique remains unknown. Herein, we assessed the intra- and interday test-retest reliability of signal-averaging sympathetic transduction to blood pressure. Data were analyzed from 15 (9 M/6 F) young, healthy participants who completed two baseline recordings of fibular nerve MSNA separated by 60 min (intraday). The interday reliability was obtained in a subset of participants (
    MeSH term(s) Young Adult ; Humans ; Blood Pressure/physiology ; Reproducibility of Results ; Muscle, Skeletal/physiology ; Sympathetic Nervous System/physiology ; Heart Rate/physiology
    Language English
    Publishing date 2024-02-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 219139-8
    ISSN 1522-1601 ; 0021-8987 ; 0161-7567 ; 8750-7587
    ISSN (online) 1522-1601
    ISSN 0021-8987 ; 0161-7567 ; 8750-7587
    DOI 10.1152/japplphysiol.00009.2024
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  7. Article ; Online: Acute oral antioxidant consumption does not alter brachial artery flow mediated dilation in young adults independent of exercise training status.

    King, Trevor J / Petrick, Heather L / Millar, Philip J / Burr, Jamie F

    Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

    2023  Volume 49, Issue 3, Page(s) 375–384

    Abstract: Endothelium-dependent vasodilation can be tested using a variety of shear stress paradigms, some of which may involve the production of reactive oxygen species. The purpose of this study was to compare different methods for assessing endothelial function ...

    Abstract Endothelium-dependent vasodilation can be tested using a variety of shear stress paradigms, some of which may involve the production of reactive oxygen species. The purpose of this study was to compare different methods for assessing endothelial function and their specific involvement of reactive oxygen species and influence of aerobic training status. Twenty-nine (10 F) young and healthy participants (VO
    MeSH term(s) Female ; Male ; Young Adult ; Humans ; Brachial Artery ; Antioxidants/pharmacology ; Dilatation ; Hand Strength ; Reactive Oxygen Species ; Exercise ; Polyesters
    Chemical Substances Antioxidants ; Reactive Oxygen Species ; Polyesters
    Language English
    Publishing date 2023-11-09
    Publishing country Canada
    Document type Journal Article
    ZDB-ID 2236708-1
    ISSN 1715-5320 ; 1715-5312
    ISSN (online) 1715-5320
    ISSN 1715-5312
    DOI 10.1139/apnm-2023-0218
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  8. Article ; Online: Reply to Fadel et al.

    Nardone, Massimo / Vianna, Lauro C / Millar, Philip J

    American journal of physiology. Regulatory, integrative and comparative physiology

    2022  Volume 322, Issue 2, Page(s) R123–R125

    Language English
    Publishing date 2022-01-19
    Publishing country United States
    Document type Letter ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 603839-6
    ISSN 1522-1490 ; 0363-6119
    ISSN (online) 1522-1490
    ISSN 0363-6119
    DOI 10.1152/ajpregu.00265.2021
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  9. Article ; Online: Upper and lower limb muscle sympathetic responses to contralateral exercise in healthy humans: A pilot study.

    Lee, Jordan B / Katayama, Keisho / Millar, Philip J

    Autonomic neuroscience : basic & clinical

    2022  Volume 243, Page(s) 103024

    Abstract: Muscle sympathetic nerve activity (MSNA) is similar between limbs at rest, although a subset of MSNA bursts do demonstrate limb-specific discharge. Whether limb differences in MSNA synchronicity are present during exercise remains controversial. We ... ...

    Abstract Muscle sympathetic nerve activity (MSNA) is similar between limbs at rest, although a subset of MSNA bursts do demonstrate limb-specific discharge. Whether limb differences in MSNA synchronicity are present during exercise remains controversial. We concurrently measured MSNA from the radial and fibular nerves at rest and during rhythmic handgrip (RHG), static handgrip (SHG), and post-exercise circulatory occlusion (PECO). MSNA burst frequency and incidence were similar between nerve sites during all conditions. Synchronous bursts resulted in larger increases in sympathetic-blood pressure transduction compared to isolated bursts (∆ + 3.6 ± 2.1 vs. +2.3 ± 2.4 mmHg, P = 0.01). The proportion of bursts firing synchronously between nerves at rest was slightly increased during RHG ([rest vs. exercise; mean ± SD] 45.3 ± 7.1 vs. 61.6 ± 7.2 %) and similar during SHG (56.2 ± 7.2 vs. 54 ± 10.6 %). In contrast, burst firing synchronicity increased during PECO (83.8 ± 12.4 %) alongside larger burst amplitudes. Inter-limb differences in resting MSNA are preserved during handgrip exercise, whereas isolated metaboreflex activation results in greater burst synchronization between limbs.
    MeSH term(s) Humans ; Hand Strength/physiology ; Pilot Projects ; Muscle, Skeletal/physiology ; Exercise/physiology ; Sympathetic Nervous System/physiology ; Blood Pressure/physiology ; Lower Extremity
    Language English
    Publishing date 2022-09-09
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2020105-9
    ISSN 1872-7484 ; 1566-0702
    ISSN (online) 1872-7484
    ISSN 1566-0702
    DOI 10.1016/j.autneu.2022.103024
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  10. Article ; Online: New insights into the complexity of arterial baroreflex control of muscle sympathetic outflow in humans.

    Incognito, Anthony V / Millar, Philip J

    The Journal of physiology

    2020  Volume 598, Issue 10, Page(s) 1803–1804

    MeSH term(s) Action Potentials ; Arteries ; Baroreflex ; Humans ; Muscles ; Sympathetic Nervous System
    Language English
    Publishing date 2020-05-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 3115-x
    ISSN 1469-7793 ; 0022-3751
    ISSN (online) 1469-7793
    ISSN 0022-3751
    DOI 10.1113/JP279727
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