Temat: exercise intensity - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Acute aerobic exercise enhances pleasant compared to unpleasant visual scene processing
Autorzy:: Wyczesany, Mirosław
Roesmann, Kati
Junghofer, Markus
Heiko, Wagner
Maciejczyk, Marcin
Ligęza, Tomasz
Opis:: Although acute aerobic exercise benefits different aspects of emotional functioning, it is unclear how exercise influences the processing of emotional stimuli and which brain mechanisms support this relationship. We assessed the influence of acute aerobic exercise on valence biases (preferential processing of negative/positive pictures) by performing source reconstructions of participants’ brain activity after they viewed emotional scenes. Twenty-four healthy participants (12 women) were tested in a randomized and counterbalanced design that consisted of three experimental protocols, each lasting 30 min: low-intensity exercise (Low-Int); moderate-intensity exercise (Mod-Int); and a seated rest condition (REST). After each of the protocols, participants viewed negative and positive pictures, during which event-related magnetic fields were recorded. Analyses revealed that exercise strongly impacted the valence processing of emotional scenes within a widely distributed left hemispheric spatio-temporal cluster between 190 and 310 ms after picture onset. Brain activity in this cluster showed that a negativity bias at REST (negative > positive picture processing) diminished after the Low-Int condition (positive = negative) and even reversed to a positivity bias after the Mod-Int condition (positive > negative). Thus, acute aerobic exercise of low and moderate intensities induces a positivity bias which is reflected in early, automatic processes.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Moderate-intensity exercise boosts the N2 neural inhibition marker: a randomized and counterbalanced ERP study with precisely controlled exercise intensity
Autorzy:: Ligęza, Tomasz
Maciejczyk, Marcin
Szygula, Zbigniew
Kałamała-Ligęza, Patrycja
Wyczesany, Mirosław
Opis:: A prior session of moderate intensity continuous exercise (MCE) benefits performance during tasks requiring conflict resolution but the specific cognitive process that underlies this improvement remains unknown. Many studies postulate that MCE increases inhibition, but ERP evidence is ambiguous due to significant differences across past procedures. Most importantly, exercise intensity, which modulates the relationship between acute exercise and cognitive processes, might have varied across past ERP studies. Additionally, previous procedures may not have sufficiently engaged the inhibition process during tasks. The aim of this study was to assess the effects of an acute exercise session on behavioral (accuracy, RT) and ERP (N2, P3b) indices of cognitive processes engaged in conflict resolution. Contrary to most previous studies, we determined ventilatory thresholds (VTD) in order to precisely control exercise metabolism. Moreover, to ensure engagement of inhibition we used a flanker task in a version eliciting strong conflict. 18 male adults underwent three testing sessions in a randomized and counterbalanced order: moderate-intensity continuous exercise (MCE), high-intensity interval exercise (HIIE), and seated rest condition. After each session participants performed the flanker task, during which EEG data was collected. Compared with the control condition, exercise between the first (VT1) and the second (VT2) ventilatory threshold (MCE), but not exercise that exceeded VT2 (HIIE), improved performance in the task and increased the N2 component, which is a neural marker of inhibition. The study shows that MCE might directly benefit inhibition and shows the need for more precise measures of exercise intensity in future studies
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Energy expenditure for massage therapists during performing selected classical massage techniques
Autorzy:: Więcek, Magdalena
Szymura, Jadwiga
Maciejczyk, Marcin
Szyguła, Zbigniew
Cempla, Jerzy
Borkowski, Mateusz
Tematy:: physiotherapy
oxygen consumption
exercise intensity
energy expenditure
classical massage
heart rate reserve; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/2162018.pdf Link otwiera się w nowym oknie
Opis:: Objectives The aim of the study is to evaluate the intensity of the effort and energy expenditure in the course of performing selected classical massage techniques and to assess the workload of a massage therapist during a work shift. Material and Methods Thirteen massage therapists (age: 21.9±1.9 years old, body mass index: 24.5±2.8 kg×m⁻², maximal oxygen consumption × body mass⁻¹ ($\text{VO}_\text{2max}$×BM⁻¹): 42.3±7 ml×kg⁻¹×min⁻¹) were involved in the study. The stress test consisted in performing selected classical massage techniques in the following order: stroking, kneading, shaking, beating, rubbing and direct vibration, during which the cardio-respiratory responses and the subjective rating of perceived exertion (RPE) were assessed. Intensity of exercise during each massage technique was expressed as % $\text{VO}_\text{2max}$, % maximal heart rate ($\text{HR}_\text{max}$) and % heart rate reserve (HRR). During each massage technique, net energy expenditure (EE) and energy cost of work using metabolic equivalent of task (MET) were determined. Results The intensity of exercise was 47.2±6.2% as expressed in terms of % $\text{VO}_\text{2max}$, and 74.7±3.2% as expressed in terms of % $\text{HR}_\text{max}$, while it was 47.8±1.7% on average when expressed in terms of % HRR during the whole procedure. While performing the classical massage, the average EE and MET were 5.6±0.9 kcal×min⁻¹ and 5.6±0.2, respectively. The average RPE calculated for the entire procedure was 12.1±1.4. During the performance of a classical massage technique for a single treatment during the study, the average total EE was 176.5±29.6 kcal, resulting in an energy expenditure of 336.2±56.4 kcal×h⁻¹. In the case of the classical massage technique, rubbing was the highest intensity exercise for the masseur who performed the massage ($\text{%VO}_\text{2max}$ = 57.4±13.1%, $\text{HR}_\text{max}$ = 79.6±7.7%, HRR = 58.5±13.1%, MET = 6.7±1.1, EE = 7.1±1.4 kcal×min⁻¹, RPE = 13.4±1.3). Conclusions In the objective assessment, physical exercise while performing a single classical massage is characterized by hard work. The technique of classical massage during which the masseur performs the highest exercise intensity is rubbing. According to the classification of work intensity based on energy expenditure, the masseur’s work is considered heavy during the whole work shift. Int J Occup Med Environ Health 2018;31(5):677–684
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Dlaczego już po jednej sesji wysiłku fizycznego czujemy się lepiej? Mózgowy mechanizm poprawy nastroju jako wynik zmian w komunikacji korowej
Why we feel better after just one session of physical exercise? Brain mechanism of mood improvement as a result of changes in cortical connectivity
Autorzy:: Nowak, Izabela
Opis:: The aim of this study was to examine whether a single session of physical exercise benefits mood and affects interaction between dorsolateral prefrontal cortex (associated with affective control) and temporal regions (affective cortical areas), which was estimated by Directed Transfer Function (DTF, an EEG effective connectivity method). In three testing sessions took part 18 male adults in a counterbalanced and randomized order: moderate-intensity continuous exercise, high-intensity interval exercise and seated rest condition. During each session, participants cycled on a stationary ergometer for 24 minutes. Before and after an exercise protocol the 3 minutes of resting state EEG was recorded. The results show a significant increase in communication flow from prefrontal lobe to temporal regions, after both sessions of exercise in comparison to seated rest condition. The study suggests that changes in effective connectivity might underlie mood improvement after a physical exercise.
Celem powyższego badania było sprawdzenie, czy pojedyncza sesja wysiłku fizycznego poprawia nastrój oraz wpływa na interakcję pomiędzy grzbietowo-boczną korą przedczołową (odpowiedzialną za kontrolę afektywną) oraz obszarami skroniowymi (uczestniczącymi w korowych procesach afektywnych), co oszacowano za pomocą Skierowanej Funkcji Przenoszenia (DTF, metoda badania łączności efektywnej EEG). W trzech sesjach eksperymentalnych wzięło udział 18 młodych mężczyzn w losowej i zrównoważonej kolejności: wysiłek o umiarkowanej intensywności, wysiłek interwałowy o wysokiej intensywności i brak wysiłku. Podczas każdej sesji uczestnicy pedałowali na stacjonarnym ergometrze przez 24 minuty. Przed i po każdym protokole eksperymentalnym rejestrowano 3-minutowy zapis EEG spoczynkowego. Wyniki wykazały istotny wzrost w przepływie informacji pomiędzy korą przedczołową a obszarami skroniowymi po obu rodzajach wysiłku w porównaniu z jego brakiem. Badanie sugeruje, że zmiany w efektywnej łączności korowej mogą leżeć u podłoża poprawy nastroju po wysiłku fizycznym.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Acute aerobic exercise enhances cortical connectivity between structures involved in shaping mood and improves self-reported mood : an EEG effective-connectivity study in young male adults
Autorzy:: Wyczesany, Mirosław
Szyguła, Zbigniew
Nowak, Izabela
Maciejczyk, Marcin
Ligęza, Tomasz
Opis:: There seems to be a general consensus among researchers that acute aerobic exercise (exercise hereafter) improves mood, but the neural mechanisms which drive these effects are far from being clear. The current study investigated the cortical connectivity patterns that underlie changes in mood after exercise. Twenty male adults underwent three different experimental protocols that were carefully controlled in terms of underlying metabolism and were administered in a randomized order: moderate-intensity continuous exercise, high-intensity interval exercise, and seated rest condition. Before and after each experimental protocol, we collected data on the participants' mood using the UMACL questionnaire and recorded their resting-state EEG. We focused on the effective connectivity patterns exerted by the dorso-lateral prefrontal cortex (dlPFC) over the temporal region (TMP), as these are important cortical structures involved in shaping mood. The cortical connectivity patterns in the resting-state EEG were evaluated using the directed transfer function (DTF), which is an autoregressive effective connectivity method. The results showed that both moderate-intensity exercise and high-intensity interval exercise improved participants' self-reported mood. Crucially, this improvement was accompanied by stronger influences of dlPFC over TMP. The observed changes in the effective connectivity patterns between dlPFC and TMP might help to better understand the effects of exercise on mood.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Physiological parameters analysis of transfemoral amputees with different prosthetic knees
Autorzy:: Li, Sujiao
Cao, Wujing
Yu, Hongliu
Meng, Qiaoling
Chen, Wenming
Tematy:: protetyka
kolano
mikroprocesor
chód
energia
transfemoral amputee
microprocessor-controlled prosthetic knee
energy cost
gait efficiency
relative exercise intensity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/306380.pdf Link otwiera się w nowym oknie
Opis:: Physiological parameters analysis allows for a precise quantification of energy expenditure of transfemoral amputees with different prosthetic knees. Comparative physiological parameters analysis that indicate the functional characteristics of knee joints is essential to the choice of transfemoral amputee. The aim of this study was to propose a microprocessor-controlled prosthetic knee (i-KNEE) and conducted physiological parameters (energy cost, gait efficiency and relative exercise intensity) comparison of transfemoral amputees with C-leg, Rheo Knee and Mauch under different walking speeds. Methodsː A microprocessor-controlled prosthetic knee with hydraulic damper (i-KNEE) was developed. A two-factor repeated measurement experiment design was used. Each subject was instructed to accept the same treatments. The two factors were type of prosthetic knees (the i-KNEE, the C-Leg, the Rheo Knee and the Mauch) and speed (0.5, 0.7, 0.9, 1.1, 1.3 m/s). The energy cost, gait efficiency and relative exercise intensity of ten transfemoral amputees were measured. Resultsː For all the prosthetic knees, the energy cost increased along with walking speed. There was no significant difference between three microprocessor-controlled prosthetic knees in energy cost. The gait efficiency of Mauch was always less than or equal to other three microprocessor-controlled prosthetic knees in specific walking speed. The relative exercise intensity increased with speed for all the prosthetic knees. More effort was needed for the transfemoral amputees with Mauch than other three microprocessorcontrolled prosthetic knees in the same walking speed. Conclusionsː The use of the microprocessor-controlled knee joints resulted in reduced energy cost, improved gait efficiency and smaller relative exercise intensity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: COMPARING THE SHORT AND LONG-TERM EFFECTS OF ACUTE MODERATE-INTENSITY EXERCISE ON MNEMONIC SIMILARITY AND RMOTIONAL MEMORY TASKS
Autorzy:: Acevedo-Triana, Cesar
Cordoba-Patiño, Diana
Muñoz, Juan Francisco
Cifuentes, Julian
Melgarejo Pinto, Victor
Rodriguez W, Oscar
Hurtado-Parrado, Camilo
Tematy:: exercise moderate-intensity
pattern separation
emotional memory
long term memory
young; Pokaż więcej
Wydawca:: Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
Powiązania:: https://bibliotekanauki.pl/articles/2137978.pdf Link otwiera się w nowym oknie
Opis:: Mounting research has linked acute moderate-intensity exercise with changes indiscrimination of similar events – i.e., mnemonic memory. Conversely, few studies have compared performance in tasks associated to each type of memory(mnemonic similarity and emotional) and less have evaluated performance several days after exercise sessions. Thirty-five undergraduate students were randomly distributed in three groups that differed in the assigned duration of the moderate-intensity ex- ercise session. We established first the moderate-intensity exercise program by calculating the VO2max 50%. Two-to-five days later, participants engaged in the exercise condition to which they were assigned, followed by a five-minute rest period. Immediately after, all participants were ex posed to the training phase of both memory tasks. The first retrieval phase was tested 45 minutes after encoding phase was completed. Subsequent retrieval phases were conducted 24, 48, and 168 hours post-training. Exercise of long duration increased discrimination performance in images of low similarity. Comparison of the effects of exercise on discrimination of the three types of images that the emotional-memory task entails showed improved performance only for aversive and neutral images. Exercise improves discrimination of low similarity images, with better overall perform- ance after a longer exercise session. This finding adds to previous reports that have found analogous effects using other memory tasks. It also supports the notion that acute effects due to exercise are specifically related to hippocampal functionality and its ability to separate patterns. Finally, maintenance of emotional informa- tion across time suggest a different mechanism, independent of pattern- separation processing. ----------------------------------------------------------------------------------------------------------------------------
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Assessment of selected muscle damage markers and zonulin concentration after maximum-intensity exercise in men with type 1 diabetes treated with a personal insulin pump
Autorzy:: Matejko, Bartłomiej
Tota, Łukasz
Pałka, Tomasz
Małecki, Maciej
Morawska-Tota, Małgorzata
Klupa, Tomasz
Opis:: Aim Exercise-induced muscle damage depends on exercise intensity and duration and on individual susceptibility. Mechanical and metabolic stress may disturb the intestinal microflora. The study evaluated selected muscle damage markers and zonulin concentration after maximum-intensity exercise in type 1 diabetes (T1D) men compared with healthy controls. Methods The study involved 16 T1D participants and 28 controls matched by age (22.7 [21.3–25.1] vs. 22.6 [20.9–26.3] years), body mass index (24.2 ± 1.6 vs. 24.2 ± 1.9 kg/m2), and body fat percentage (16.1 ± 5.2 vs. 14.9 ± 4.6%). The T1D group had 11.3 ± 5.1 years of diabetes duration and a suboptimal mean glycated haemoglobin level of 7.2 ± 1.1%. The subjects underwent a graded running treadmill test until exhaustion. Lactate concentration was assessed in arterialized blood at baseline and 3 and 20 min after the test. Cortisol, testosterone, tumour necrosis factor α, myoglobin, lactate dehydrogenase, zonulin, and vitamin D levels were evaluated in cubital fossa vein blood before and 60 min after the test. Results T1D patients presented higher baseline zonulin, myoglobin concentration, testosterone/cortisol ratio, and lower maximal oxygen uptake. On adjusting for the baseline values, the groups differed in zonulin, lactate dehydrogenase, and myoglobin levels, testosterone/cortisol ratio, and lactate concentration determined 20 min after exercise (P < 0.05). Conclusion Maximum-intensity exercise increased muscle and intestinal damage in T1D participants. In patients with lower physical activity, very-high-intensity exercise should be recommended with caution. Observing the anabolic-catabolic index may help individualize effort intensity in T1D individuals.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Mechanisms responsible for the acceleration of pulmonary \dot{V}o_{2} on-kinetics in humans after prolonged endurance training
Autorzy:: Żołądź, Jerzy A.
Grassi, Bruno
Majerczak, Joanna
Szkutnik, Zbigniew
Grandys, Marcin
Korostyński, Michał
Korzeniewski, Bernard
Jarmuszkiewicz, Wiesława
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Effects of 1-methylnicotinamide (MNA) on exercise capacity and endothelial response in diabetic mice
Autorzy:: Kij, Agnieszka
Przyborowski, Kamil
Sitek, Barbara
Zoladz, Jerzy Andrzej
Wojewoda, Marta
Chłopicki, Stefan
Zakrzewska, Agnieszka
Wandzel, Krystyna
Opis:: 1-Methylnicotinamide (MNA), which was initially considered to be a biologically inactive endogenous metabolite of nicotinamide, has emerged as an anti-thrombotic and anti-inflammatory agent with the capacity to release prostacyclin (PGI2). In the present study, we characterized the effects of MNA on exercise capacity and the endothelial response to exercise in diabetic mice. Eight-week-old db/db mice were untreated or treated with MNA for 4 weeks (100 mg·kg-1), and their exercise capacity as well as NO- and PGI2-dependent response to endurance running were subsequently assessed. MNA treatment of db/db mice resulted in four-fold and three-fold elevation of urine concentrations of MNA and its metabolites (Met-2PY + Met-4PY), respectively (P<0.01), but did not affect HbA1c concentration, fasting glucose concentration or lipid profile. However, insulin sensitivity was improved (P<0.01). In MNA-treated db/db mice, the time to fatigue for endurance exercise was significantly prolonged (P<0.05). Post-exercise Δ6-keto-PGF1α (difference between mean concentration in the sedentary and exercised groups) tended to increase, and post-exercise leukocytosis was substantially reduced in MNA-treated animals. In turn, the post-exercise fall in plasma concentration of nitrate was not affected by MNA. In conclusion, we demonstrated for the first time that MNA improves endurance exercise capacity in mice with diabetes, and may also decrease the cardiovascular risk of exercise.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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