Wyniki wyszukiwania - Biblioteka Nauki

1

The Conconi Test - Searching for the Deflection Point

100%

Hnizdil J. , Skopek M. , Nosek M. , Louka O. , Musalek M. , Heller J.

Physical Activity Review

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2019

|

nr 7

160-167

EN

The Conconi Test (CT) is an incremental exercise test characterized by stages of equal intensity. For analysis speed (S) and HR (heart rate) are used. The deflection point of the HR/S graph marks the point where the linear relation between S and HR changes to a curvilinear one. As Conconi stated HR at deflection point represents anaerobic threshold (AT) value. Purpose of this study was to extend our previous research dealing with reliability and validity aspects of CT. Material and Methods: During 10 years (2007-2017) we tested 2 500 subjects using Conconi protocol. Tested were mainly football players and smaller number of runners (long distance and cross country) different ages and fitness level. Some subjects were tested repeatedly during the years. Initial speed of the running treadmill test was determined in the range of 10 to 12 km·h-1, according subjects age and fitness level. Speed was increased gradually every 150 m of 0.5 km·h-1 to the maximum speed when further increases were impossible. HR was recorded at every 150 meters. From a graphical representation dependence HR on increasing running speed we tried to find apparent diversion from the curve of linearity, labeled by Conconi as "deflection point" (DP). Simultaneously respiration values were recorded. From these respiration data we determined the ventilatory threshold (VT2) as a metabolic marker of the onset of blood lactate accumulation. Results: We found 6 types of response HR to increasing speed. a) regular DP; b) linear regression r ≥ 0.98 - no DP; c) linear regression r < 0.98 - no DP; d) inversion character of deflection point; e) DP not corresponding with value of ANP; f) more than one DP. As an AT predictor compared with VT2, Conconi test overestimated this value (0.5 km·h-1). Conclusion: Using of Conconi test as a predictor of ANP has a limitation. ANP values determined by CT are overestimated (0.5 km·h-1). Test stability of CT is very low and there is evidence that DP is not 100% repeated physiology phenomena.

2

Heart rate variability – clinical significance87

100%

Urbanik D. , Podgórski M. , Mazur G.

Family Medicine & Primary Care Review

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2018

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nr 1

87-90

3

The Effect of Fatigue on the Kinematics of Free Throw Shooting in Basketball

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Uygur M. , Goktepe A. , Ak E. , Karabörk H. , Korkusuz F.

Journal of Human Kinetics

|

2010

|

tom 24

51-56

EN

Fatigue is an indispensible part of a basketball game which may affect an athlete's shooting kinematics. Although kinematic analyses of various sports related movements were extensively done, this study is the first to consider the effects of fatigue on the kinematics of free throw shooting. After measuring the resting heart rate, ten collegiate level, male basketball players (21.8±1.6 y; 192.8±3.6 cm; 84.1±8.5 kg) were asked to perform free throws. Two successful and two unsuccessful free throws were selected. Thereafter, participants were asked to complete the fatigue protocol, which included 30m sprints and 5 vertical jumps at each end, until they reached volitional exhaustion. Additional two successful and two unsuccessful free throws were collected. All shots were recorded by using two digital cameras operating at 60 Hz and placed in a stereoscopic view. The elbow, trunk, knee and ankle joint angles were measured before and after the ball release and at the ball release point. The selected joint angles were compared between successful and unsuccessful free throws, as well as before and after the completion of fatigue protocol. The results demonstrated that fatigue did not effect free throw shooting kinematics (p>0.05) and there was no significant joint angle difference between successful and unsuccessful shots (p>0.05). This study suggested that high level athletes are able to cope with the possible detrimental effects of fatigue while performing coordinated movements such as free throw shooting.

4

Oxygen Consumption While Standing with Unstable Shoe Design

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Gasser B. A. , Stäuber A. M. , Lurmann G. , Breil F. A. , Hoppeler H. H. , Vogt M.

Human Movement

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2014

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tom 15

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nr 3

160-165

EN

Purpose. This study explored the effects of unstable shoe design on oxygen consumption. Methods. Oxygen consumption (VO2) and heart rate (HR) were measured in 16 individuals while barefoot, wearing unstable shoes (Masai Barefoot Technology) and wearing conventional sport shoes while standing and walking on a treadmill and for 5 individuals while walking around a 400 m track. Results. When wearing the MBT shoes, a significant (p < 0.01) increase of 9.3 ± 5.2% in VO2 was measured while standing quietly for 6 min. No differences in VO2 and HR were observed between the MBT shoes or weight-adjusted conventional shoes (to match the weight of the MBT shoes) while walking on a treadmill. However, significant increases (p < 0.01) in VO2 (4.4 ± 8.2%) and HR (3.6 ± 7.3%) were observed for the MBT shoes compared with being barefoot. No significant differences in VO2 and HR were recorded while walking around a 400 m track either with MBT shoes, weight-adjusted conventional shoes or barefoot. Nonetheless, a comparison of the MBT shoes with barefoot revealed a tendency for VO2 to be higher when wearing the MBT shoes (7.1 ± 6.5%, p < 0.1) although HR was not significantly affected. Conclusions. The unstable shoe design predominantly effects oxygen consumption while standing, most likely due to increased muscle activity of the lower extremities.

5

Monitoring of the cardiac activity of the Baltic isopod Saduria entomon exposed to hypoxia, using non-invasive, computer-aided techniques

100%

Miąc J.

Oceanological Studies

|

2001

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tom Vol. 30, No. 3-4

115-124

EN

The repertoires of physiological responses which invertebrates possess play a major role in determining their distribution and survival potential. In the present study the effect of severe hypoxia on the heart rate of S. entomon has been investigated. Saduria entomon are often exposed to extended periods of severe hypoxia and anoxia in their natural habitats. The animals were exposed to conditions of a reduced level of oxygen ( 10% O2 saturation) for 24 hours. The experiment confirms that the pattern of their heart rate changed considerably with time and experimental condition. Under hypoxic condition a steady, regular heart rate was observed and the variability of beat rate decreased in comparison with normoxic one. The mean heart rate of the unburied animals in normoxia was higher than that of the buried S.entomon with considerably lower inter-individual variability. The mean heart rate of animals in hypoxic conditions was similar for all individuals (41.66 ą 2.03 (mean ą SD)), but not significantly different in normoxic conditions (Student t-test, p 0.05).

6

Changes of Lactate Threshold during a Half-Year Training Cycle in "Arka Gdynia" Football Players

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Ignatiuk W. , Rompa P. , Radzimiński Ł. , Dargiewicz R. , Jastrzębski Z.

Baltic Journal of Health and Physical Activity

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2010

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tom 2

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nr 2

104-112

EN

Background: The aim of this study was to assess lactate threshold changes during a half-year training cycle in S.S.A. "Arka Gdynia" football team.Material/Methods: The research was conducted on a sample of 17 "Arka Gdynia" Football Club players. The subjects participated in premier league competitions in autumn 2009/10 season. Apart from league matches (17) the players took part in Remes Polish Cup (2 matches). Aerobic capacity tests were conducted at the beginning of the summer preparatory season (test 1 - 27th June 2009), during the competitive season (test 2 - 2nd September 2009) and at the beginning of the winter preparatory season (test 3 - 13th January 2010). The players underwent an incremental running test. Running speed (V/LT) and heart rate (HR/LT) at the lactate threshold were determined.Results: An analysis of mean running speed values at LT intensity in each study confirms that during the first two tests participants achieved the same mean value of the ratio V/LT (3.80 m/s). The last test revealed a regression of the results by 0.17 m/s. The lowest standard deviation (± 0.20 m/s) was observed in the first study, which indicates that the diversity of the group was the smallest.Conclusions: Goalkeepers achieved statistically lower (p<0.05) values of running speed at the intensity corresponding to the anaerobic threshold (V/LT) in relation to field players.

7

The pattern of psychophysiological response to emotional stimulation in patients with chronic stuttering

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Humeniuk E. , Tarkowski Z.

Acta Neuropsychologica

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2020

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tom 18(1)

45-66

EN

The aim of the research was to identify the pattern of psycho - physiological response to emotional stimulation in adults with chronic stuttering. The need to tell a lie functioned as emotional stimulation. Reaction to the stimulus was defined as the change of electrodermal activity (EDA), heart rate (HR), thoracic breathing (TB), diaphragmatic breathing (DB) and respiratory rate (RR) observed 10 seconds before and after the emotional stimulation. Reactions were recorded using Professional Computer Polygraph PIK-02 manufactured by Areopag-Center. The subject group included 68 persons with chronic stuttering (PWS) (24 women and 44 men) as well as 62 healthy nonstuttering persons (PWNS) (18 women and 44 men). Adult patients with chronic stuttering were observed to increase the amplitude and reaction field as well as reduce the EDA latency. The researchers also noticed both increased HR and the range of its changes. Respiratory reactions included a lower amplitude of TB, higher increase and major changes within DB as well as minor changes in RR. Adult patients with chronic stuttering display a unique pattern of psychophysiological response to emotional stimulation, which is different from the one found in the control group.

8

Effect of yoga in the modulation of heart rate variability in patients with breast cancer

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Odynets T. , Briskin Y. , Todorova V. , Tyshchenko V. , Bondarenko O.

Advances in Rehabilitation

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2019

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tom 33

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nr 4

5-11

EN

Introduction The aim of this study was to examine the effect of yoga on heart rate variability in patients with breast cancer in an outpatient rehabilitation program. Material and methods Eighty-four patients with breast cancer were eligible for this study. After the exclusion of 7 women, 77 participants were randomly allocated to a yoga exercise program (group A, n=33) and Pilates exercise program (group B, n=44). Heart rate variability parameters were evaluated at baseline, after six and twelve months of yoga exercises. Results After twelve months of performing yoga exercises, standard deviation of the normal-to-normal intervals (SDNN) improved by 5.53 ms (p<0.001), square root of the mean of the squared differences between adjacent normal RR interval (RMSSD) improved by 4.91 ms (p<0.01), total power (TP) improved by 279.78 ms2 (p<0.001), very low frequency (VLF) improved by 109.76 ms2 (p<0.01), low frequency (LF) improved by 88.38 ms2 (p<0.01), high frequency (HF) improved by 77.60 ms2 (p<0.05), and stress index (Si) improved by 137.24 c.u. (p<0.01). Based on the results after 12 months, women in group A showed significantly better results compared to group B in SDNN by 3.28 ms (p<0.05), RMSSD by 3.34 ms (p<0.05), TP by 170.33 ms2 (p<0.05), HF by 64.33 (p<0.05), and Si by 56.49 c.u. (p<0.05). Conclusions Performing the yoga exercise program resulted in an increase of the parasympathetic and baroreflex effects on the cardiovascular system and a decrease in the tonic effects of the sympathetic nervous system. Yoga should be considered as an effective tool in normalizing the functional state of the autonomic nervous system.

9

Assessment of the Influence of Cervical Spine Traction on the Change of Heart Hemodynamic Parameters

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Myśliwiec A. , Saulicz E. , Kuszewski M. , Klapuch M.

Physiotherapy and Health Activity

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2014

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tom 22

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nr 1

15-20

EN

Background: The vast majority of pain dysfunctions of the cervical spine is underlain by prolonged overload and one effective therapy is traction. The aim of this study is to assess the influence of cervical spine traction on changes in heart rate and arterial blood pressure in people with arterial hypertension and normotension. Material/Methods: The study involved a total of 168 patients, in whom chronic cervical spine pain syndrome of low intensity, with no radiation of symptoms and with no significant functional limitations occurred. The subjects were intentionally allocated into a group with arterial hypertension and a group with normotension. Results: The analysis of the obtained results showed that cervical spine traction does not strain the cardiovascular system. In the group of subjects with arterial hypertension, a linear value reduction of all the heart hemodynamic parameters measured in the successive trials was observed. The most significant difference between the initial and final test was observed in patients, in whom the traction procedure was only simulated. Conclusions: Cervical spine traction performed according to D. Saunders’ method does not constitute any threat to patients with arterial hypertension.

10

A Comparison of the Physiological Responses to Underwater Arm Cranking and Breath Holding Between Synchronized Swimmers and Breath Holding Untrained Women

100%

Alentejano T. , Bell G. , Marshall D.

Journal of Human Kinetics

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2012

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tom 32

147-156

EN

Exercise and breath holding in the water such as that performed in the sport of synchronized swimming may evoke the physiological consequences of the diving response. The purpose of this study was to investigate the physiological responses of breath holding during underwater arm cranking in synchronized swimmers who are trained in breath holding and compare these responses to untrained women. Each participant performed 6 breath holding periods in the water (2 × 10s, 2 × 20s and 2 × 25s) with 2 minutes of normal breathing in between, in either an ascending or descending order while performing arm crank exercise. The intensity of arm crank exercise was set below the individual ventilatory threshold. Both synchronized swimmers and controls were matched on sitting height and then randomly divided into 2 groups: one group started breath holding with the longest (25s) breath holding periods while the other group began breath holding with the shortest (10s) breath holding periods. The synchronized swimmers experienced a significant decrease in heart rate while breath holding for 20 and 25s but the changes in heart rate for the control group was not consistent between subgroups. Full recovery from breath holding was identified for minute ventilation after 25s of recovery from breath holding for all groups. Results suggest synchronized swimmers exhibited a better adaptation to breath holding while exercising underwater.

11

Characteristics of body tissue composition and functional traits in junior football players

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Burdukiewicz A. , Chmura J. , Pietraszewska J. , Andrzejewska J. , Stachoń A. , Nosal J.

Human Movement

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2013

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tom 14

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nr 2

96-101

EN

Purpose The aim of this study was to examine the body tissue composition and functional traits of young football players. Methods. Analysis was performed on 23 junior football players. Body mass and height were measured. Bioelectrical impedance was used to assess the players’ body composition (fat mass, muscle mass, body cell mass and extracellular mass). The body mass index, body cell mass index and the extracellular mass/body cell mass ratio were also calculated. Functional traits were assessed by a one-on-one football game in an enclosed space with the objective to score the highest number of goals in a timed setting. Measurements of HRrest, HRmax and heart rate reserve were used to evaluate the efficiency of the subjects’ cardiovascular systems. Results. Insignificant differences in body tissue composition and cardiovascular efficiency were found regardless of what position was played. Overall, forwards were characterised by having the greatest height, the highest level of active body tissue development and the most efficient cardiovascular systems. Defenders were characterised by having larger body build, while midfielders displayed a significantly greater percentage of extracellular mass and EMC in relation to BC M. Conclusions. The results reveal that trends exist in the body tissue composition and cardiovascular efficiency of football players depending on which position they play. These differences reflect the varied physical efforts players perform during a match and should be taken into consideration when designing training programmes.

12

Changing difficulty level in a one-dimensional tracking task and corresponding heart rate changes

100%

Bohdanecky Z. , Indra M. , Radil T.

Acta Neurobiologiae Experimentalis

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1995

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tom 55

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nr 1

13

Interpreting as a stressful activity: physiological measures of stress in simultaneous interpreting

88%

Korpal P.

Poznań Studies in Contemporary Linguistics

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2016

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tom 52

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nr 2

297-316

EN

The question of interpreter aptitude has been widely discussed in Interpreting Studies (e.g. Lambert 1991; Moser-Mercer 1994; Mackintosh 1999). Language command and cognitive skills have often been treated by interpreter trainers as the main determinants of an interpreter’s future success. However, in recent years, more and more attention from interpreting scholars has been devoted to psycho-affective factors, such as motivation, anxiety or stress resistance (e.g. Timarová and Ungoed-Thomas 2008; Rosiers et al. 2011; Bontempo and Napier 2011). This paper presents the results of a pilot study, the main objective of which was to examine whether the speed of speaker’s delivery influences the level of stress experienced by interpreting trainees during a simultaneous interpreting task. To this end, heart rate and blood pressure data were collected. The participants were asked to interpret two speeches from English into Polish. The author hypothesised that while interpreting a faster speech the participants would experience a higher level of stress than when they interpreted a slower speech. The hypothesis was corroborated only for heart rate values. No statistically significant differences were observed for either systolic or diastolic blood pressure. The study offers valuable insight into the question of stress experienced by interpreting trainees.

14

Evaluation Of Emotional State, Heart Rate Frequency And Skiing Technique In Ski Hiking

88%

Nikonovs I. , Grants J. , Kravalis I.

Polish Journal of Sport and Tourism

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2015

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tom 22

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nr 1

41-45

EN

Introduction. The aim of this study was to assess selected psychological, physiological and technical factors related to ski hiking in order to offer some recommendations for ski hikers and ski hike organisers. Material and methods. The hike lasted 8 hours and the hikers covered a distance of 24 kilometres. The ski hikers' emotional state was assessed three times: before the ski hike, 1 hour after the hike and 16 hours after the hike. Their skiing technique was evaluated during the first part of the hike and at the end of the hike. The heart rate of the skiers was recorded over the course of the hike. The data were then processed and analysed statistically. Results. When comparing the data collected for the selected factors during the ski hike, some significant correlations were found. A significant correlation was observed between the level of fear experienced before the ski hike and cycle length for the diagonal stride (r=−0.791, p<0.05), which meant that the hikers with poorer ski technique felt more afraid before the hike. However, these hikers also showed lower levels of sadness 16 hours after the hike (r=0.804, p<0.05). A significant negative correlation (r=−0.849, p<0.05) was found when comparing the average heart rate frequency and the level of anger experienced after the hike, that is the hikers who had a lower heart rate were angrier after the hike. The results helped to develop some important recommendations for ski hikers and ski hike organisers.

15

CEREBRAL LATERALITY, EMOTION, AND CARDIOPULMONARY FUNCTIONS: AN INVESTIGATION OF LEFT AND RIGHT CVA PATIENTS

88%

Comer C. S. , DeVore B. B. , Harrison P. K. , Harrison D. W.

Acta Neuropsychologica

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2017

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tom 15(3)

257-282

EN

Background: It has been evidenced that the outcome of a CVA patient differs as a function of the cerebral hemisphere that is damaged by the stroke, especially in terms of emotional changes. In contrast, the Bi-Hemispheric Model of Emotion posits that each hemisphere has its own emotional specialization. The current experiment tested the competing predictions of the two theoretical perspectives in a mixed sample of left cerebrovascular accident (LCVA) patients and right cerebrovascular accident (RCVA) patients using a Dichotic Listening task and the Affective Auditory Verbal Learning Test (AAVLT). Heart Rate (HR) and Pulse Oxygen Saturation (SpO2) were recorded as sympathetic measures. It was expected that the predictions of the Bi-Hemispheric Model would be supported. A series of mixed design ANOVAs were used to analyze the data. Material/Methods: Participants consisted of 21 patients grouped into either post-acute status left cerebrovascular accident (LCVA) or right cerebrovascular accident (RCVA). Tests included the The Dichotic Listening test, The Affective Auditory Verbal Learning Test (AAVLT), HR and Sp02 measurement using a Fingertip Pulse Oximeter and the Mood Assessment Scale for depression. Results: Results revealed that both groups exhibited decreased auditory detection abilities in the ear contralateral to CVA location. Additionally, CVA patients recalled significantly more positive words than negative or neutral words and exhibited a significant learning curve. LCVA patients exhibited a recency effect, while RCVA patients exhibited a heigh tened primacy effect. Findings from the HR and Sp02 measures suggested a parasympathetic response to emotionally neutral information as well as an impaired sympathetic response to emotionally negative information in RCVA patients. Conclusions: The results lend partial support to the hypothesis drawn from the Bi-Hemispheric Model of Emotion, as evidenced by the diametrically opposite effects in these groups, which reflects opposing cerebral processes.

16

The art equipment for measuring the horse’s heart rate

88%

Janzekovic M. , Prisenk J. , Mursec B. , Vindis P. , Stajnko D. , Cus F.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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tom Vol. 41, nr 1-2

180-186

EN

Purpose: of this paper: Heart rate is a reliable indicator of the stress. Non-invasive methods have advantage over the methods that have a negative influence on the condition of an animal. When breeding sport horses, which undergo stressful training every day, it is required, from an ethical aspect, to monitor their capabilities by using most advanced electronic devices Polar Sport Tester and Polar Equine RS800cx G3. Design/methodology/approach: The original Polar ProTrainer 5 Equine edition software facilitates the analysis of individual training phases and gives the number of heart beats, average heart rate, average speed and distance covered in individual training phases. Findings: Heart rate increased, in warming up phase, from the value associated with a resting horse (30 to 40 bpm) approximately in one minute, while, during the slow cooling down phase, ten minutes were required for the heart rate to reach the afore-mentioned value. During quick trotting heart rate are 112 heart beats per minute, while during steeplechase phase, it increased to the value of 160 to 170 heart beats per minute. Research limitations/implications: To receive heart rate without disturbances already we moisten the skin on the contact spots, using a mixture of water and electrolytes (Salvana Nutrilyt). Placing receiver on the saddle close by the T56H transmitter was the optimal choice. Practical implications: Modern equipment makes monitoring the horse’s heart rate accurately and to perform, safely and without disturbances, exercises required during training. It also checks the heart rate, which indicates the horse’s health. Originality/value: Polar Sport Tester and Polar Equine RS800cx G3 are state of the art products that facilitate the receipt of the horse’s heart rate signals. The accuracy of the acquired results can be compared with those obtained with ECG measurements.

17

EXECUTIVE FUNCTION AND MEMORY FOR THE REY-OSTERREITH COMPLEX FIGURE TASK: RELATIONSHIP BETWEEN GENDER, HEART RATE AND NEUROPSYCHOLOGICAL PERFORMANCE IN MOROCCAN STUDENT SAMPLE

88%

Salim E. M. , Touhami Ahami A. O. , Oudda H. , Ahmadou T. M.

Acta Neuropsychologica

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2022

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tom 20(1)

35-51

EN

The present study has been conducted to investigate the visuospatial constructive cognition and memory among healthy students, as measured by the Rey Complex Figure Test (RCFT). We have compared the data used to draw the figures with the hypothesis that gender and physiological measurements have an impact on neuropsychological skills. One hundred twenty-five students (43 male, 82 female; age 18–32 years) participated in this study with a computerized numerical recording of the digital plot of the RCFT and a set of socio-demographic variables. Results revealed that visual perception and working memory were impacted by social and health determinants. Additionally, this study presents evidence supporting the implication of resting heart rate (RHR) and organizational strategy in working memory performance. Gender effect seems to be significant in physical and physiological differences. Regression analyses revealed a relevant contribution of study institution and sleep time on RCFT Copy score; RCFT Memory predicted by drawing from memory strategy, RHR, periodic medication use and marital status.

18

Changes in the Blood Pressure, Heart Rate and Body Mass of Physically Active Men in Response to Thermal Stress

88%

Podstawski R. , Bielec G. , Borysławski K. , Alföldi Z. , Marzec A.

Central European Journal of Sport Sciences and Medicine

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2022

|

tom 37

65-76

EN

Background: Finnish sauna is presently the most popular type of thermal therapy in Europe. Saunas are widely available in aquaparks, SPA centers and hotels. In Scandinavian countries sauna is regarded not only as a form of treatment, but as a part of the national lifestyle. Objective: The aim of this study was to evaluate sauna-induced changes in systolic (SBP) and diastolic blood pressure (DBP), heart rate (HR) and body mass in healthy men. Methods: Thirty healthy men aged 20-49 years (mean age: 31.2±11.3 years) attended four 12-minute Finnish sauna sessions (temperature: 90°C, humidity: 14-16%) with 6-minute breaks in between sessions, including cold water immersion for 1 minute. The participants’ physical activity (PA) levels were evaluated with an IPAQ questionnaire. Sauna bathers’ body composition, BP and HR were measured before the first and after the fourth sauna session. Results: A significant (p < .001) decrease in SBP and DBP values was noted in response to sauna regardless of the bathers’ body mass, age and PA levels. The average HR increased significantly in younger, slimmer and more physically active participants. Sauna treatment induced a significant decrease in body mass loss regardless of all independent variables. Conclusions: Repeated 12-minute Finnish sauna sessions have a beneficial influence on the cardiovascular system. Finnish sauna can be recommended for healthy men with average and high PA levels as a means of decreasing BP. Body mass loss, on the other hand, is related to the loss of body fluids as a result of sweating.

19

Offshore Fleet Workers and the Circadian Adaptation of Core Body Temperature, Blood Pressure and Heart Rate to 12-h Shifts: A Field Study

88%

Hansen J. H. , Geving I. H. , Reinertsen R. E.

International Journal of Occupational Safety and Ergonomics

|

2010

|

tom Vol. 16, No. 4

487--496

EN

Objectives. The aim of this study was to investigate the circadian adaptation of tcr (core body temperature), BP (blood pressure), HR (heart rate) and subjective sleep quality after 7 days of working 12-h night shifts in offshore fleet workers. Methods. Night workers (N = 7) (18:00–6:00) and day workers (N = 7) (6:00–18:00) were recruited from a Norwegian offshore company operating in the North Sea. We measured tcr, BP and HR on days 1 and 7. Results. An increase of 0.6 oC (p = .03) was observed within the group of night workers from day 1 to day 7. Between the night and day workers there was a significant difference of 0.6 oC from day 1 to day 7 (p = .01). Sleep latency and sleep length also showed significant differences between the groups (p = .01 and p = .04). There was an interaction effect in tiredness during the shift (p = .02). Conclusion. The significant increase in tcr indicates an adaptation in the night workers to the new working schedule, and the extended working hours and sleep deprivation are hypothesized to be the main cause of the increased tcr. Light exposure, altered pattern of food availability and physical activity are likely to have contributed as well. Subjective sleep quality showed inconclusive results.

20

Heart-rate Monitoring System Design and Analysis Using a Nios II Soft-core Processor

88%

Lim C. K. , Jambek A. B. , Hashim U.

International Journal of Electronics and Telecommunications

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2016

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tom Vol. 62, No. 3

283--288

EN

The heart rate of a person is able to tell whether they are healthy. A heart-rate monitoring device is able to measure or record the heart rate of a person in real time, whether it is an electrocardiogram (ECG) or a photoplethysmogram (PPG). In this work, a microprocessor system loaded with a heart-rate monitoring algorithm is implemented. The microprocessor system is the Nios II processor system, which interfaces with an analogue-to-digital converter (ADC) and a pulse sensor. A beat-finding algorithm is used in the microprocessor system for heart rate measurement. An experiment is carried out to analyse the functionality of the microprocessor system loaded with the algorithm. The results show that the detected heart rate is in the range of the average human being’s heart rate. The signal flow within the microprocessor system is observed and analysed using SignalTap II from Quartus’ software. Based on a power analysis report, the proposed microprocessor system has a total power dissipation of around 218.26 mW.