Is the Polar M430 a Valid Tool for Estimating Maximal Oxygen Consumption in Adult Females?

2021 ◽  
pp. 1-7
Author(s):  
Kevin E. Miller ◽  
Timothy R. Kempf ◽  
Brian C. Rider ◽  
Scott A. Conger
Keyword(s):  
Oxygen Consumption ◽  
Repeated Measures ◽  
Maximal Oxygen Consumption ◽  
Prediction Algorithm ◽  
Heart Rate Monitors ◽  
Mean Values ◽  
Healthy Female ◽  
The Mean ◽  
Study Participants ◽  
Treadmill Protocol

Background: Previous research studies have found that heart rate monitors that predict maximal oxygen consumption () are valid for males but overestimate in females. Inaccurate self-reported physical activity (PA) levels may affect the validity of the prediction algorithm used to predict . Purpose: To investigate the validity of the Polar M430 in predicting among females with varying PA levels. Methods: Polar M430 was used to predict () for 43 healthy female study participants (26.9 ± 1.3 years), under three conditions: the participant’s self-selected PA category (sPA), one PA category below the sPA (sPA − 1), and one category above the sPA (sPA + 1). Indirect calorimetry was utilized to measure () via a modified Astrand treadmill protocol. Repeated-measures analyses of covariance using age and percentage of body fat as covariates were used to detect differences between groups. Bland–Altman plots were used to assess the precision of the measurement. Results: was significantly correlated with (r = .695, p < .001). The mean values for and were 44.58 ± 9.29 and 43.98 ± 8.76, respectively. No significant differences were found between , , sPA – 1, and sPA + 1 (p = .492). However, the Bland–Altman plots indicated a low level of precision with the estimate. Conclusions: The Polar M430 was a valid method to predict across different sPA levels in females. Moreover, an under/overestimation in sPA had little effect on the predicted .

Changes in multiple sclerosis symptoms are associated with changes in work productivity of people living with multiple sclerosis

2021 ◽  
pp. 135245852199455
Author(s):  
Barnabas Bessing ◽  
Mohammad A Hussain ◽  
Suzi B Claflin ◽  
Jing Chen ◽  
Leigh Blizzard ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Mixed Models ◽  
Repeated Measures ◽  
Work Productivity ◽  
Annual Change ◽  
Individual Variations ◽  
Unit Increase ◽  
The Mean ◽  
Employment Rates ◽  
Study Participants

Background: While employment rates have increased in people with multiple sclerosis (PwMS), little is known about the longitudinal trends of work productivity. Objective: To describe the longitudinal patterns of work productivity and examine the factors associated with annual change of work productivity of PwMS. Methods: Study participants were employed participants of the Australian MS Longitudinal Study (AMSLS) followed from 2015 to 2019 with at least two repeated measures ( n = 2121). We used linear mixed models to examine if the within-individual variations in MS symptoms are associated with changes in work productivity. Results: The mean annual change in work productivity between 2015 and 2019 was −0.23% ( SD = 18.68%). Not the actual severity of symptoms but rather the changes in severity of symptoms that are associated with change in work productivity in the same year. In a multivariable model, every unit increase in mean annual change in ‘pain and sensory symptoms’, ‘feelings of anxiety and depression’, and ‘fatigue and cognitive symptoms’ were independently associated with 2.43%, 1.55% and 1.01% annual reductions in work productivity, respectively. Conclusion: Individual changes in work productivity are largely driven by the changes in symptom severity rather than the absolute severity. Stabilising/improving MS symptoms might improve work productivity.

Physical training and heart rate and blood pressure variability: a 5-yr randomized trial

2004 ◽  
Vol 286 (5) ◽  
pp. H1821-H1826 ◽  
Author(s):  
Arja L. T. Uusitalo ◽  
Tomi Laitinen ◽  
Sari B. Väisänen ◽  
Esko Länsimies ◽  
Rainer Rauramaa
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Oxygen Consumption ◽  
Blood Pressure Variability ◽  
Maximal Oxygen Consumption ◽  
Final Analysis ◽  
Peak Performance ◽  
Autonomic Modulation ◽  
The Mean ◽  
Time Point

We studied the effect of regular physical activity on cardiac and vascular autonomic modulation during a 5-yr controlled randomized training intervention in a representative sample of older Finnish men. Heart rate variability (HRV) and blood pressure variability (BPV) are markers of cardiac and vascular health, reflecting cardiac and vascular autonomic modulation. One hundred and forty randomly selected 53- to 63-yr-old men were randomized into two identical groups: an intervention (EX) group and a reference (CO) group, of which 89 men remained until the final analysis (EX: n = 47; CO: n = 42). The EX group trained for 30–60 min three to five times a week with an intensity of 40–60% of maximal oxygen consumption. The mean weekly energy expenditure of the training program for the 5-yr training period was 3.80 MJ, and 71% of the EX group exceeded the mean. The EX group had a significantly ( P < 0.01) higher oxygen consumption at ventilatory aerobic threshold (V̇o2VT) than the CO group at the 5-yr time point. V̇o2VT had a tendency to increase in the EX group and decrease in the CO group (interaction P < 0.001) from the baseline to the 5-yr time point. Peak performance did not change. Low-frequency power of R-R interval variability decreased in the EX group ( P < 0.01, by 6%) from the baseline to the 5-yr time point. BPV did not change. In conclusion, low-intensity regular exercise training did not prevent HRV from decreasing or change BPV in 5 yr in older Finnish men.

scholarly journals Body composition and maximal oxygen consumption in adult soccer players in the Republic of Macedonia

2015 ◽  
Vol 5 (3) ◽  
pp. 85-92
Author(s):  
Jasmina Pluncevikj Gligoroska ◽  
Sanja Manchevska ◽  
Ljudmila Efremova ◽  
Lidija Todorovska ◽  
Slobodan Nikolic
Keyword(s):  
Body Composition ◽  
Oxygen Consumption ◽  
Muscle Mass ◽  
Body Mass ◽  
Body Fat ◽  
Maximal Oxygen Consumption ◽  
Age Groups ◽  
Total Sample ◽  
Soccer Players ◽  
Mean Values

Introduction: The purpose of this study was to investigate the relationship between active and passive body mass components and maximal aerobic consumption (VO2max) in adult male soccer players.Methods: The study involved seven hundred (700) male soccer players, mean age 25.06 ± 4.41 years (range 18 to 35), divided in six age groups. Body composition was assessed according the anthropometric protocol by Matiegka, and relative muscle mass (MM%), bone (BM%) and fat (BF%)  and absolute muscle mass (MMkg), bone (BMkg) and fat (BFkg) components were calculated. The Bruce protocol (incremental multistage treadmill test) was used for the estimation of maximal oxygen consumption.Results: Mean values of body mass components for total sample were as follows: muscle mass (MM%)= 52.75 ± 2.63%, bone mass (BM%)=16.63 ± 1.29% and body fat (BF%)=14.12 ± 1.54%.  Mean VO2max was 48.89±5.17 ml/kg/minute. Relative muscle mass (MM%) showed similar values across age different groups (ANOVA: F=2.174; p=0.06) while absolute muscle mass (MMkg) showed tendency of increment with age (ANOVA: F=2.136; p=0.01). Body fat (BFkg and BF%) was statistically higher in the older groups (ANOVA F=3.737; p<0.01; ANOVA F=4.117; p<0.01). Weak positive correlation between VO2 max and muscle component (r=0.243; p<0.001) and a weak negative correlation between VO2max and body fat (r=-0.08;p<0.05) were found.Conclusions: Our results confirm the assumption that subjects with larger muscle mass have greater endurance and higher maximal oxygen consumption compared to subjects with larger body fat component. 

scholarly journals Effectiveness Of Structured Training Programme Regarding Adult Basic Life Support On Knowledge Of Nurses` In Zoba Maekel And National Referral Hospitals, Eritrea, 2018.

2020 ◽  
Author(s):  
Filmon Abraham Ghirmai ◽  
Ghidey Ghebreyowhanness Weldeghiorgis ◽  
Teklu Tsegay Bahlebi ◽  
Eyasu Habte Tesfamariam
Keyword(s):  
Repeated Measures ◽  
Basic Life Support ◽  
Life Support ◽  
Critical Role ◽  
Study Participant ◽  
Training Programme ◽  
Pass Mark ◽  
The Mean ◽  
Study Participants ◽  
Nurses Knowledge

Abstract Background: In Eritrea nurses provide most of the health care in the primary, secondary and tertiary level health facilities. The rate of trauma and medical emergencies are on the increase so nurses should have adequate and updated knowledge on Basic Life Support in order to be able to implement effective interventions in cardiac arrest situations. Aim: The objective of this study was to assess the effectiveness of structured training programme regarding Adult Basic Life Support on knowledge of nurses.Method: A quasi-experimental single group, pretest-posttest and retest design was utilized. Forty (40) nurses’ participated in the study. Structured and modified questionnaire was used to collect data.Data were analyzed using the Statistical Package for Social Sciences (SPSS) Version 22.0 program. Frequencies, percentages, mean and standard deviation was used to describe the data. One way repeated measures of ANOVA was used to check the possible change in knowledge of the nurses at pre- intervention, immediate and three months’ after intervention. A p-value < 0.05 was considered to be statistically significant.Results: The findings showed an acquisition of Adult Basic Life Support knowledge among the study participants following a four hour Basic Life Support training programme. Before training, the mean score of the study participant on knowledge questions was 9.58/20 and none of the respondents got a pass mark. Immediately after the training the mean score of the study participants was increased to 15.9/20 and 55.0% of the study participant got a passing mark. Significant deterioration from the immediate training score was found three months following Basic Life Support training as score was decreased to 14.9 and 40% of the respondents got a pass mark. Nurses’ knowledge was improved from their pre-training scores, which clearly indicated a positive retention in Basic Life Support knowledge after training. Conclusions: The study findings present strong evidence that support the critical role of structured training programme about Adult Basic Life Support in improving nurses knowledge.

scholarly journals Caffeine effects on velocity selection and physiological responses during RPE production

2016 ◽  
Vol 41 (10) ◽  
pp. 1077-1082 ◽  
Author(s):  
James M. Green ◽  
Alyssa Olenick ◽  
Caroline Eastep ◽  
Lee Winchester
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Repeated Measures ◽  
Perceived Exertion ◽  
Statistical Significance ◽  
Maximal Oxygen Consumption ◽  
Ratings Of Perceived Exertion ◽  
Caffeine Ingestion ◽  
Recreational Runners ◽  
Velocity Selection

Caffeine (CAF) blunts estimated ratings of perceived exertion (RPE) but the effects on RPE production are unclear. This study examined effects of acute caffeine ingestion during treadmill exercise where participants exercised at prescribed RPE 4 and 7. Recreational runners (maximal oxygen consumption = 51.4 ± 9.8 mL·kg−1·min−1) (n = 16) completed a maximal treadmill test followed by trials where they selected treadmill velocity (VEL) (1% grade) to produce RPE 4 and RPE 7 (10 min each). RPE production trials followed CAF (6 mg·kg−1) or placebo (PLA) (counterbalanced) ingestion. Participants were blinded to treadmill VEL but the Omni RPE scale was in full view. Repeated-measures ANOVA showed a main effect (trial) for VEL (CAF ∼5 m·min−1 faster) for RPE 4 (p = 0.07) and RPE 7 (p = 0.03). Mean heart rate and oxygen consumption responses were consistently higher for CAF but failed to reach statistical significance. Individual responses to CAF were labeled positive using a criterion of 13.4 m·min−1 faster for CAF (vs. PLA). Ten of 32 trials (31%) were positive responses. In these, systematic increases were observed for heart rate (∼12 beats·min−1) and oxygen consumption (∼5.7 mL·kg−1·min−1). Blunted/stable respiratory exchange ratio values at higher VEL for positive responders suggest increased free fatty acid reliance during CAF. In conlusion, mean results show a mild effect of CAF during RPE production. However, individual responses more clearly indicate whether a true effect is possible. Trainers and individuals should consider individual responses to ensure effectively intensity regulation.

The influence of selected factors and sport results of endurance horses on their saliva cortisol concentration

2013 ◽  
Vol 16 (3) ◽  
pp. 533-541 ◽  
Author(s):  
I. Janczarek ◽  
A. Bereznowski ◽  
K. Strzelec
Keyword(s):  
Air Temperature ◽  
Cortisol Level ◽  
Repeated Measures ◽  
Hormone Level ◽  
Cortisol Concentration ◽  
The Body ◽  
Clear Correlation ◽  
Mean Values ◽  
Repeated Measures Design ◽  
The Mean

Abstract The aim of the study was to define the influence of the selected factors (gender, age, transportation time, riding distance and air temperature during the ride) on the cortisol secretion and finding a correlation between the hormone level and the horses’ sport results (veterinary parameters and the ride route parameters). The research was performed on 38 Arabian pure breed horses taking part in the endurance rides. The cortisol level was measured with enzyme-immunological method in saliva samples, taken four times from each horse. In order to verify the differences between the mean results the repeated measures design was applied. The significance of the differences between the mean values was determined by the Tukey test. To evaluate the interrelations between the analysed attributes Pearson’s correlation analysis was applied. The cortisol level at rest was not affected by any of the analysed factors. In case of other results, the most significant influence (P ≤ 0.05) was related to the gender, as well as the ride distance and air temperature during the ride. Higher cortisol level was noted in mares, horses running the longest distances and at the highest temperatures. A significant increase in the cortisol level was noted when the ride distance was longer. There were no clear correlation between the adrenal cortex activity and the veterinary parameters at different riding speed. High cortisol concentration can negatively affect the heart rate (HR) by increasing it, but it can simultaneously stimulate the body to fight dehydration.

scholarly journals Comparison between Different Prescription Methods for Aerobic Training in Young Adults

2019 ◽  
Vol 11 (22) ◽  
pp. 6420
Author(s):  
Fernando Policarpo ◽  
Pedro Valdivia-Moral ◽  
Maria do Socorro Luna-Cruz ◽  
Alex Véliz-Burgos ◽  
Juan Mansilla-Sepulveda ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Aerobic Training ◽  
Direct Method ◽  
Reference Value ◽  
Fat Percentage ◽  
Mean Values ◽  
The Mean

Anaerobic threshold and respiratory compensation are used to determine the intensity of aerobic exercise. This study aims to compare heart rate values relative to the percentages of 50%, 60%, 70%, and 80%, a comparison calculated through the reserve heart rate (HRR) and reserve oxygen consumption (VO2R) equations corresponding to the oxygen consumption obtained by the direct method. The sample was composed of 11 men and 10 women: mean age, 21.4 ± 2.8 years. Volunteers performed a maximal treadmill test in which oxygen uptake was measured using the VO2000® metabolic analyzer. The mean body fat percentage was 15.68 ± 8.02% corresponding to a lean body mass of 54.8 ± 13.0 kg and a maximal oxygen uptake (VO2max) of 56.0 ± 8.4 mL/Kg·min−1. The measured intensities (50%, 60%, 70% and 80% of VO2max) presented significant differences (p < 0.05) for each reference value. Mean values calculated by the HRR equation demonstrated a tendency to underestimate the intensities, while the values calculated by the VO2R equation showed a tendency to overestimate the intensities. As the main conclusion, it is pointed out that both methods were effective for determining the intensity of aerobic training. However, they presented significant differences, and the equations should be adjusted to increase precision. Thus, the use of HRR is recommended for the determination of training intensities.

scholarly journals The Effects of Emotional Schema Therapy and Differentiation Training on Emotional Divorce in Women

2121 ◽  
Vol 7 (1) ◽  
pp. 65-74
Author(s):  
Tahmineh Kamalian ◽  
◽  
Hassan Mirzahosseini ◽  
Nader Monirpoor ◽  
◽  
...  
Keyword(s):  
Mental Health ◽  
Psychological Distress ◽  
Cognitive Model ◽  
Control Group ◽  
Schema Therapy ◽  
Mean Values ◽  
Marital Intimacy ◽  
Significant Difference ◽  
The Mean ◽  
Study Participants

Background: Emotional Divorce (ED) is associated with decreased levels of Emotion Regulation (ER), adaptation, and mental health; subsequently, all such pressures raise stress in various dimensions among the affected individuals. Emotional Schema Therapy (EST), as a socio-cognitive model of ER, may improve marital intimacy and reduce couples’ psychological distress. The present study aimed to investigate the effects of EST and differentiation training on the odds of ED among women. Methods: The mean values of ED significantly decreased in both experimental groups, compared to the control group (P<0.05). A significant difference was also observed between the effects of the two interventions on decreasing the ED rate; thus, the effectiveness of EST was greater than that of differentiation training in this respect (P<0.05). Results: The mean values of ED significantly decreased in both experimental groups, compared to the control group (P<0.05). A significant difference was also observed between the effects of the two interventions on decreasing the ED rate; thus, the effectiveness of EST was greater than that of differentiation training in this respect (P<0.05). Conclusion: EST and differentiation training reduced ED among the study participants. These approaches can be adopted as an effective intervention to solve the couples’ problems and improve their marital relationship to reduce the odds of emotional divorce.

scholarly journals Energy System Contribution during 1500M Running in Untrained and Endurance-Trained Asian Male College Students

2021 ◽  
Vol 23 (2) ◽  
pp. 9-18
Author(s):  
Govindasamy Balasekaran ◽  
Loh Mun Keong ◽  
Viknesh Veeramuthu ◽  
Yong Tze Woon ◽  
Visvasuresh Victor Govindaswamy ◽  
...  
Keyword(s):  
Body Fat ◽  
Maximal Oxygen Consumption ◽  
Energy System ◽  
Oxygen Deficit ◽  
Accumulated Oxygen Deficit ◽  
Anaerobic Energy ◽  
The Mean ◽  
The Times ◽  
Study Participants ◽  
Aerobic And Anaerobic

OBJECTIVES To compare the aerobic and anaerobic energy system contribution during 1500m running between collegiate untrained (UT) and endurance trained (ET) subjects.METHODS Five Asian UT (age: 23.8 ± 0.4 yrs, body fat %: 15.9 ± 5.7 %, height: 174.0 ± 4.1 cm, weight: 65.5 ± 4.1 kg) and 5 Asian ET male participants (age: 24.4 ± 3.9 yrs, body fat %: 12.9 ± 6.9 %, height: 169.4 ± 5.1 cm, weight: 60.6 ± 8.1 kg) participated in this study. Participants attended 3 sessions to determine their body composition, submaximal and maximal oxygen consumption (VO<sub>2max</sub>) test, 1500m track running session (RS) and 1500m treadmill RS. The maximally accumulated oxygen deficit (MAOD) method was used to calculate energy system contribution.RESULTS The times for the 1500m track run for the UT and ET were 428.0 ± 48.7 and 331.6 ± 14.0 seconds (p=0.004) respectively. There were no significant differences in VO<sub>2</sub> between the 1500m track and treadmill RS indicating the participants ran to their personal best times for both trials. The mean VO<sub>2max</sub>(mL•kg<sup>-1</sup>•min<sup>-1</sup>) were significantly different between UT (45.1 ± 5.0) and ET participants (58.3 ± 2.2) (p=0.002). The mean relative contributions of the aerobic and anaerobic energy system during 1500m running were significantly different for the UT, 65.4 ± 7.0%, 34.6 ± 7.0 and ET, 75.7 ± 1.5%, 24.3 ± 1.5 % (p =0.011).CONCLUSIONS The point of equal contribution of the aerobic and the anaerobic systems occurred after thirty to forty seconds of intensive exhaustive running after which the aerobic contribution continues to increase while the anaerobic contribution decreases with increasing duration. By the end of 60th second of exhaustive running, the ET mean aerobic contribution is 71.5% compared to the UT’s 58.6%. This finding suggests a greater reliance on the aerobic energy system by the ET.

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