GENDER DIFFERENCES IN MAXIMAL OXYGEN CONSUMPTION (VO2max) DURING GRADED EXERCISE TESTING IN CHRONIC HEART FAILURE (CHF).

1995 ◽  
Vol 27 (Supplement) ◽  
pp. S159
Author(s):  
H. Daida ◽  
T. G. Allison ◽  
B. D. Johnson ◽  
R. W. Squires ◽  
L. J. Olson
2018 ◽  
Vol 43 (6) ◽  
pp. 609-616 ◽  
Author(s):  
Nicholas M. Beltz ◽  
Fabiano T. Amorim ◽  
Ann L. Gibson ◽  
Jeffrey M. Janot ◽  
Len Kravitz ◽  
...  

Recent examinations have shown lower maximal oxygen consumption during traditional ramp (RAMP) compared with self-paced (SPV) graded exercise testing (GXT) attributed to differences in cardiac output. The current study examined the differences in hemodynamic and metabolic responses between RAMP and SPV during treadmill exercise. Sixteen recreationally trained men (aged23.7 ± 3.0 years) completed 2 separate treadmill GXT protocols. SPV consisted of five 2-min stages (10 min total) of increasing speed clamped by the Borg RPE6-20 scale. RAMP increased speed by 0.16 km/h every 15 s until volitional exhaustion. All testing was performed at 3% incline. Oxygen consumption was measured via indirect calorimetry; hemodynamic function was measured via thoracic impedance and blood lactate (BLa−) was measured via portable lactate analyzer. Differences between SPV and RAMP protocols were analyzed as group means by using paired-samples t tests (R Core Team 2017). Maximal values for SPV and RAMP were similar (p > 0.05) for oxygen uptake (47.1 ± 3.4 vs. 47.4 ± 3.4 mL·kg−1·min−1), heart rate (198 ± 5 vs. 200 ± 6 beats·min−1), ventilation (158.8 ± 20.7 vs. 159.3 ± 19.0 L·min−1), cardiac output (26.9 ± 5.5 vs. 27.9 ± 4.2 L·min−1), stroke volume (SV) (145.9 ± 29.2 vs. 149.8 ± 25.3 mL·beat−1), arteriovenous oxygen difference (18.5 ± 3.1 vs. 19.7 ± 3.1 mL·dL−1), ventilatory threshold (VT) (78.2 ± 7.2 vs. 79.0% ± 7.6%), and peak BLa− (11.7 ± 2.3 vs. 11.5 ± 2.4 mmol·L−1), respectively. In conclusion, SPV elicits similar maximal hemodynamic responses in comparison to RAMP; however, SV kinetics exhibited unique characteristics based on protocol. These results support SPV as a feasible GXT protocol to identify useful fitness parameters (maximal oxygen uptake, oxygen uptake kinetics, and VT).


Circulation ◽  
1995 ◽  
Vol 91 (12) ◽  
pp. 2924-2932 ◽  
Author(s):  
Alain Cohen-Solal ◽  
Thierry Laperche ◽  
Daniel Morvan ◽  
Michel Geneves ◽  
Bernard Caviezel ◽  
...  

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Nicholas M. Beltz ◽  
Ann L. Gibson ◽  
Jeffrey M. Janot ◽  
Len Kravitz ◽  
Christine M. Mermier ◽  
...  

Graded exercise testing (GXT) is the most widely used assessment to examine the dynamic relationship between exercise and integrated physiological systems. The information from GXT can be applied across the spectrum of sport performance, occupational safety screening, research, and clinical diagnostics. The suitability of GXT to determine a valid maximal oxygen consumption (VO2max) has been under investigation for decades. Although a set of recommended criteria exists to verify attainment of VO2max, the methods that originally established these criteria have been scrutinized. Many studies do not apply identical criteria or fail to consider individual variability in physiological responses. As an alternative to using traditional criteria, recent research efforts have been directed toward using a supramaximal verification protocol performed after a GXT to confirm attainment of VO2max. Furthermore, the emergence of self-paced protocols has provided a simple, yet reliable approach to designing and administering GXT. In order to develop a standardized GXT protocol, additional research should further examine the utility of self-paced protocols used in conjunction with verification protocols to elicit and confirm attainment of VO2max.


2019 ◽  
Vol 6 (1) ◽  
pp. 48-53
Author(s):  
Fauzan Muttaqien ◽  
Yulvina Yulvina ◽  
Riana Novita Sari ◽  
Fahmi Syarif ◽  
Sri Wahyudati ◽  
...  

Background: Physical exercise in patients with heart failure maydecrease the level of proinflammatory biomarkers,increase maximal oxygen consumption, improve pulmonary function and quality of life. Circuit training is one of the most advantageous exercise models because it improves cardiorespiratory fitness and muscle strength. Objective: This study was aimed to investigate the effect of circuit training on proinflammatory biomarkers, functional capacity, pulmonary function, and quality of life in patients with chronic heart failure in RSUP Dr. Kariadi Methods: Twenty-six stable chronic heart failure with reduced ejection fraction patients were randomized into exercise group that received circuit training in the rehabilitation center of Kariadi Hospital for a month and control group. TNF- ? levels, maximum oxygen consumption, pulmonary function, and quality of life were taken before and after the exercise period. Data between two groups was analyzed with the Mann-Whitney test. Pre and post data was analyzed with the Wilcoxon test.  Results: Nine-teensubjects completed the study without any significant side effects.There was no significant difference in TNF-? levels before and after treatment between treatment groups and control groups (p=0,513). The treatment group with circuit training showed a greater increase in maximum oxygen consumption (p=0,034), greater increase in Forced Vital Capacity value(p=0,010) and a greater increase in quality of life score(p=0,047)than the control group. Conclusion: Circuit training in patients with chronic heart failure can increase maximal oxygen consumption, lung function, and quality of life, but no changes in inflammatory biomarkers. Keywords: Circuit training, TNF-a, maximal oxygen consumption, FVC, quality of life   Latar belakang: Latihan fisik pada pasien gagal jantung dapat menurunkan kadar biomarker proinflamasi, meningkatkan konsumsi oksigen maksimal, memperbaiki fungsi paru dan meningkatkan kualitas hidup. Latihan sirkuit merupakan salah satu model latihan fisik yang lebih menguntungkan karena mampu memperbaiki kebugaran kardiorespirasi dan kekuatan otot sekaligus. Tujuan:Menganalisispengaruh latihan sirkuit terhadap biomarker inflamasi, kapasitas fungsional, fungsi parudan kualitas hiduppasien gagal jantung kronik di RSUP Dr.Kariadi. Metode:Dua puluh enam pasien gagal jantung kronik stabil dengan penurunan fraksi ejeksi ventrikel kiri dirandomisasi menjadi kelompok yang  mendapatkan latihan sirkuit di bagian rehabilitasi RSUP Kariadi selama 1 bulan dan kelompok kontrol. Kadar TNF-a, nilai konsumsi oksigen maksimal, fungsi paru, dan kualitas hidupdiambil sebelum dan sesudah periode latihan. Analisis data antara dua kelompok menggunakan uji Mann-Whitney.Analisis data pre dan post, menggunakan uji Wilcoxon Hasil: Sembilan belas subjek menyelesaikan studi tanpa ada efek samping.Tidak didapati perubahan kadar TNF-a sesudah latihan sirkuit (p=0,513);Kelompok perlakuan dengan latihan sirkuit menunjukkan peningkatan konsumsi oksigen maksimal yang lebih besar (p=0,034), rerata peningkatan nilai FVC (Forced Vital Capacity) setelah latihan yang lebih besar (p=0,010), sertarerata peningkatan kualitas hidup yang lebih besar (p=0,047) dibandingkan kelompok kontrol. Simpulan: Latihan sirkuit pada pasien gagal jantung kronik dapat meningkatkan konsumsi oksigen maksimal, fungsi paru, dan kualitas hidup, namun tidak menyebabkan perubahan padabiomarker inflamasi. Kata Kunci: Latihan sirkuit, TNF-a, konsumsi oksigen maksimal, FVC, kualitas hidup


2007 ◽  
Vol 57 (2) ◽  
pp. 95-99 ◽  
Author(s):  
James A. Davis ◽  
Ralph Rozenek ◽  
Derek M. DeCicco ◽  
Michael T. Carizzi ◽  
Patrick H. Pham

BMJ Open ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. e021966 ◽  
Author(s):  
Federica Dellafiore ◽  
Cristina Arrigoni ◽  
Francesco Pittella ◽  
Gianluca Conte ◽  
Arianna Magon ◽  
...  

AimThe aim of this study was to critically analyse and describe gender differences related to self-care among patients with chronic heart failure (HF).Methods and resultsA monocentric real-world cohort of 346 patients with chronic HF in follow-up was used for this cross-sectional study. We report data related to the cohort’s demographic and clinical characteristics. Self-care was assessed using the Self-Care of Heart Failure Index before patients’ discharge. After bivariate analysis, logistical regression models were used to describe the relationship between gender, self-care behaviours and self-care confidence. While men were found to have more than quadruple the risk of poor self-care than women (OR 4.596; 95% CI 1.075 to 19.650), men were also found to be approximately 60% more likely to have adequate self-care confidence than women (OR 0.412; 95% CI 0.104 to 0.962). Considering that self-care confidence is described as a positive predictor of behaviours, our results suggest a paradox. It is possible that the patient–caregiver relationship mediates the effect of confidence on behaviours. Overall, adequate levels of self-care behaviours are a current issue, ranging 7.6%–18.0%.ConclusionThis study sets the stage for future research where elements of the patient–caregiver relationship ought to be considered to inform the planning of appropriate educational interventions. We recommend routinely measuring patients’ self-care behaviours to guide their follow-up and as a basis for any changes in their daily life behaviours.


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