scholarly journals Walking Cadence during Moderate-Intensity Physical Activity in Pregnant Women

2021 ◽  
Vol 18 (12) ◽  
pp. 6593
Author(s):  
Mallory Marshall ◽  
Beth Birchfield ◽  
Rebecca Rogers ◽  
Joyeuse Senga ◽  
McKenna Persch ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Pregnant Women ◽  
Pearson Correlation ◽  
Current Data ◽  
Moderate Intensity ◽  
Metabolic Alterations ◽  
Moderate Intensity Physical Activity ◽  
Metabolic Equivalents ◽  
Significant Difference ◽  
Three Stages

Evidence has established that a cadence of 100 steps/min is indicative of the moderate intensity threshold of 3 metabolic equivalents (METs), but this has only been described in non-pregnant individuals. As metabolic alterations are well established during pregnancy, the purpose of this study was to determine if the walking cadence equivalent to 3 METs in pregnant women is similar to non-pregnant populations. Pregnant females (n = 29; age = 30.3 ± 3.2 years, gestational age = 23.9 ± 6.6 weeks) in their second or third trimester (>12 weeks gestation) completed three stages of treadmill walking for 5 min at different standardized walking speeds: 2.5, 3.0, and 3.5 miles per hour (mph). Oxygen consumption (VO2) and heart rate (HR) were measured each minute and METs were calculated for each stage. Real-time continuous monitoring of walking cadence was evaluated by an OptoGait gait analysis system. Following the three standardized speed stages, participants completed an additional stage walking at a speed that elicited 100 steps/min; VO2 and HR were also collected. A one-sample t-test was used to compare MET values at each stage to the heuristic 3 MET cutoff, and Pearson correlation coefficient was calculated to evaluate the relationship between cadence and METs. Mean cadence increased linearly across the three stages (2.5 mph = 103.7 ± 4.5, 3.0 mph = 112.5 ± 5.3, and 3.5 mph = 120.4 ± 6.2 steps/min), as did METs (2.5 mph = 2.7 ± 1.7, 3.0 mph = 3.2 ± 0.8, and 3.5 mph = 4.3 ± 1.8 METs) regardless of trimester. The average treadmill speed at which women walked at 100 steps/min was 2.4 ± 0.4 mph which elicited an oxygen consumption of 9.5 mL•kg−1•min−1, or 2.7 ± 0.7 METs. There was no significant difference between METs at 3.0 mph and the conventional 3 MET cut point for moderate-intensity PA (p < 0.05). There was a moderate and significant relationship between METs and cadence (2nd trimester: r = 0.51; 3rd trimester: r = 0.42). Current data indicate for the first time that the traditionally used 3 MET cutoff for moderate-intensity activity is appropriate for pregnant women despite metabolic alterations associated with pregnancy. This may have important implications for exercise prescription in pregnant populations.

scholarly journals Relationship Between Heart Rate, Oxygen Consumption, and Energy Expenditure in Futsal

2021 ◽  
Vol 12 ◽  
Author(s):  
Henrique Santos da Silva ◽  
Fabio Yuzo Nakamura ◽  
Marcelo Papoti ◽  
Alexsandro Santos da Silva ◽  
Julio Wilson Dos-Santos
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Energy Expenditure ◽  
Treadmill Running ◽  
Concordance Correlation ◽  
Altman Plot ◽  
Metabolic Equivalents ◽  
Significant Difference ◽  
Continuous Test ◽  
Good Individual

The primary aim of this study was to compare the measured oxygen consumption (Measured-VO2) in a simulated futsal game (S-Game) with the estimated oxygen consumption (Estimated-VO2) through a regression equation between heart rate (HR) and oxygen consumption (VO2) (HR-VO2) in treadmill running, and a secondary aim was to calculate the total energy expenditure (EE) in S-Game. Ten professional players (22.20 ± 3.22 years) were evaluated. HR-VO2 was determined individually in the continuous test on the treadmill (ContTest). The Measured-VO2 in S-Game was compared with the Estimated-VO2 in the ContTest. Alactic and lactic pathways were estimated by VO2. The Estimated-VO2 presented no statistically significant difference with the Measured-VO2, using the paired t-test (p = 0.38). However, the correlation between Estimated- and Measured-VO2 was very weak (r = −0.05), and it presented poor agreement (concordance correlation coefficient = −0.04). In addition, a Bland–Altman plot presented bias of −2.8 ml/kg/min and individual difference as large as 19 ml/kg/min. The HR-VO2 determined by the ContTest was not a good individual predictor of VO2. The high intensity and intermittent nature of the futsal game possibly caused dissociation in the HR-VO2 relationship. ContTest is not recommended for estimating VO2 and calculating individual EE in the futsal game. This is recommended only for the group mean. The total EE in S-Game was 13.10 ± 1.25 kcal.min−1 (10.81 ± 1.57 metabolic equivalents). The contributions from the metabolic pathways were as follows: aerobic (93%), alactic (5%), and lactic (2%).

scholarly journals Energy expenditure, recovery oxygen consumption, and substrate oxidation during and after body weight resistance exercise with slow movement compared to treadmill walking

2018 ◽  
Vol 105 (4) ◽  
pp. 371-385 ◽  
Author(s):  
T Nakagata ◽  
Y Yamada ◽  
H Naito
Keyword(s):  
Body Weight ◽  
Energy Expenditure ◽  
Resistance Exercise ◽  
Time Course ◽  
Treadmill Walking ◽  
Moderate Intensity ◽  
Slow Movement ◽  
Moderate Intensity Physical Activity ◽  
Metabolic Equivalents ◽  
Course Changes

The benefit of body weight resistance exercise with slow movement (BWRE-slow) for muscle function is well-documented, but not for energy metabolism. We aimed to examine physiological responses [e.g., energy expenditure (EE), respiratory exchange ratio (RER), and blood lactate (La)] during and after BWRE-slow compared to EE-matched treadmill walking (TW). Eight healthy young men (23.4 ± 1.8 years old, 171.2 ± 6.2 cm, 63.0 ± 4.8 kg) performed squat, push-up, lunge, heel-raise, hip-lift, and crunch exercises with BWRE-slow modality. Both the concentric and eccentric phases were set to 3 s. A total of three sets (10 repetitions) with 30 s rest between sets were performed for each exercise (26.5 min). On another day, subjects walked on a treadmill for 26.5 min during which EE during exercise was matched to that of BWRE-slow with the researcher controlling the treadmill speed manually. The time course changes of EE and RER were measured. The EE during exercise for BWRE-slow (92.6 ± 16.0 kcal for 26.5 min) was not significantly different from the EE during exercise for TW (95.5 ± 14.1 kcal, p = 0.36). BWRE-slow elicited greater recovery EE (40.55 ± 3.88 kcal for 30 min) than TW (37.61 ± 3.19 kcal, p = 0.029). RER was significantly higher in BWRE-slow during and 0–5 min after exercise, but became significantly lower during 25–30 min after exercise, suggesting greater lipid oxidation was induced about 30 min after exercise in BWRE-slow compared to TW. We also indicated that BWRE-slow has 3.1 metabolic equivalents in average, which is categorized as moderate-intensity physical activity.

Energy Expenditure in Vinyasa Yoga Versus Walking

2017 ◽  
Vol 14 (8) ◽  
pp. 597-605 ◽  
Author(s):  
Sally A. Sherman ◽  
Renee J. Rogers ◽  
Kelliann K. Davis ◽  
Ryan L. Minster ◽  
Seth A. Creasy ◽  
...  
Keyword(s):  
Public Health ◽  
Physical Activity ◽  
Energy Expenditure ◽  
Energy Cost ◽  
Vigorous Physical Activity ◽  
Treadmill Walking ◽  
Moderate Intensity ◽  
Moderate Intensity Physical Activity ◽  
Metabolic Equivalents ◽  
Intensity Physical Activity

Background:Whether the energy cost of vinyasa yoga meets the criteria for moderate-to-vigorous physical activity has not been established.Purpose:To compare energy expenditure during acute bouts of vinyasa yoga and 2 walking protocols.Methods:Participants (20 males, 18 females) performed 60-minute sessions of vinyasa yoga (YOGA), treadmill walking at a self-selected brisk pace (SELF), and treadmill walking at a pace that matched the heart rate of the YOGA session (HR-Match). Energy expenditure was assessed via indirect calorimetry.Results:Energy expenditure was significantly lower in YOGA compared with HR-Match (difference = 79.5 ± 44.3 kcal; P < .001) and SELF (difference = 51.7 ± 62.6 kcal; P < .001), but not in SELF compared with HR-Match (difference = 27.8 ± 72.6 kcal; P = .054). A similar pattern was observed for metabolic equivalents (HR-Match = 4.7 ± 0.8, SELF = 4.4 ± 0.7, YOGA = 3.6 ± 0.6; P < .001). Analyses using only the initial 45 minutes from each of the sessions, which excluded the restorative component of YOGA, showed energy expenditure was significantly lower in YOGA compared with HR-Match (difference = 68.0 ± 40.1 kcal; P < .001) but not compared with SELF (difference = 15.1 ± 48.7 kcal; P = .189).Conclusions:YOGA meets the criteria for moderate-intensity physical activity. Thus, YOGA may be a viable form of physical activity to achieve public health guidelines and to elicit health benefits.

A Steps/Minute Value for Moderate Intensity Physical Activity in Adolescent Females

2012 ◽  
Vol 24 (3) ◽  
pp. 399-408 ◽  
Author(s):  
Deirdre M. Harrington ◽  
Kieran P. Dowd ◽  
Catrine Tudor-Locke ◽  
Alan E. Donnelly
Keyword(s):  
Physical Activity ◽  
Mixed Model ◽  
Adolescent Females ◽  
Moderate Intensity ◽  
Moderate Intensity Physical Activity ◽  
Metabolic Equivalents ◽  
Intensity Physical Activity ◽  
Analytical Approaches ◽  
The Relationship ◽  
Over Ground Walking

The number of steps/minute (i.e., cadence) that equates to moderate intensity in adolescents is not known. To that end, 31 adolescent females walked on a treadmill at 5 different speeds while wearing an ActivPAL accelerometer and oxygen uptake was recorded by indirect calorimetry. The relationship between metabolic equivalents (METs) and cadence was explored using 3 different analytical approaches. Cadence was a significant predictor of METs (r=.70; p<.001). Moderate intensity (3 METs) corresponded to 94 or 114 steps/minute based on the mixed model and ROC analysis, respectively. These two values, and a practical value of 100 steps/minute, were cross-validated on an independent sample of 33 adolescent females during over-ground walking at 3 speeds. The sensitivity and specificity of each value correctly identifying 3 METs were 98.5% and 87.2% for 94 steps/minute, 72.9% and 98.8 for 114 steps/minute and 96.5% and 95.7% for 100 steps/minute. Compromising on a single cadence of 100 steps/minute would be a practical value that approximates moderate intensity in adolescent females and can be used for physical activity interpretation and promotion.

scholarly journals Research on the Influence of Prenatal Exercise on the Type of Delivery

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Vlatka Bojanić ◽  
Vesna Ljubojević
Keyword(s):  
Pregnant Women ◽  
Preterm Delivery ◽  
Positive Impact ◽  
Moderate Intensity ◽  
Control Group ◽  
Theoretical Part ◽  
Vaginal Deliveries ◽  
Significant Difference ◽  
Type Of Delivery ◽  
Prenatal Exercise

INTRODUCTION / OBJECTIVE Pregnant women were not recommended to exercise because there was a risk of preterm delivery. Prenatal exercise however may reduce the risk of preterm delivery by other mechanisms such as reduced oxidative stress or improved placental vascularization. Given that the number of cesarean deliveries is growing and that a moderate-intensity physical activity can have a beneficial effect on mother and fetus, it is necessary to determine the frequency of delivery with pregnant women who performed prenatal exercises and those who did not exercise. METERIALS AND METHODS: One hundred and twenty pregnant women participated in the study (n = 120). Pregnant women who attended only the theoretical part were included in the control group (n = 59). By joining the experimental group, pregnant women (n = 61) participated in both the theoretical part and prenatal exercises. We followed each participant for 8 weeks, which is the duration of one cycle of psychophysical preparation. RESULT: In the group where pregnant women practiced prenatal exercises, vaginal deliveries predominate, almost twice as many as cesarean births. On the other hand, in the group where pregnant women did not exercise there is a slight decrease in the frequency of vaginal deliveries, with a tendency to equalize the results because there is an evident increase in the cesarean sections in that group. The application of the chi-square test did not determine the presence of a statistically significant difference in terms of delivery between the group of pregnant women who practiced prenatal exercises and those who did not. CONCLUSION: Prenatal exercise of moderate intensity has a positive impact on the type of delivery. Although no statistically significant difference was observed between pregnant women who exercised and those who did not, there is a tendency for an increase in vaginal delivery in pregnant women who performed prenatal exercise.

Abstract P123: The Physical Activity Built Environment: Evaluation of the Concordance of Perceived versus Measured Access to Parks and Bike Paths

Circulation ◽  
2016 ◽  
Vol 133 (suppl_1) ◽  
Author(s):  
Claire E Bollinger ◽  
Darryl B Hood ◽  
Julie K Bower
Keyword(s):  
Physical Activity ◽  
Built Environment ◽  
Pregnant Women ◽  
White Women ◽  
Self Report ◽  
Moderate Intensity ◽  
Moderate Intensity Physical Activity ◽  
Intensity Physical Activity ◽  
Objectively Measured ◽  
Perceived Access

Background: Approximately 80% of pregnant women in the US do not meet the CDC recommendation for moderate-intensity physical activity. The built environment is a key contributor to physical activity (PA) behavior. However, there may be a disconnect between physical attributes of the built environment and perceived access to an environment that supports PA. Use of a geographic information system (GIS) to objectively measure aspects of the built environment can yield important information about proximity of resources for supporting PA. We evaluated concordance of perceived access to multi-use bike paths (MUBP) and parks in a population of pregnant women. We also examined demographic characteristics associated with concordance between perceived and actual supports for PA. Methods: A population of 155 pregnant women in the greater Columbus, OH area reported perceptions of access to environmental supports within their neighborhood (defined as 0.5 mi. radius/ 10 min. walk) and community (10 mi. radius/ 20 min. drive), along with self-reported PA information. Addresses were abstracted from medical records and geocoded. Within ArcMap 10.2.2 (ESRI, Redlands, CA), buffers at distances of 0.5, 1, and 10 miles were created around MUBP and parks, respectively. Respondents were classified as “near” a resource if their address fell within those buffers. Logistic regression was used to examine the association between concordance of self-report with objectively measured proximity and demographic factors associated with higher concordance. Results: Within the study population of 155, 12% and 28% of women lived within 0.5 and 1 mile of a dedicated MUBP, respectively. More women lived within close proximity to a park (46% within a 0.5 mile radius, and 69% were within a 1 mile radius). The discordancy for parks ranged from 9.68%-49.03%, and from 16.77%-76.13% for MUBP. Concordance of report of parks within the community was higher among non-Hispanic white women (OR=4.2 [1.1, 15.3]) and that concordance or over-reporting of access to parks within the community was higher among married women (OR=5.3 [1.3, 21.5]). There were no significant differences in self-reported PA or changes in PA, however women living within 1 mile of a park reported more minutes of moderate-to-vigorous PA. A greater percentage of those with access reported increasing or maintaining levels of moderate PA from before pregnancy through the third trimester. Conclusions: The discordance between perception of access and objectively measured proximity to MUBP and parks suggests a substantial portion of women are not aware of their availability, or do not perceive them as relevant factors in influencing their PA behaviors during pregnancy. It may be that physical proximity is not a major driver in perceived access. Characteristics of the built environment, such as safety or social environment, may play a larger role in influencing PA behaviors.

scholarly journals Investigation of the Relationship Between Peak Vertical Accelerations and Aerobic Exercise Intensity During Graded Walking and Running in Postmenopausal Women

2020 ◽  
pp. 1-9
Author(s):  
Erreka Gil-Rey ◽  
Kevin C. Deere ◽  
Sara Maldonado-Martín ◽  
Natalia Palacios-Samper ◽  
Agueda Azpeitia ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Aerobic Exercise ◽  
Exercise Intensity ◽  
Weight Bearing ◽  
Osteogenic Potential ◽  
Moderate Intensity ◽  
Metabolic Equivalents ◽  
Vertical Accelerations ◽  
Multilevel Linear Regression ◽  
The Relationship

How exercise intensity targets, calibrated according to oxygen consumption, relate to vertical impacts during weight-bearing exercise is currently unknown. The authors investigated the relationship between vertical peaks (VPs) and metabolic equivalents (METs) of oxygen consumption in 82 women during walking and running. The magnitude of VPs, measured using a hip-worn triaxial accelerometer, was derived from recommended aerobic exercise intensity targets. VPs were 0.63 ± 0.18g at the lower recommended absolute exercise intensity target (3 METs) but >1.5g at the upper end of moderate-intensity activities (1.90 ± 1.13g at 6 METs). Multilevel linear regression analyses identified speed and type of locomotion as the strongest independent predictors of VPs, explaining 54% and 11% of variance, respectively. The authors conclude that, in contrast to lower intensities, exercising close to or above the 6-MET threshold generates VPs of osteogenic potential, suggesting this could provide simultaneous benefits to decrease all-cause mortality and osteoporosis risk.

scholarly journals The performance and aerobic endurance effects of high-intensity versus moderate-intensity continuous running

2019 ◽  
Vol 44 (9) ◽  
pp. 990-996
Author(s):  
Even Jarstad ◽  
Asgeir Mamen
Keyword(s):  
Oxygen Consumption ◽  
High Intensity ◽  
Test Procedure ◽  
Maximal Oxygen Consumption ◽  
Fat Oxidation ◽  
Moderate Intensity ◽  
Time To Exhaustion ◽  
Maximal Heart Rate ◽  
Significant Difference ◽  
Continuous Running

The aim of the present study was to investigate the performance and aerobic endurance effects of high-intensity (HICR) versus moderate-intensity continuous running (MICR), which were nonmatched for total work. Twenty healthy recreational athletes (aged 28 ± 5 years) were randomly assigned to an HICR, MICR, or no-intervention control (C) group. The HICR group (n = 7) performed a 20-min strenuous, almost exhausting, run above lactate threshold (LT) at ∼88% of maximal heart rate (HRmax), whereas the MICR group (n = 7) performed a 40-min run at ∼80% HRmax. Both the HICR and MICR groups performed 3 intervention sessions a week, in addition to ∼60% of their regular aerobic exercise, for 10 weeks. The C group (n = 6) performed regular physical exercise throughout the study. Time to exhaustion, during a ∼4–8-min ramp test procedure, was significantly increased by 23% and 24% (P < 0.01) following HICR or MICR, respectively, with no significant difference in the change in time to exhaustion (P = 1.00) at pre- to post-training between the 2 training modalities (HICR and MICR). In the HICR group, maximal oxygen consumption and velocity at LT increased significantly by 5.0% and 6.8% (P < 0.01), respectively. The MICR group increased relative maximal oxygen consumption (mL·kg−1·min−1) significantly by 4.7% (P < 0.05), whereas the pulmonary respiratory gas-exchange ratio was significantly decreased at a submaximal workload by 4.2% (P < 0.01), indicating enhanced fat oxidation. No performance or physiological effects were observed in the C group. The present study indicates that even with a substantially lower total energy turnover, HICR can be as performance enhancing as MICR. Moreover, HICR can increase maximal aerobic power, whereas MICR may enhance fat oxidation.

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