scholarly journals Effect Of Prior Heavy-intensity Exercise On The Vo2 On-And Off-kinetic Response To Moderate-intensity Exercise In Young Adults

2005 ◽  
Vol 37 (Supplement) ◽  
pp. S449
Author(s):  
Brendon J. Gurd ◽  
Donald H. Paterson ◽  
John M. Kowalchuk
Keyword(s):  
Young Adults ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise

Fat and carbohydrate metabolism during exercise in elderly and young subjects

1996 ◽  
Vol 271 (6) ◽  
pp. E983-E989 ◽  
Author(s):  
S. Sial ◽  
A. R. Coggan ◽  
R. Carroll ◽  
J. Goodwin ◽  
S. Klein
Keyword(s):  
Young Adults ◽  
Carbohydrate Metabolism ◽  
Relative Intensity ◽  
The Elderly ◽  
Absolute Intensity ◽  
Substrate Oxidation ◽  
Carbohydrate Oxidation ◽  
Moderate Intensity ◽  
Elderly Subjects ◽  
Moderate Intensity Exercise

We evaluated the effect of aging on fat and carbohydrate metabolism during moderate intensity exercise. Glycerol, free fatty acid (FFA), and glucose rate of appearance (Ra) in plasma and substrate oxidation were determined during 60 min of cycle ergometer exercise in six elderly (73 +/- 2 yr) and six young adults (26 +/- 2 yr) matched by gender and lean body mass. The elderly group was studied during exercise performed at 56 +/- 3% of maximum oxygen uptake, whereas the young adults were studied during exercise performed at the same absolute and at a similar relative intensity as the elderly subjects. Mean fat oxidation during exercise was 25-35% lower in the elderly subjects than in the young adults exercising at either the same absolute or similar relative intensities (P < 0.05). Mean carbohydrate oxidation in the elderly group was 35% higher than the young adults exercising at the same absolute intensity (P < 0.001) but 40% lower than the young adults exercising at the same relative intensity (P < 0.001). Average FFA Ra in the elderly subjects was 85% higher than in the young adults exercising at the same absolute intensity (P < 0.05) but 35% lower than the young adults exercising at a similar relative intensity (P < 0.05). We conclude that fat oxidation is decreased while carbohydrate oxidation is increased during moderate intensity exercise in elderly men and women. The shift in substrate oxidation was caused by age-related changes in skeletal muscle respiratory capacity because lipolytic rates and FFA availability were not rate limiting in the older subjects.

Prior heavy-intensity exercise speeds V̇o2 kinetics during moderate-intensity exercise in young adults

2005 ◽  
Vol 98 (4) ◽  
pp. 1371-1378 ◽  
Author(s):  
Brendon J. Gurd ◽  
Barry W. Scheuermann ◽  
Donald H. Paterson ◽  
John M. Kowalchuk
Keyword(s):  
Young Adults ◽  
Lactate Threshold ◽  
Near Infrared ◽  
Linear Regression Analysis ◽  
Cycle Ergometer ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Warm Up ◽  
Total Hemoglobin ◽  
Concentration Changes

The effect of prior heavy-intensity warm-up exercise on subsequent moderate-intensity phase 2 pulmonary O2 uptake kinetics (τV̇o2) was examined in young adults exhibiting relatively fast (FK; τV̇o2 < 30 s; n = 6) and slow (SK; τV̇o2 > 30 s; n = 6) V̇o2 kinetics in moderate-intensity exercise without prior warm up. Subjects performed four repetitions of a moderate (Mod1)-heavy-moderate (Mod2) protocol on a cycle ergometer with work rates corresponding to 80% estimated lactate threshold (moderate intensity) and 50% difference between lactate threshold and peak V̇o2 (heavy intensity); each transition lasted 6 min, and each was preceded by 6 min of cycling at 20 W. V̇o2 and heart rate (HR) were measured breath-by-breath and beat-by-beat, respectively; concentration changes of muscle deoxyhemoglobin (HHb), oxyhemoglobin, and total hemoglobin were measured by near-infrared spectroscopy (Hamamatsu NIRO 300). τV̇o2 was lower ( P < 0.05) in Mod2 than in Mod1 in both FK (20 ± 5 s vs. 26 ± 5 s, respectively) and SK (30 ± 8 s vs. 45 ± 11 s, respectively); linear regression analysis showed a greater “speeding” of V̇o2 kinetics in subjects exhibiting a greater Mod1 τV̇o2. HR, oxyhemoglobin, and total hemoglobin were elevated ( P < 0.05) in Mod2 compared with Mod1. The delay before the increase in HHb was reduced ( P < 0.05) in Mod2, whereas the HHb mean response time was reduced ( P < 0.05) in FK (Mod2, 22 ± 3 s; Mod1, 32 ± 11 s) but not different in SK (Mod2, 36 ± 13 s; Mod1, 34 ± 15 s). We conclude that improved muscle perfusion in Mod2 may have contributed to the faster adaptation of V̇o2, especially in SK; however, a possible role for metabolic inertia in some subjects cannot be overlooked.

O2 uptake kinetics, pyruvate dehydrogenase activity, and muscle deoxygenation in young and older adults during the transition to moderate-intensity exercise

2008 ◽  
Vol 294 (2) ◽  
pp. R577-R584 ◽  
Author(s):  
B. J. Gurd ◽  
S. J. Peters ◽  
G. J. F. Heigenhauser ◽  
P. J. LeBlanc ◽  
T. J. Doherty ◽  
...  
Keyword(s):  
Older Adults ◽  
Young Adults ◽  
Pyruvate Dehydrogenase ◽  
Lactate Threshold ◽  
Time Course ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Similar Time ◽  
O2 Uptake Kinetics ◽  
The Relationship

The adaptation of pulmonary O2 uptake (V̇o2p) kinetics is slowed in older compared with young adults during the transition to moderate-intensity exercise. In this study, we examined the relationship between V̇o2p kinetics and mitochondrial pyruvate dehydrogenase (PDH) activity in young ( n = 7) and older ( n = 6) adults. Subjects performed cycle exercise to a work rate corresponding to ∼90% of estimated lactate threshold. Phase 2 V̇o2p kinetics were slower ( P < 0.05) in older (τ = 40 ± 17 s) compared with young (τ = 21 ± 6 s) adults. Relative phosphocreatine (PCr) breakdown was greater ( P < 0.05) at 30 s in older compared with young adults. Absolute PCr breakdown at 6 min was greater ( P < 0.05) in older compared with young adults. In young adults, PDH activity increased ( P < 0.05) from baseline to 30 s, with no further change observed at 6 min. In older adults, PDH activity during baseline exercise was similar to that seen in young adults. During the exercise transition, PDH activity did not increase ( P > 0.05) at 30 s of exercise but was elevated ( P < 0.05) after 6 min. The change in deoxyhemoglobin (HHb) was greater for a given V̇o2p in older adults, and there was a similar time course of HHb accompanying the slower V̇o2p kinetics in the older adults, suggesting a slower adaptation of bulk O2 delivery in older adults. In conclusion, the slower adaptation of V̇o2p in older adults is likely a result of both an increased metabolic inertia and lower O2 availability.

Influence of phase I duration on phase II V̇o2 kinetics parameter estimates in older and young adults

2011 ◽  
Vol 301 (1) ◽  
pp. R218-R224 ◽  
Author(s):  
Juan M. Murias ◽  
Matthew D. Spencer ◽  
John M. Kowalchuk ◽  
Donald H. Paterson
Keyword(s):  
Young Adults ◽  
Phase I ◽  
Phase Ii ◽  
Moderate Intensity ◽  
Parameter Estimates ◽  
Moderate Intensity Exercise ◽  
Kinetics Parameters ◽  
Exercise Transitions ◽  
The Individual ◽  
Kinetics Parameter

Older adults (O) may have a longer phase I pulmonary O2 uptake kinetics (V̇o2p) than young adults (Y); this may affect parameter estimates of phase II V̇o2p. Therefore, we sought to: 1) experimentally estimate the duration of phase I V̇o2p (EE phase I) in O and Y subjects during moderate-intensity exercise transitions; 2) examine the effects of selected phase I durations (i.e., different start times for modeling phase II) on parameter estimates of the phase II V̇o2p response; and 3) thereby determine whether slower phase II kinetics in O subjects represent a physiological difference or a by-product of fitting strategy. V̇o2p was measured breath-by-breath in 19 O (68 ± 6 yr; mean ± SD) and 19 Y (24 ± 5 yr) using a volume turbine and mass spectrometer. Phase I V̇o2p was longer in O (31 ± 4 s) than Y (20 ± 7 s) ( P < 0.05). In O, phase II τV̇o2p was larger ( P < 0.05) when fitting started at 15 s (49 ± 12 s) compared with fits starting at the individual EE phase I (43 ± 12 s), 25 s (42 ± 10 s), 35 s (42 ± 12 s), and 45 s (45 ± 15 s). In Y, τV̇o2p was not affected by the time at which phase II V̇o2p fitting started (τV̇o2p = 31 ± 7 s, 29 ± 9 s, 30 ± 10 s, 32 ± 11 s, and 30 ± 8 s for fittings starting at 15 s, 25 s, 35 s, 45 s, and EE phase I, respectively). Fitting from EE phase I, 25 s, or 35 s resulted in the smallest CI τV̇o2p in both O and Y. Thus, fitting phase II V̇o2p from (but not constrained to) 25 s or 35 s provides consistent estimates of V̇o2p kinetics parameters in Y and O, despite the longer phase I V̇o2p in O.

scholarly journals Comparison of Physiological and Metabolic Responses to Playing Nintendo Wii Sports and Brisk Treadmill Walking

2009 ◽  
Vol 22 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Mark Willems ◽  
Timothy Bond
Keyword(s):  
Young Adults ◽  
Minute Ventilation ◽  
Health Benefits ◽  
Treadmill Walking ◽  
Metabolic Responses ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Nintendo Wii ◽  
Metabolic System ◽  
Game Activity

Comparison of Physiological and Metabolic Responses to Playing Nintendo Wii Sports and Brisk Treadmill WalkingRegular moderate-intensity exercise (e.g. brisk walking) provides health benefits. In the present study, we compared the physiological and metabolic responses of playing the Nintendo Wii Sports tennis, baseball and boxing with self-paced brisk treadmill walking. Ten young-adults (21±1 years; 73.9±12.0 kg; 1.76±0.06 m) played each sport for 10 min with a 5 min rest interval or, in a separate session, walked briskly (6.1±0.6 km·h-1) with an equivalent time order wearing the Cosmed K4b2metabolic system. In a bout of 10 min, the average values during Nintendo Wii boxing for physiological (i.e. minute ventilation, oxygen uptake and heart rate) and metabolic (i.e. energy expenditure, fat oxidation, carbohydrate oxidation and respiratory exchange ratio) responses were equal to brisk treadmill walking but lower for Nintendo Wii tennis and baseball (P<0.05). It was concluded that the physiological and metabolic responses of Nintendo Wii boxing would allow this game activity to be a viable part of a programme of structured exercise in young-adults to gain health benefits.

scholarly journals Barrier to health protocol adherence during exercise among youth in the COVID-19 pandemic era

2021 ◽  
Vol 4 (1) ◽  
pp. 8
Author(s):  
Supriyati Supriyati ◽  
Fitrawan Silvano ◽  
Resa Paksi Mandariska ◽  
Daniel Pandapotan Saragih ◽  
Claudia Gunawan ◽  
...  
Keyword(s):  
Health Promotion ◽  
Young Adults ◽  
Disease Risk ◽  
Communicable Disease ◽  
Moderate Intensity ◽  
Audience Response ◽  
Moderate Intensity Exercise ◽  
Online Questionnaire ◽  
Main Research ◽  
The Republic

Physical inactivity is one of the non-communicable disease risk factors. This study discusses how the Coronavirus Disease-2019 (COVID-19) has increased the leisure time, including among youth. The health promotion to improve the physical activities of youth is needed. This study aimed to analyze the level of compliance among Indonesian people particularly the young adults towards health protocol during exercise and conduct an intervention accordingly. This study used an action research design, with consecutive sampling. Respondents were Indonesian young adults who exercise outside of their homes during the COVID-19 pandemic. A total of 361 Indonesian young adults aged 18-25 years old, who exercise during the pandemic inside and/or outside the home, and willing to answer the questionnaire completed the online questionnaire. The questionnaire was developed from the six health protocols’ criteria from the Ministry of Health of the Republic of Indonesia. Data analysis used chi-squared tests. Furthermore, a short video was developed according to the main research findings and published on Instagram TV as a health intervention to the respondents. The results showed that the level of compliance among Indonesian young adults toward health protocol during exercise was low (24.1%). Moreover, only 35.3% of respondents applied physical distancing and 48.7% of respondents wore masks during at low-moderate intensity exercise. There was no significant association between gender, exercise intensity, and perception of the health protocol and the compliance of health protocol during exercise. In addition, the audience response toward the video campaign about health protocol during exercise was good with more than 1,000 views, 166 likes, and 50 comments. This study concluded that health promotion media that were developed based on the needs assessment results were effective to reach the target audiences.

106 - Vigorous Intensity Intervals and Moderate Intensity Exercise Have Similar Postexercise Impacts on Blood Glucose in Trained Young Adults With Type 1 Diabetes

2019 ◽  
Vol 43 (7) ◽  
pp. S38
Author(s):  
Andrea Macintosh ◽  
Jacqueline L. Hay ◽  
Dessi P. Zaharieva ◽  
Veronica Jamnik ◽  
Michael C. Riddell ◽  
...  
Keyword(s):  
Type 1 Diabetes ◽  
Young Adults ◽  
Blood Glucose ◽  
Moderate Intensity ◽  
Moderate Intensity Exercise ◽  
Vigorous Intensity
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