Resting Mechanomyography After Aerobic Exercise

2004 ◽  
Vol 29 (6) ◽  
pp. 743-757 ◽  
Author(s):  
William P.S. McKay ◽  
Philip D. Chilibeck ◽  
Karen E. Chad ◽  
Brian L.F. Daku
Keyword(s):  
Oxygen Consumption ◽  
Low Frequency ◽  
Young Male ◽  
Cycle Ergometer ◽  
Mechanical Activity ◽  
Biochemical Processes ◽  
Acoustic Myography ◽  
Resting Muscle ◽  
Excess Postexercise Oxygen Consumption ◽  
Muscle Sounds

A number of mechanisms have been proposed for the elevation in oxygen consumption following exercise. Biochemical processes that return muscle to its preexercise state do not account for all the oxygen consumed after exercise. It is possible that mechanical activity in resting muscle, which produces low frequency vibrations (i.e., muscle sounds: mechano-myographic [MMG] activity), could contribute to the excess postexercise oxygen consumption. Therefore the purpose of this study was to determine whether the resting MMG amplitude changes after exercise, and whether the change is related to the elevation in oxygen consumption [Formula: see text] Ten young male subjects (22.9 yrs) performed 30 minutes of exercise on a cycle ergometer at an intensity corresponding to 70%peak [Formula: see text] Oxygen consumption was measured by indirect calorimetry, and MMG by an accelerometer placed over the mid-quadriceps before exercise and for 5.5 hours after exercise. MMG activity, expressed as mean absolute acceleration, was significantly elevated for the 5.5 hours of measurement after exercise (p <  0.05). MMG and [Formula: see text] decayed exponentially after exercise with time constants of 7.2 minutes and 7.4 minutes, respectively. We conclude that muscle is mechanically active following exercise and that this may contribute to an elevated [Formula: see text] Key words: excess postexercise oxygen consumption, muscle sounds, acoustic myography

Resting muscle sounds in anesthetized patients

1998 ◽  
Vol 76 (4) ◽  
pp. 401-406 ◽  
Author(s):  
William P McKay ◽  
Peter H Gregson ◽  
Benjamin WS McKay ◽  
Travis Blanchet
Keyword(s):  
Informed Consent ◽  
Elective Surgery ◽  
Low Frequency ◽  
Muscle Relaxants ◽  
Signal Power ◽  
Contracting Muscle ◽  
Volar Forearm ◽  
Resting Muscle ◽  
Muscle Sounds ◽  
Made In

It is known that contracting muscle makes low frequency sound vibrations.Small vibrations of uncertain origin are found over resting muscle. These could be shown to beof muscle origin if they significantly diminish in response to agents expected to decrease muscleactivity. Thiopental, propofol, and neuromuscular-junction blocking muscle relaxants have suchproperties. Twenty-one subjects slated for elective surgery for which they would routinely beanesthetized and paralysed gave informed consent to having a small accelerometer taped upontheir supine biceps (9 subjects), or volar forearm (12 subjects). Recordings were made in fourstages while subjects: (i) lifted a 2-kg weight just off the sponge armrest on whichtheir outstretched arm lay; (ii) relaxed their arm in the awake state prior toanesthesia; (iii) had anesthesia induced with intravenous thiopental (n = 11)or propofol (n = 10); and (iv) were paralysed. Recordings were digitised at172-Hz and 6-s segments fast Fourier transformed (FFT). Total signal power, as determined bythe area under the power spectrum, was significantly different (p < 0.05) in all stages forthe biceps and in all but stages (iii) from (iv) in the forearm. It appearsthat resting muscle generates measurable vibrations.Key words: muscle sounds, accelerometer, anesthesia.

Effects of Split Exercise Sessions on Excess Postexercise Oxygen Consumption and Resting Metabolic Rate

1998 ◽  
Vol 23 (5) ◽  
pp. 433-443 ◽  
Author(s):  
Khalid S. Almuzaini ◽  
Jeffrey A. Potteiger ◽  
Samuel B. Green
Keyword(s):  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Key Words ◽  
Resting Metabolic Rate ◽  
Exercise Bout ◽  
Exercise Duration ◽  
Cycle Ergometer ◽  
Exercise Session ◽  
Male Volunteers ◽  
Excess Postexercise Oxygen Consumption

This study involved examining how splitting a 30-min exercise bout on a cycle ergometer into two equal sessions affects excess postexercise oxygen consumption (EPOC) and resting metabolic rate (RMR). In this study, 10 male volunteers (age = 23 ± 3.8) participated in two exercise trials, which were randomly assigned in a counterbalanced design and separated by 40 hr. One trial was 30 min of exercise at 70% [Formula: see text](CONT), followed by a 40-min measurement of EPOC. The second trial was divided into two 15-min sessions (SPLIT), separated by 6 hr. A 20 min measurement of EPOC followed each SPLIT session. Results indicated that the combined magnitude of EPOCs from SPLIT (7,410 ± 1,851 ml) was significantly greater than that from CONT (5,278 ± 1,305 ml). Data indicate that dividing a 30-min exercise session into two parts for these individuals significantly increases magnitude of EPOC but does not affect RMR. Key words: EPOC, RMR,[Formula: see text], exercise duration

Excess postexercise oxygen consumption and recovery rate in trained and untrained subjects

1997 ◽  
Vol 83 (1) ◽  
pp. 153-159 ◽  
Author(s):  
Kevin R. Short ◽  
Darlene A. Sedlock
Keyword(s):  
Oxygen Consumption ◽  
Recovery Rate ◽  
Recovery Period ◽  
Rest Period ◽  
Recovery Phase ◽  
Cycle Ergometer ◽  
Peak Oxygen Consumption ◽  
Fitness Level ◽  
Relative Decline ◽  
Excess Postexercise Oxygen Consumption

Short, Kevin R., and Darlene A. Sedlock. Excess postexercise oxygen consumption and recovery rate in trained and untrained subjects. J. Appl. Physiol.83(1): 153–159, 1997.—The purpose of this study was to determine whether aerobic fitness level would influence measurements of excess postexercise oxygen consumption (EPOC) and initial rate of recovery. Twelve trained [Tr; peak oxygen consumption (V˙o 2 peak) = 53.3 ± 6.4 ml ⋅ kg−1 ⋅ min−1] and ten untrained (UT;V˙o 2 peak = 37.4 ± 3.2 ml ⋅ kg−1 ⋅ min−1) subjects completed two 30-min cycle ergometer tests on separate days in the morning, after a 12-h fast and an abstinence from vigorous activity of 24 h. Baseline metabolic rate was established during the last 10 min of a 30-min seated preexercise rest period. Exercise workloads were manipulated so that they elicited the same relative, 70%V˙o 2 peak (W70%), or the same absolute, 1.5 l/min oxygen uptake (V˙o 2) (W1.5), intensity for all subjects, respectively. RecoveryV˙o 2, heart rate (HR), and respiratory exchange ratio (RER) were monitored in a seated position until baseline V˙o 2 was reestablished. Under both exercise conditions, Tr had shorter EPOC duration (W70% = 40 ± 15 min, W1.5 = 21 ± 9 min) than UT (W70% = 50 ± 14 min; W1.5 = 39 ± 14 min), but EPOC magnitude (Tr: W70% = 3.2 ± 1.0 liters O2, W1.5 = 1.5 ± 0.6 liters O2; UT: W70% = 3.5 ± 0.9 liters O2, W1.5 = 2.4 ± 0.6 liters O2) was not different between groups. The similarity of Tr and UT EPOC accumulation in the W70% trial is attributed to the parallel decline in absolute V˙o 2 during most of the initial recovery period. Tr subjects had faster relative decline during the fast-recovery phase, however, when a correction for their higher exerciseV˙o 2 was taken. Postexercise V˙o 2 was lower for Tr group for nearly all of the W1.5 trial and particularly during the fast phase. Recovery HR kinetics were remarkably similar for both groups in W70%, but recovery was faster for Tr during W1.5. RER values were at or below baseline throughout much of the recovery period in both groups, with UT experiencing larger changes than Tr in both trials. These findings indicate that Tr individuals have faster regulation of postexercise metabolism when exercising at either the same relative or same absolute work rate.

scholarly journals Recovery heat in muscular contraction without lactic acid formation

1931 ◽  
Vol 108 (757) ◽  
pp. 279-301 ◽  
Keyword(s):  
Acetic Acid ◽  
Oxygen Consumption ◽  
Lactic Acid ◽  
Muscular Contraction ◽  
Acid Formation ◽  
Anaerobic Conditions ◽  
Spontaneous Breakdown ◽  
Rate Of Oxygen Consumption ◽  
Resting Muscle

In a comparison of muscles poisoned with mono-iodo-acetic acid (IAA) in the presence and in the absence of oxygen respectively, Lundsgaard (1930) found:- (1) That the spontaneous breakdown of phosphagen in poisoned resting muscle is much more rapid under anaerobic conditions. (2) That the onset of the characteristic contracture produced by IAA is accompanied always by an increase in the rate of oxygen consumption.

Ten-day endurance training attenuates the hyperosmotic suppression of cutaneous vasodilation during exercise but not sweating

2005 ◽  
Vol 99 (1) ◽  
pp. 237-243 ◽  
Author(s):  
Takashi Ichinose ◽  
Kazunobu Okazaki ◽  
Shizue Masuki ◽  
Hiroyuki Mitono ◽  
Mian Chen ◽  
...  
Keyword(s):  
Endurance Training ◽  
Exercise Intensity ◽  
Plasma Osmolality ◽  
Young Male ◽  
Cycle Ergometer ◽  
Peak Oxygen Consumption ◽  
Cutaneous Vasodilation ◽  
Thermoregulatory Responses ◽  
Before And After ◽  
The Individual

It is well known that hyperosmolality suppresses thermoregulatory responses and that plasma osmolality (Posmol) increases with exercise intensity. We examined whether the decreased esophageal temperature thresholds for cutaneous vasodilation (THFVC) and sweating (THSR) after 10-day endurance training (ET) are caused by either attenuated increase in Posmol at a given exercise intensity or blunted sensitivity of hyperosmotic suppression. Nine young male volunteers exercised on a cycle ergometer at 60% peak oxygen consumption rate (V̇o2 peak) for 1 h/day for 10 days at 30°C. Before and after ET, thermoregulatory responses were measured during 20-min exercise at pretraining 70% V̇o2 peak in the same environment as during ET under isoosmotic or hyperosmotic conditions. Hyperosmolality by ∼10 mosmol/kgH2O was attained by acute hypertonic saline infusion. After ET, V̇o2 peak and blood volume (BV) both increased by ∼4% ( P < 0.05), followed by a decrease in THFVC ( P < 0.05) but not by that in THSR. Although there was no significant decrease in Posmol at the thresholds after ET, the sensitivity of increase in THFVC at a given increase in Posmol [ΔTHFVC/ΔPosmol,°C·(mosmol/kgH2O)−1], determined by hypertonic infusion, was reduced to 0.021 ± 0.005 from 0.039 ± 0.004 before ET ( P < 0.05). The individual reductions in ΔTHFVC/ΔPosmol after ET were highly correlated with their increases in BV around THFVC ( r = −0.89, P < 0.005). In contrast, there was no alteration in the sensitivity of the hyperosmotic suppression of sweating after ET. Thus the downward shift of THFVC after ET was partially explained by the blunted sensitivity to hyperosmolality, which occurred in proportion to the increase in BV.

3-min all-out effort on cycle ergometer is valid to estimate the anaerobic capacity by measurement of blood lactate and excess post-exercise oxygen consumption

2018 ◽  
Vol 19 (5) ◽  
pp. 645-652 ◽  
Author(s):  
Alessandro Moura Zagatto ◽  
Paulo Eduardo Redkva ◽  
Rodrigo Araújo Bonetti de Poli ◽  
Joel Abraham Martinez González ◽  
Jeniffer Zanetti Brandani ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Blood Lactate ◽  
Anaerobic Capacity ◽  
Cycle Ergometer ◽  
Post Exercise

Reversal of muscle fatigue during 16 h of heavy intermittent cycle exercise

2004 ◽  
Vol 97 (6) ◽  
pp. 2166-2175 ◽  
Author(s):  
H. J. Green ◽  
T. A. Duhamel ◽  
S. Ferth ◽  
G. P. Holloway ◽  
M. M. Thomas ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Muscle Fatigue ◽  
Intermittent Exercise ◽  
Low Frequency ◽  
Quadriceps Muscle ◽  
Stimulation Frequency ◽  
Peak Oxygen Consumption ◽  
Force Frequency ◽  
Reduction In Force ◽  
Before And After

This study examined the effects of extended sessions of heavy intermittent exercise on quadriceps muscle fatigue and weakness. Twelve untrained volunteers (10 men and 2 women), with a peak oxygen consumption of 44.3 ± 2.3 ml·kg−1·min−1, exercised at ∼91% peak oxygen consumption for 6 min once per hour for 16 h. Muscle isometric properties assessed before and after selected repetitions (R1, R2, R4, R7, R12, and R15) were used to quantitate fatigue (before vs. after repetitions) and weakness (before vs. before repetitions). Muscle fatigue at R1 was indicated by reductions ( P < 0.05) in peak twitch force (135 ± 13 vs. 106 ± 11 N) and by a reduction ( P < 0.05) in the force-frequency response, which ranged between ∼53% at 10 Hz (113 ± 12 vs. 52.6 ± 7.4 N) and ∼17% at 50 Hz (324 ± 27 vs. 270 ± 30 N). No recovery of force, regardless of stimulation frequency, was observed during the 54 min between R1 and R2. At R2 and for all subsequent repetitions, no reduction in force, regardless of stimulation frequency, was generally found after the exercise. The only exception was for R2, where, at 20 Hz, force was reduced ( P < 0.05) by 18%. At R15, force before repetitions for high frequencies (i.e., 100 Hz) returned to R1 (333 ± 29 vs. 324 ± 27 N), whereas force at low frequency (i.e., 10 Hz) was only partially ( P < 0.05) recovered (113 ± 12 vs. 70 ± 6.6 N). It is concluded that multiple sessions of heavy exercise can reverse the fatigue noted early and reduce or eliminate weakness depending on the frequency of stimulation.

Oxygen Consumption by the Sea Anemone Calliactis Parasitica (Couch)

1980 ◽  
Vol 88 (1) ◽  
pp. 367-374
Author(s):  
A. E. BRAFIELD
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Concentration ◽  
Low Frequency ◽  
High Amplitude ◽  
Total Oxygen ◽  
Strip Chart ◽  
Calliactis Parasitica ◽  
Cycle Lengths ◽  
Mean Cycle ◽  
Low Amplitude

Oxygen consumption by Calliactis parasitica, measured in a continuousflow polarographic respirometer, yielded a slope of 0·92 when plotted against body weight on log scales. This high value is discussed in terms of the sea anemone's basically laminate nature. Strip-chart records of the oxygen concentration of water which had just passed a specimen of Calliactis commonly showed rhythmic fluctuations, either of low amplitude and high frequency or high amplitude and low frequency (mean cycle lengths 11 and 34 min respectively). The fluctuations are explained in terms of rhythmic muscular contractions which irrigate the enteron for respiratory purposes. Analysis of the slow fluctuations indicates that the endoderm is responsible for about 18% of the total oxygen consumption. The oxygen concentration of water in the enteron, measured and recorded continuously, was 4–27% of the air-saturation level. These strip chart records also frequently showed rhythmic fluctuations (mean cycle length 12 min), apparently resulting from the muscular contractions.

Fatigue Increases in Resting Muscle Oxygen Consumption after a Women’s Soccer Match

2020 ◽  
Author(s):  
Aldo Alfonso Vasquez Bonilla ◽  
Rafael Timon ◽  
Alba Camacho-Cardeñosa ◽  
Marta Camacho-cardeñosa ◽  
Samantha Guerrero ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Muscle Pain ◽  
Perceived Exertion ◽  
Arterial Occlusion ◽  
Muscle Oxygenation ◽  
Soccer Match ◽  
Muscle Oxygen ◽  
Muscle Oxygen Consumption ◽  
Resting Muscle ◽  
Women's Soccer

AbstractCurrently, near infrared spectroscopy has a clear potential to explain the mechanisms of fatigue by assessing muscle oxygenation. The objective of the study was to observe the changes in muscle oxygen consumption after an official women’s soccer match. The sample was 14 players who competing in the second division of Spain of women’s soccer. They were evaluated before, immediately after and 24 h after the official match. Biochemical parameters were measured in blood plasma (BUN, GOT, LDH, CPK). The jumping in countermovement, perceived exertion and perceived muscle pain were also assessed. The muscle oxygen consumption and muscle oxygen saturation were evaluated in the gastrocnemius muscle with an arterial occlusion test. ANOVA of repeated measures, Pearson’s correlation and Hopkins’ statistics were applied to measure the magnitudes of change and effect size. There was observed an increase in kinetics of SmO2 at 24 h after the official match, using arterial occlusion. In addition, it was found that the increase in muscle oxygenation correlated with fatigue indicators, such as the increases in LDH, perceived muscle pain and the decrease in countermovement. It is confirmed that a women’s soccer match produced an increase of resting muscle oxygenation in 24 h after the official match.

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