PMID- 17909840
OWN - NLM
STAT- MEDLINE
DCOM- 20090227
LR  - 20211020
IS  - 1439-6327 (Electronic)
IS  - 1439-6319 (Linking)
VI  - 102
IP  - 1
DP  - 2007 Dec
TI  - Resting mechanomyography before and after resistance exercise.
PG  - 107-17
AB  - A number of mechanisms have been proposed to explain the elevation in oxygen 
      consumption following exercise. Biochemical processes that return muscle to its 
      pre-exercise state do not account for all of the extra oxygen consumed after 
      exercise (excess post-exercise oxygen consumption, EPOC). Muscle at rest after 
      aerobic exercise produces mechanomyographic (MMG) activity of increased 
      amplitude, compared to the pre-exercise state, which declines exponentially with 
      the same time constant as EPOC. The purpose of this study was to determine how 
      the resting MMG is affected by resistance exercise, and whether any change is 
      related to oxygen consumption (VO(2)). Ten young male subjects (22.9 years) 
      performed 30 min of resistance exercise consisting of one set of 10 repetitions 
      at 50% 1-repetition maximum (1-RM) followed by five sets of eight repetitions at 
      75% of 1-RM for leg press and leg (knee) extension, with 1 min rest between sets. 
      Oxygen consumption was measured by indirect calorimetry, MMG by an accelerometer 
      placed over the rectus femoris, and surface electromyogram (EMG) with electrodes 
      placed distal to the accelerometer. Recordings were made before exercise and for 
      5.5 h after exercise. MMG activity, expressed as mean absolute acceleration, was 
      significantly elevated after exercise (P = 0.0006), as was EMG activity expressed 
      as root-mean-square voltage (P = 0.03). MMG and VO(2) demonstrated exponential 
      decay after exercise with similar time constants of 7.5 +/- 2.2 and 7.2 +/- 1.0 
      min, respectively. We conclude that resting muscle is more mechanically active 
      following resistance exercise and that this may contribute to an elevated VO(2).
FAU - McKay, William P S
AU  - McKay WP
AD  - Department of Anesthesia, University of Saskatchewan, Saskatoon, Saskatchewan, 
      Canada. william.mckay@saskatoonhealthregion.ca
FAU - Chilibeck, Philip D
AU  - Chilibeck PD
FAU - Daku, Brian L F
AU  - Daku BL
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20071002
PL  - Germany
TA  - Eur J Appl Physiol
JT  - European journal of applied physiology
JID - 100954790
SB  - IM
MH  - Adaptation, Physiological/physiology
MH  - Adult
MH  - Exercise Test
MH  - Humans
MH  - Male
MH  - Monitoring, Physiologic/methods
MH  - Muscle Contraction/*physiology
MH  - Muscle, Skeletal/*physiology
MH  - Oxygen Consumption/*physiology
MH  - Physical Exertion/*physiology
MH  - Rest/*physiology
EDAT- 2007/10/03 09:00
MHDA- 2009/02/28 09:00
CRDT- 2007/10/03 09:00
PHST- 2007/09/17 00:00 [accepted]
PHST- 2007/10/03 09:00 [pubmed]
PHST- 2009/02/28 09:00 [medline]
PHST- 2007/10/03 09:00 [entrez]
AID - 10.1007/s00421-007-0578-5 [doi]
PST - ppublish
SO  - Eur J Appl Physiol. 2007 Dec;102(1):107-17. doi: 10.1007/s00421-007-0578-5. Epub 
      2007 Oct 2.