Abstract
Background. To assess how muscle ischaemia and isometric fatiguing contraction influence oxygen content in striated muscle. Methods. We simultaneously measured changes in hemoglobin near-infrared (NIR) spectroscopy and in surface EMG before, during, and after muscle ischaemia and ischaemia plus muscle isometric fatiguing contraction. Seventeen health male subjects (age range: 19-40 yrs) were examined in our Clinical Neurophysiology Unit. Test I (9 subjects): hemoglobin NIR spectroscopy and stimulated surface EMG were measured for 2 minutes at rest, for 4 minutes during complete ischaemia of tibialis anterior muscle, and for twelve minutes during recovery. Test II (all subjects): hemoglobin NIR spectroscopy and surface EMG were measured for 2 minutes with the subjects performing brief non-fatiguing contractions, for 4 minutes with the subject performing maximal isometric contraction in complete ischaemia, and for twelve minutes during recovery. EMG parameters measured: median density frequency (MDF); muscle fiber conduction velocity (MFCV). NIR spectroscopy parameters measured: percentage of amplitude decrement (%AD) and nadir time (NT) during ischaemia and ischaemic effort; half-recovery time ( 1/2 RT) from ischaemia effort. Results. At EMG, we observed a significant shift towards lower values of both MFCV and MDF during fatiguing isometric contraction. MDF recovery was faster then MFCV recovery. At NIR spectroscopy, the 1/2 RT slowed a fast pattern in twelve subjects and a slow pattern in five. A significant relationship was found between AD% and 1/2 RT values of test I and AD% and 1/2 values of test II. We found a positive relationship between NT and 1/2 RT in test II. Conclusions. Surface EMG and hemoglobin NIR spectroscopy can be applied simultaneously to evaluate both fatigue intensity and blood flow changes in striated muscle.
| Original language | English |
|---|---|
| Pages (from-to) | 83-92 |
| Number of pages | 10 |
| Journal | Journal of Sports Medicine and Physical Fitness |
| Volume | 39 |
| Issue number | 2 |
| Publication status | Published - Jun 1999 |
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Keywords
- Electromyography methods
- Muscle, skeletal blood supply
- Myoelectrical signal
- Spectroscopy, near infrared
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health
- Physical Therapy, Sports Therapy and Rehabilitation
- Orthopedics and Sports Medicine
Cite this
Hemoglobin near-infrared spectroscopy and surface EMG study in muscle ischaemia and fatiguing isometric contraction. / Alfonsi, E.; Pavesi, R.; Merlo, I. M.; Gelmetti, A.; Zambarbieri, D.; Lago, P.; Arrigo, A.; Reggiani, C.; Moglia, A.
In: Journal of Sports Medicine and Physical Fitness, Vol. 39, No. 2, 06.1999, p. 83-92.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Hemoglobin near-infrared spectroscopy and surface EMG study in muscle ischaemia and fatiguing isometric contraction
AU - Alfonsi, E.
AU - Pavesi, R.
AU - Merlo, I. M.
AU - Gelmetti, A.
AU - Zambarbieri, D.
AU - Lago, P.
AU - Arrigo, A.
AU - Reggiani, C.
AU - Moglia, A.
PY - 1999/6
Y1 - 1999/6
N2 - Background. To assess how muscle ischaemia and isometric fatiguing contraction influence oxygen content in striated muscle. Methods. We simultaneously measured changes in hemoglobin near-infrared (NIR) spectroscopy and in surface EMG before, during, and after muscle ischaemia and ischaemia plus muscle isometric fatiguing contraction. Seventeen health male subjects (age range: 19-40 yrs) were examined in our Clinical Neurophysiology Unit. Test I (9 subjects): hemoglobin NIR spectroscopy and stimulated surface EMG were measured for 2 minutes at rest, for 4 minutes during complete ischaemia of tibialis anterior muscle, and for twelve minutes during recovery. Test II (all subjects): hemoglobin NIR spectroscopy and surface EMG were measured for 2 minutes with the subjects performing brief non-fatiguing contractions, for 4 minutes with the subject performing maximal isometric contraction in complete ischaemia, and for twelve minutes during recovery. EMG parameters measured: median density frequency (MDF); muscle fiber conduction velocity (MFCV). NIR spectroscopy parameters measured: percentage of amplitude decrement (%AD) and nadir time (NT) during ischaemia and ischaemic effort; half-recovery time ( 1/2 RT) from ischaemia effort. Results. At EMG, we observed a significant shift towards lower values of both MFCV and MDF during fatiguing isometric contraction. MDF recovery was faster then MFCV recovery. At NIR spectroscopy, the 1/2 RT slowed a fast pattern in twelve subjects and a slow pattern in five. A significant relationship was found between AD% and 1/2 RT values of test I and AD% and 1/2 values of test II. We found a positive relationship between NT and 1/2 RT in test II. Conclusions. Surface EMG and hemoglobin NIR spectroscopy can be applied simultaneously to evaluate both fatigue intensity and blood flow changes in striated muscle.
AB - Background. To assess how muscle ischaemia and isometric fatiguing contraction influence oxygen content in striated muscle. Methods. We simultaneously measured changes in hemoglobin near-infrared (NIR) spectroscopy and in surface EMG before, during, and after muscle ischaemia and ischaemia plus muscle isometric fatiguing contraction. Seventeen health male subjects (age range: 19-40 yrs) were examined in our Clinical Neurophysiology Unit. Test I (9 subjects): hemoglobin NIR spectroscopy and stimulated surface EMG were measured for 2 minutes at rest, for 4 minutes during complete ischaemia of tibialis anterior muscle, and for twelve minutes during recovery. Test II (all subjects): hemoglobin NIR spectroscopy and surface EMG were measured for 2 minutes with the subjects performing brief non-fatiguing contractions, for 4 minutes with the subject performing maximal isometric contraction in complete ischaemia, and for twelve minutes during recovery. EMG parameters measured: median density frequency (MDF); muscle fiber conduction velocity (MFCV). NIR spectroscopy parameters measured: percentage of amplitude decrement (%AD) and nadir time (NT) during ischaemia and ischaemic effort; half-recovery time ( 1/2 RT) from ischaemia effort. Results. At EMG, we observed a significant shift towards lower values of both MFCV and MDF during fatiguing isometric contraction. MDF recovery was faster then MFCV recovery. At NIR spectroscopy, the 1/2 RT slowed a fast pattern in twelve subjects and a slow pattern in five. A significant relationship was found between AD% and 1/2 RT values of test I and AD% and 1/2 values of test II. We found a positive relationship between NT and 1/2 RT in test II. Conclusions. Surface EMG and hemoglobin NIR spectroscopy can be applied simultaneously to evaluate both fatigue intensity and blood flow changes in striated muscle.
KW - Electromyography methods
KW - Muscle, skeletal blood supply
KW - Myoelectrical signal
KW - Spectroscopy, near infrared
UR - http://www.scopus.com/inward/record.url?scp=0033056012&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033056012&partnerID=8YFLogxK
M3 - Article
C2 - 10399414
AN - SCOPUS:0033056012
VL - 39
SP - 83
EP - 92
JO - Journal of Sports Medicine and Physical Fitness
JF - Journal of Sports Medicine and Physical Fitness
SN - 0022-4707
IS - 2
ER -