Hemoglobin near-infrared spectroscopy and surface EMG study in muscle ischaemia and fatiguing isometric contraction

E. Alfonsi, R. Pavesi, I. M. Merlo, A. Gelmetti, D. Zambarbieri, P. Lago, A. Arrigo, C. Reggiani, A. Moglia

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)83-92
Number of pages10
JournalJournal of Sports Medicine and Physical Fitness
Volume39
Issue number2
Publication statusPublished - Jun 1999

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Isometric Contraction
Near-Infrared Spectroscopy
Hemoglobins
Ischemia
Muscles
Striated Muscle
Neurophysiology
Fatigue
Oxygen
Health

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 journalArticle

Alfonsi, E, Pavesi, R, Merlo, IM, Gelmetti, A, Zambarbieri, D, Lago, P, Arrigo, A, Reggiani, C & Moglia, A 1999, 'Hemoglobin near-infrared spectroscopy and surface EMG study in muscle ischaemia and fatiguing isometric contraction', Journal of Sports Medicine and Physical Fitness, vol. 39, no. 2, pp. 83-92.
Alfonsi, E. ; Pavesi, R. ; Merlo, I. M. ; Gelmetti, A. ; Zambarbieri, D. ; Lago, P. ; Arrigo, A. ; Reggiani, C. ; Moglia, A. / Hemoglobin near-infrared spectroscopy and surface EMG study in muscle ischaemia and fatiguing isometric contraction. In: Journal of Sports Medicine and Physical Fitness. 1999 ; Vol. 39, No. 2. pp. 83-92.
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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.",
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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.

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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.

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