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Biomedical subjects

M Vanderthommen

Publications and source records attributed to M Vanderthommen.

8 recordsLinked to original sources
PubMed2002

A comparison of voluntary and electrically induced contractions by interleaved 1H- and 31P-NMRS in humans.

Skeletal muscle voluntary contractions (VC) and electrical stimulations (ES) were compared in eight healthy men. High-energy phosphates and myoglobin oxygenation were simultaneously monitored in the quadriceps by interleaved (1)H- and (31)P-NMR spectroscopy. For the VC protocol, subjects performed five or six bouts of 5 min with a workload increment of 10% of maximal voluntary torque (MVT) at each step. The ES protocol consisted of a 13-min exercise with a load corresponding to 10% MVT. For both protocols, exercise consisted of 6-s isometric contractions and 6-s rest cycles. For an identical mechanical level (10% MVT), ES induced larger changes than VC in the P(i)-to-phosphocreatine ratio [1.38 +/- 1.14 (ES) vs. 0.13 +/- 0.04 (VC)], pH [6.69 +/- 0.11 (ES) vs. 7.04 +/- 0.07 (VC)] and myoglobin desaturation [43 +/- 15.9 (ES) vs. 6.1 +/- 4.6% (VC)]. ES activated the muscle facing the NMR coil to a greater extent than did VCs when evaluated under identical technical conditions. This metabolic pattern can be interpreted in terms of specific temporal and spatial muscle cell recruitment. Furthermore, at identical levels of energy charge, the muscle was more acidotic and cytoplasm appeared more oxygenated during ES than during VC. These results are in accordance with a preferential recruitment of type II fibers and a relative muscle hyperperfusion during ES.

Adenosine Diphosphate↗
PubMed2001

[Validation of an evaluation test of activities of daily living behaviour for patients with chronic low back pain].

AIM: The purpose of this study was to validate an evaluation test of the gesture behaviour for patients with chronic low back pain. METHOD: Forty-four patients (19 females and 25 males) (45.7 +/- 10.8 years) with chronic low back pain (delay of pain: 9.8 +/- 9.0 years) took part in an educational back school program. They performed 3 tests at the beginning (pre-test), at the end (post-test) and three months after the back school program (control): a visual analogic scale, the Dallas questionnaire and a gesture evaluation test that is composed of three tasks for the pre-test and five tasks for the post-test and the control session. RESULTS: Our gesture test was reproducible and sensible. The mean gesture result increased significantly after the back school program (39.6 +/- 23.2 % in the pre-test and 73.4 +/- 12.5 % in the post-test, p < 0.05) and was stabilized at this high level (69 +/- 18.8 %) for the control session. The patients demonstrated abilities to transfer an appropriate gesture behaviour to new tasks. DISCUSSION AND CONCLUSION: This study validated a gesture behaviour test for the patient with chronic low back pain. The use of this test during a back school program demonstrated an immediate and long lasting effect on the appropriate gesture behaviour. However the algo-functional status was increased more belatedly and more modestly.

Activities of Daily Living↗
PubMed2001

[Muscle electric stimulation in sports medicine].

Neuromuscular electrical stimulation (NMES) is frequently used to strengthen the normal muscle. In medicine, several investigators have highlighted the value of NMES when treating amyotrophy related to immobilization. The efficacy of NMES of the quadriceps during rehabilitation following anterior cruciate ligament surgery has been well documented. These electrical stimulation programs are composed of stimulation--rest cycles and are performed with the aid of percutaneous electrodes situated in regard to muscle motor points. The stimulation frequency is chosen to induce tetanic contractions and is generally situated between 50 and 100 Hz. During NMES, the trainer or the physiotherapist can accurately modulate a large number of parameters but the sensory discomfort linked to the current intensity remains the major limitation for strength improvement. In the context of rehabilitation, the association of NMES with voluntary exercises is superior to the isolated utilization of the classic program composed of isometric voluntary contractions. To explain this advantage of associating NMES with voluntary contractions, it has been hypothesized that the electrically induced contractions impose specific patterns of muscle recruitment and a particular metabolic solicitation.

Anterior Cruciate Ligament Injuries↗
PubMed2000

Spatial distribution of blood flow in electrically stimulated human muscle: a positron emission tomography study.

Neuromuscular electrical stimulation (NMES) was studied with positron emission tomography (PET) and H(2)(15)O in the quadriceps muscle of 11 men. The subjects were submitted to simultaneous bilateral isometric contraction (5 s)-rest (5 s) cycles for 12 min, with a workload corresponding to 5% of quadriceps maximal isometric voluntary torque (QMIVT) for one thigh (5%T) and 10% of QMIVT for the other (10%T). Scans were centered at the electrodes and tissue blood flow (TBF) was evaluated in square regions of interest (ROIs) (3.5 cm(2)) in the transverse section (TS) of both thighs. The mean TBF reached 8.9 mL min(-1) 100 g(-1) in the TS of the 5%T and 11.5 mL min(-1) 100 g(-1) in the TS of the 10%T (P > 0.05). A negative linear relationship was found for both thighs between the ROI-electrode distance and the TBF (P </= 0.009). The mean percentage of activated ROIs (TBF > 5 mL min(-1) 100 g(-1)) was lower in the 5%T than in the 10%T (50.6% vs. 62.2%; P = 0.017). With NMES, the pattern of spatial recruitment appears linked to electrode proximity and is spatially extended. These results confirm the utility of combining NMES with voluntary exercise in the treatment of atrophied muscle.

Adult↗
PubMed1999

Human muscle energetics during voluntary and electrically induced isometric contractions as measured by 31P NMR spectroscopy.

Electrical stimulation (ES) and voluntary contraction (VC) were compared in the quadriceps muscle of ten male volunteers. In both modes, a workload corresponding to 20% of maximal voluntary contraction was applied during 64 isometric contraction (5.5 s)-relaxation (5.5 s) cycles. The protocols were performed in a 1.5 T whole-body magnet. The Pi/PCr ratio and the intracellular pH (pHi) were monitored by 31P NMR spectroscopy during baseline, exercise and recovery periods, in a superficial region of the vastus medialis. During baseline, the Pi/PCr ratio (0.12 vs. 0.10) and the pHi (7.01 vs. 7.00) were comparable in both conditions. During exercise, the Pi/PCr ratio was higher (0.36 vs. 0.14) and the pHi was lower (6.85 vs. 7.07) during ES than during VC. For the same external work production, these results reflect a different metabolic solicitation in the ES quadriceps than in the VC ones.

Adult↗
PubMed1997

Measurement of the power output during the acceleration phase of all-out arm cranking exercise.

The purpose of this study was to develop an original friction loaded ergometer allowing measurement of the resisting torque (Mb) and the angular velocity (omega) by means of a force transducer and an optical pick-up during all-out arm cranking exercises. Taking into account the kinetic energy variations of the flywheel, the peak power developed at the crank (P(c)peak) and the peak angular velocity (omegapeak) were determined in 6 male and 6 female able-bodied subjects during 6-8 bouts of 3 s duration, performed at maximal velocity, with Mb varying from 0.07 to 0.87 Nm x kg(-1). In each subject, the Mb increase was related to a decrease of omegapeak. This relationship was expressed through a negative linear regression (0.92 < R2 < 0.99) for omegapeak between 13 and 28 rad x s(-1) for the males and 10 and 24 rad x s(-1) for the females. The relationship between P(c)peak and Mb did not fit well for all subjects (0.01 < R2 < 0.93) with a parabolic equation, indicating that for upper limb testing, the maximal power should be defined as the highest power measured during several bouts performed with appropriate resisting torque. The present study also demonstrated the importance of taking into account the inertia of the moving flywheel during the acceleration phase of an all-out arm crank exercise, when determining the peak power output.

Acceleration↗
PubMedDate not supplied

[Recommendations for a basic functional assessment of low back pain].

This article aims to recommend easy, reproducible and valid physical tests and questionnaires to allow a functional and physical assessment of sub-acute and chronic low back pain patients. We recommend the pain visual analogue scale, the French translation of the Roland-Morris Disability Questionnaire (EIFEL) and the Dallas questionnaire to appreciate pain intensity and its influence on patients' quality of life. Sorensen's test is recommended in order to assess trunk extensor muscles endurance. We suggest to measure pelvic and lumbar flexion mobility by means of the inclinometer technique. The test described by McQuade is recommended to assess abdominal muscles static endurance.

Humans↗