[Effects of various load intensities in the framework of postoperative stationary endurance training on performance deficit of the quadriceps muscle of the thigh]. / Auswirkungen unterschiedlicher Belastungsintensitäten im Rahmen eines postoperativen stationären Aufbautrainings auf Leistungsdefizite des M.quadriceps femoris.

The development of a muscular hypertrophy represents one of the most important purpose in a postoperative training. With the example of an isokinetic training the present study was meant to record if the choice of the load intensity is of importance in this connection. 36 patients with an anterior crucial ligament rupture, who were divided into three groups, underwent a stationary training for a period of four weeks. Thereby it could be proved that high intensity mainly influences the intramuscular coordination while the load intensity is far less relevant to the influence on a muscular cross-section. In this connection rather the total extent of practice time makes up the specific stimulus for a hypertrophy.

[Lack of fatigue of the musculature in patients after immobilization--a paradox?]. / Fehlende Ermüdung der Muskulatur bei Patienten nach Immobilisation--ein Paradoxon?

The isometric strength of knee extensors was measured in patients six weeks after cruciate ligament surgery over a contraction period of 30 sec. The characteristics of the graph obtained form the measurement system were compared to the graphs of uninjured knee extensor muscles. Apart from strength reductions, as expected for atrophic muscle, the pattern of the strength graph led to the impression that these muscles did not fatigue during prolonged contraction. This paradoxical phenomenon can be explained by the existence of central inhibitory mechanisms.

[Muscle stress of rehabilitation-oriented concentric and concentric-eccentric implemented isokinetic training]. / Muskuläre Belastung eines rehabilitativ orientierten konzentrisch sowie eines konzentrisch-exzentrisch durchgeführten isokinetischen Trainings.

The method of lactate diagnostics is used to compare the isokinetic concentric and eccentric work pattern in conjunction with relevant muscular stress. Therefore two training groups performed at isokinetic velocity spectra of 90 degrees/s, 120 degrees/s, 150 degrees/s and 180 degrees/s four series each. The factor "work" was kept identical by performing the same training extent. Over the four series it turned out that the eccentric training group had a continuously higher lactate value of 0.5 mmol/l than the concentric training group used as comparison. The results of both groups gave a similar lactate concentration during practice. Nevertheless it showed that a two minute break is not sufficient to initiate a regeneration process.