Isometrische Maximalkraftmessungen der Quadrizepsmuskulatur

Summary

The quadriceps femoris muscle (QF) plays an important role in locomotion. However, assessing the total number of attempts to evaluate the maximal isometric strength (Fmax_iso) regarding reliability and feasibility remain less characterised. Patients, methods: 28 patients with haemophilia (H) (26 severe, 2 moderate) and 27 healthy controls (C) matched for age (H: 44 ± 11, C: 42 ± 12) and anthropometric data were measured separately for the left and right leg for Fmax_iso of QF using m3 diagnos (SCHNELL^®). We repeated the Fmax_iso measures after 48 h in 14 H and 13 C. Results: The system m3 diagnos showed strong reliability (ICC = 1.0; SEM = 0.0; CA = 1.0). H and C demonstrated significant differences in Fmax_iso (H r = 153 Nm, l = 164 Nm; K r= 289 Nm, l = 280 Nm; p ≤ 0.001). Additionally, H and C revealed significant differences between the 1^st and 3^rd to 6^th attempts. No differences were observed between the 3^rd, 4^th, 5^th and 6^th attempts. Conclusion: Both groups showed high test-retest-reliability of Fmax_iso (ICC/SEM: H l = 0.98/7.1 r = 0.99/4.9; K l = 0.69/11.3 r = 0.95/5.8). Starting from the 3^rd attempt, reliable measurements of the Fmax_iso in patients suffering from severe haemophilia are feasible.

Zusammenfassung

Der M. quadriceps femoris (QF) hat eine elementare Bedeutung in der gesamten Bewegungsfunktion. Unklar ist, wie zuverlässig Maximalkraftmessungen bei hämophilen Patienten sind und wie viele Messversuche zur Erfassung der maximalen isometrischen Maximalkraft (Fmax_iso) des QF notwendig sind. Patienten, Methoden: Die Fmax_iso des QF wurde von 28 hämophilen Patienten (H) (26 schwer, 2 mittelschwer; Alter: 44 ± 11) sowie 27 Kontrollpersonen (K) (Alter: 42 ± 12) für beide Beine getrennt mit dem Testgerät m3 diagnos (SCHNELL^®) erfasst. Bei 14 H und 13 K wurde die Bestimmung der Fmax_iso nach 48 h wiederholt. Ergebnisse: Die Messapparatur erwies sich als reliabel (ICC = 1,0; SEM = 0,0; CA = 1,0). H zeigten beidseits eine signifikant geringere Fmax_iso als K (H re = 153 Nm, li = 164 Nm; K re = 289 Nm, li = 280 Nm; p ≤ 0,001). Im ersten Versuch wurden in H und K signifikant niedrigere Fmax_iso erzielt als in den Versuchen 3 bis 6, die sich nicht signifikant unterschieden (p > 0,05). Schlussfolgerung: Für beide Gruppen lag eine hohe Test-RetestReliabilität (ICC/SEM: H li = 0,98/7,1 re = 0,99/4,9; K li = 0,69/11,3 re = 0,95/5,8) der Fmax_iso vor. Die reliable Erfassung der Fmax_iso ist bei schwerer Hämophilie ab dem dritten Messversuch möglich.

Keywords

Haemophilia - quadriceps - isometric strength - reliability

Schlüsselwörter

Hämophilie - Quadrizeps - isometrische Kraft - Reliabilität

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