title: [Is there any correlation between the strength of pronation and supination of the dominant hand and that of the non-dominant one in right-handed healthy adults: preliminary results].
abstract: We searched the existence of a link between the strength of pronation and supination of the dominant forearm and those of the non-dominant one. Ninety-seven volunteers were tested in pronation and supination with an analog dynamometer. Gender, age, dominance, height and weight were recorded. The measurement position was: 90° of elbow flexion, 0° of shoulder abduction, wrist slightly extended and neutral pronation-supination. We took four measurements per patient: strength in pronation and supination, in both the dominant and non-dominant sides. Fifteen subjects were evaluated twice. The left-handed (4) were removed from the statistical analysis. There were 38 men (37 years, 18-66) and 55 women (45 years, 21-71). Torques were higher (P<0.05) in men than in women, higher in supination than in pronation and in the dominant side compared to the non-dominant one (average ratio "non-dominant/dominant": 0.85; σ=0.16). There was a strong correlation between non-dominant hand strength and dominant hand strength (Pearson>0.6). Relating to the 15 subjects evaluated twice, the value of the forces varied during the day, but the ratio "non-dominant/dominant" was constant. The left-handed people were excluded, their values may be different from those of right-handers, as has been shown for grip strength. There was a strength variation during the day, but the ratio "non-dominant/dominant" was constant, making it more relevant intra-individual comparison (non-dominant side versus dominant side) rather inter-individual (based on charts of gender, age, weight and height). In the right-handed, the ratio "strength non-dominant side/dominant" is constant, defining easily in consultation the expected value of recovery of an injured forearm.
authors.affiliation: CHU Jean-Minjoz, 3, boulevard Fleming, 25000 Besançon, France. Electronic address: pb.rey@wanadoo.fr.
authors.forename: P-B
authors.initials: PB
authors.lastname: Rey
authors.affiliation: CHU Jean-Minjoz, 3, boulevard Fleming, 25000 Besançon, France. Electronic address: manue.jardin@hotmail.fr.
authors.forename: E
authors.initials: E
authors.lastname: Jardin
authors.affiliation: CHU Jean-Minjoz, 3, boulevard Fleming, 25000 Besançon, France. Electronic address: jul.uhr@live.fr.
authors.forename: J
authors.initials: J
authors.lastname: Uhring
authors.affiliation: CHU Jean-Minjoz, 3, boulevard Fleming, 25000 Besançon, France. Electronic address: laurentobert@yahoo.fr.
authors.forename: L
authors.initials: L
authors.lastname: Obert
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D004576:Electromyography; D005260:Female; D005542:Forearm / Q000502:physiology*; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D053581:Muscle Strength Dynamometer; D011403:Pronation; D016059:Range of Motion, Articular; D015203:Reproducibility of Results; D012737:Sex Factors; D013484:Supination; D019415:Torque; D014953:Wrist
keywords: Dynamometer; Dynamomètre; Poignet; Pronation-supination; Pronator quadratus; Pronator teres; Wrist