Body physique and dominant somatotype in elite and low-profile athletes with different specializations.

BACKGROUND AND OBJECTIVE: Somatotyping is helpful in sports in which the body shape could influence the resulting performance. The purpose of this study was to determine the somatotype of high profile Lithuanian athletes in kayaking, basketball and football and to compare between disciplines and with low level sportsmen of the same age. MATERIALS AND METHODS: A total of 72 young male sportsmen aged from 18 to 24 years were divided into three groups (kayakers, basketball and football players). Each group contained almost equal numbers of low level and elite, international level sportsmen. Anthropometric measurements of the players were used to establish somatotypes. RESULTS: The greatest difference was observed in the mesomorphic component of elite kayakers compared to the low profile sportsmen. Mesomorphy could also be used to predict sport ability. The range of mesomorphy for elite footballers was from 0 to 4.6, for basketball players from 4.6 to 5.9, and for kayaking, from 5.9 and higher. Individual groups of elite sportsmen displayed different modes of somatotype. The kayakers were predominantly endomorphic; the basketball players mostly endomorphic and the footballers most often ectomorphic. No distinguishable patterns of somatotype were displayed by the low level sportsmen. CONCLUSIONS: Morphometric characteristics of the athlete's body and the fractional somatotype can be used as guiders and markers of the chosen sport and method of training. The results emphasize the necessity for a specific somatotype to reach a high profile in the selected area of sport and thus support morphometric oriented studies. Further studies could elucidate differentiation by age and sex.

Inferred influence of human lateral profile on limb load asymmetry during a quiet standing balance test.

Although the identification and characterisation of a participant's lateral profile during quiet standing have not received much research attention, they have the potential to greatly extend our understanding of upright stance stability control. This study further examines limb load asymmetries during quiet bipedal stance. During voluntary frontal-plane weight shifting for 2 min, 300 centre-of-pressure displacements on 14 blindfolded right-handed young adults were recorded. Four biomechanical indices were used to assess postural behaviour. These were the bias of time and the magnitude of the partial ground reaction forces from both legs, and the bias in the number and magnitude of microshifts influencing stability. Our study identifies a significant level of asymmetry in the quiet bipedal stance of right-handed people. This asymmetry is associated with the right-sided bias of the ground reaction force and the angle of inclination to the upright (vertical) centroidal line. We found that the initial lateralisation of the partial ground reaction forces from both feet, as well as the period of ground reaction force bias, are important elements in any clinical tests involving quiet bipedal stance.

Power of performance of the thumb adductor muscles: effect of laterality and gender.

The aim of this work was to originally measure mechanical power output of the thumb adductor muscles during fast adduction of the thumb in the horizontal plane. This information will contribute to biomechanical guidelines to help clinicians, sport medicine and rehabilitation specialists in the objective functional evaluation of abnormalities of thumb adductors. Participants performed 20 fast adductions in response to audio signals. Maximum and average angular velocity and angular acceleration were measured. Tangential components of these parameters were then derived. The force of adduction was obtained from the tangential acceleration and the mass of the rotational system. The power was then calculated as the product of the force of adduction and average tangential velocity during the acceleration phase of adduction. All young and untrained males and females were strictly right handed. There was no significant difference in power between dominant and nondominant muscles for either males or females, but males developed significantly more power than females. Because adduction was performed at maximal speed, these data may be explained by the influence of parallel and series elastic elements in the muscle, as well as by influence of fast twitch fibers. Power may be used as a clinical index of the effectiveness of muscle contraction. The similarity of power outputs from dominant and nondominant thumb adductor muscles of right-handers can suggest a classical Bernstein approach. This theoretical approach purports that peripheral factors can distort central commands projected to dominant and nondominant extremities.

The effect of effleurage massage in recovery from fatigue in the adductor muscles of the thumb.

OBJECTIVE: The aim of this study was to investigate the effect of local effleurage massage on the recovery from fatigue in the small hand muscles. METHODS: This study was a within-subject repeated measure design. Twelve healthy, right-handed volunteer male subjects with a mean age of 25 +/- 2.8 years were recruited into the study from a university population. Subjects were randomly allocated to a rest or massage protocol. Subjects undertook the alternate protocol at a subsequent session. All subjects underwent baseline dynamometry testing of isometric thumb adduction (nondominant hand) before undertaking a fatigue-inducing task of the thumb adductors. Subjects then underwent either 5 minutes of massage applied to the first dorsal interspace or 5 minutes of rest. Subjects were then retested. RESULTS: The maximal force recorded after the massage protocol was not significantly different from the maximal force recorded after the rest protocol, with a mean difference of only 0.63 N (95% confidence interval, -12.55 to 13.80 N; P = .92). The maximal gradient of force development after the massage protocol was not significantly different from the maximal gradient recorded after the rest protocol, with a mean decrease in gradient of 19.48 N/s (95% confidence interval, -117.33 to 156.30 N; P = .77). CONCLUSIONS: Effleurage massage was not an effective intervention for enhancing the restoration of postfatigue F(max) and G(max) in the small muscles of the hand. The wide variation in response to this massage protocol may support the notion that there is no universal effect of effleurage massage in enhancing recovery from fatigue.