PubMed Health⌕ Search

Biomedical subjects

M A Roberton

Publications and source records attributed to M A Roberton.

7 recordsLinked to original sources
PubMed2001

Predicting children's overarm throw ball velocities from their developmental levels in throwing.

This study examined the movement process-product relationship from a developmental perspective. The authors used multiple regression to investigate the changing relationship between qualitative movement descriptions of the overarm throw and the throwing outcome, horizontal ball velocity. Seventeen girls and 22 boys were filmed longitudinally at ages 6, 7, 8, and 13 years. Their movements were assessed using Roberton's (Roberton & Halverson, 1984) developmental sequences for action of the humerus, forearm, trunk, stepping, and stride length. The sequences accounted for 69-85% (adjusted) of the total velocity variance each year. The components that best predicted ball velocity changed over time, although humerus or forearm action always accounted for considerable variance. Gender was a good predictor of ball velocity, but if the developmental descriptions were entered first in a stepwise regression, gender then explained no more than 2% additional variance.

Adolescent↗
PubMed1995

The paradox of the contented working woman in intercollegiate athletics administration.

We investigated the paradox of the contented working woman among middle and first-line intercollegiate athletics administrators. In this paradox, women report lower salaries than men but express comparable job satisfaction. The sample comprised 143 women and 371 men in 106 National Collegiate Athletic Association (NCAA) Division I-A institutions. Job satisfaction was measured with the Job Descriptive Index (Smith, Kendall & Hulin, 1969) and Job in General (Ironson, Smith, Brannick, Gibson & Paul, 1989) scales. Analyses revealed the existence of the paradox: Women were paid significantly less, but were equally satisfied with their jobs. Neither gender was satisfied with promotion opportunities or pay, but both were highly satisfied with their jobs in general--another apparent paradox. The disproportionate number of male respondents raised questions about gender equity in athletics administration.

Administrative Personnel↗
PubMed1988

The development of locomotor coordination: longitudinal change and invariance.

Developmental sequence, relative timing, center of gravity, and phase-plane analyses were used to study a minimum of 15 years of longitudinal, filmed data on the development of hopping in 7 children. The developmental sequences revealed common, qualitative changes in the movement of the children, although each child progressed through the changes at his/her own rate. The timing analyses showed that, in the advanced hop, the tightest limb relationships were found within the hopping leg, then between contralateral limbs of the same girdle, and then between legs and arms. Relative-timing calculations revealed (a) intralimb, timing invariances that were present in first attempts to perform the skill at age 3 and remained for 15 years across all developmental levels; (b) emergent, interlimb timings that gradually became invariant; and (c) intra- and interlimb timing showing gradual development over the 15 years. One invariant, the time between landing and deepest knee flexion, is also invariant in the walk and the run (Shapiro, Zernicke, Gregor, & Diestel, 1981). Phase plane analyses indicated that the timing of peak and zero velocities may be the coordinative constant accounting for a relative timing invariance between the two legs. Position of the body's center of gravity may explain the invariant relative time between landing and deepest knee flexion, or the explanation could lie in the "equation of constraint" regulating joint equilibrium points. The data suggest that modeling the developing hop as the evolving interaction of four vibratory systems would be promising.

Journal Article↗