Peter Maulder - Academia.edu (original) (raw)

Papers by Peter Maulder

Research paper thumbnail of THE EFFECTS OF RESISTED SLED LOADING ON SPRINT START KINEMATICS

Research paper thumbnail of Dominant limb asymmetry greater than 10% during unanticipated agility performance is associated with prospective injury occurrence

Research paper thumbnail of The Effect of Biological Movement Variability on the Performance of the Golf Swing in High- and Low-Handicapped Players

Research Quarterly for Exercise and Sport, 2009

The purpose of this study was to examine the role of neuromotor noise on golf swing performance i... more The purpose of this study was to examine the role of neuromotor noise on golf swing performance in high- and low-handicap players. Selected two-dimensional kinematic measures of 20 male golfers (n=10 per high- or low-handicap group) performing 10 golf swings with a 5-iron club was obtained through video analysis. Neuromotor noise was calculated by deducting the standard error of the measurement from the coefficient of variation obtained from intra-individual analysis. Statistical methods included linear regression analysis and one-way analysis of variance using SPSS. Absolute invariance in the key technical positions (e.g., at the top of the backswing) of the golf swing appears to be a more favorable technique for skilled performance.

Research paper thumbnail of Is injury occurrence associated with joint coupling variability during unanticipated movement tasks performed by netballers?

Research paper thumbnail of Does successful unanticipated turning ability lead to successful unanticipated straight sprint ability in netballers?

Research paper thumbnail of Are Anthropometric, Flexibility, Muscular Strength, and Endurance Variables Related To Clubhead Velocity in Low- And High-Handicap Golfers?

Journal of Strength and Conditioning Research, 2009

Keogh, JWL, Marnewick, MC, Maulder, PS, Nortje, JP, Hume, PA, and Bradshaw, EJ. Are anthropometri... more Keogh, JWL, Marnewick, MC, Maulder, PS, Nortje, JP, Hume, PA, and Bradshaw, EJ. Are anthropometric, flexibility and muscular strength and endurance variables related to clubhead velocity in low-and high-handicap golfers? J Strength Cond Res 23(6): 1841-1850, 2009-The present study assessed the anthropometric profile (International Society for the Advancement of Kinanthropometry protocol), flexibility, muscular strength, and endurance of 20 male golfers. These data were collected in order to determine: a) the relationship between these kinanthropometric measures and clubhead velocity; and b) if these measures could distinguish low-handicap (LHG) and high-handicap (HHG) golfers. Ten LHG (handicap of 0.3 6 0.5) and 10 HHG (handicap of 20.3 6 2.4) performed 10 swings for maximum velocity and accuracy with their own 5-iron golf club at a wall-mounted target. LHG hit the target significantly more (115%) and had a 12% faster clubhead velocity than HHG (p , 0.01). The LHG also had significantly (28%) greater golf swingspecific cable woodchop (GSCWC) strength (p , 0.01) and tendencies for greater (30%) bench press strength and longer (5%) upper am and total arm (4%) length and less (24%) right hip internal rotation than HHG (0.01 , p , 0.05). GSCWC strength was significantly correlated to clubhead velocity (p , 0.01), with bench press and hack squat strength as well as upper arm and total arm length also approaching significance (0.01 , p , 0.05). Golfers with high GSCWC strength and perhaps greater bench press strength and longer arms may therefore be at a competitive advantage, as these characteristics allow the production of greater clubhead velocity and resulting ball displacement. Such results have implications for golf talent identification programs and for the prescription and monitoring of golf conditioning programs. While golf conditioning programs may have many aims, specific trunk rotation exercises need to be included if increased clubhead velocity is the goal. Muscular hypertrophy development may not need to be emphasized as it could reduce golf performance by limiting range of motion and/ or increasing moment of inertia.

Research paper thumbnail of Jump kinetic determinants of sprint acceleration performance from starting blocks in male sprinters

Journal of sports science & medicine, 2006

The purpose of this research was to identify the jump kinetic determinants of sprint acceleration... more The purpose of this research was to identify the jump kinetic determinants of sprint acceleration performance from a block start. Ten male (mean ± SD: age 20 ± 3 years; height 1.82 ± 0.06 m; weight 76.7 ± 7.9 kg; 100 m personal best: 10.87 + 0.36 s {10.37 - 11.42}) track sprinters at a national and regional competitive level performed 10 m sprints from a block start. Anthropometric dimensions along with squat jump (SJ), countermovement jump (CMJ), continuous straight legged jump (SLJ), single leg hop for distance, and single leg triple hop for distance measures of power were also tested. Stepwise multiple regression analysis identified CMJ average power (W/kg) as a predictor of 10 m sprint performance from a block start (r = 0.79, r(2) = 0.63, p<0.01, SEE = 0.04 (s), %SEE = 2.0). Pearson correlation analysis revealed CMJ force and power (r = -0.70 to -0.79; p = 0.011 - 0.035) and SJ power (r = -0.72 to -0.73; p = 0.026 - 0.028) generating capabilities to be strongly related to sp...

Research paper thumbnail of Effectiveness of Foot Orthoses for Treatment and Prevention of Lower Limb Injuries

Research paper thumbnail of Biological movement variability during the sprint start: Performance enhancement or hindrance?

Sports Biomechanics, 2007

In the current study, we quantified biological movement variability on the start and early accele... more In the current study, we quantified biological movement variability on the start and early acceleration phase of sprinting. Ten male athletes aged 17-23 years (100-m personal best: 10.87^0.36 s) performed four 10-m sprints. Two 250-Hz cameras recorded the sagittal plane action to obtain the twodimensional kinematics of the block start and initial strides from subsequent manually digitized APAS motion analysis. Infra-red timing lights (80 Hz) were used to measure the 10-m sprinting times. The coefficient of variation (CV%) calculation was adjusted to separate biological movement variability (BCV%) from estimates of variability induced by technological error (SEM%) for each individual sprinter and measure. Pearson's product -moment correlation and linear regression analysis were used to establish relationships between measures of BCV% and 10-m sprint start performance (best 10-m time) or 10-m sprint start performance consistency (10-m time BCV%) using SPSS version 12.0. Measurement error markedly inflated traditional measures of movement variability (CV%) by up to 72%. Variability in task outcome measures was considerably lower than that observed in joint rotation velocities. Consistent generation of high horizontal velocity out of the blocks led to more stable and faster starting strides.

Research paper thumbnail of Horizontal and vertical jump assessment: reliability, symmetry, discriminative and predictive ability

Physical Therapy in Sport, 2005

Objectives: The purpose of this study was to: (1) establish the reliability of a new unilateral c... more Objectives: The purpose of this study was to: (1) establish the reliability of a new unilateral concentric only horizontal jump assessment (HSJ) then compare the reliability of this test to other types of unilateral vertical and horizontal jumps; (2) compare the tests to whether they differ in their ability to determine limb asymmetries; and (3) investigate the relationship between these jumps and sprint running.

Research paper thumbnail of Joint coupling variability can likely indicate lower extremity injury occurrence

Research paper thumbnail of THE EFFECTS OF RESISTED SLED LOADING ON SPRINT START KINEMATICS

Research paper thumbnail of Dominant limb asymmetry greater than 10% during unanticipated agility performance is associated with prospective injury occurrence

Research paper thumbnail of The Effect of Biological Movement Variability on the Performance of the Golf Swing in High- and Low-Handicapped Players

Research Quarterly for Exercise and Sport, 2009

The purpose of this study was to examine the role of neuromotor noise on golf swing performance i... more The purpose of this study was to examine the role of neuromotor noise on golf swing performance in high- and low-handicap players. Selected two-dimensional kinematic measures of 20 male golfers (n=10 per high- or low-handicap group) performing 10 golf swings with a 5-iron club was obtained through video analysis. Neuromotor noise was calculated by deducting the standard error of the measurement from the coefficient of variation obtained from intra-individual analysis. Statistical methods included linear regression analysis and one-way analysis of variance using SPSS. Absolute invariance in the key technical positions (e.g., at the top of the backswing) of the golf swing appears to be a more favorable technique for skilled performance.

Research paper thumbnail of Is injury occurrence associated with joint coupling variability during unanticipated movement tasks performed by netballers?

Research paper thumbnail of Does successful unanticipated turning ability lead to successful unanticipated straight sprint ability in netballers?

Research paper thumbnail of Are Anthropometric, Flexibility, Muscular Strength, and Endurance Variables Related To Clubhead Velocity in Low- And High-Handicap Golfers?

Journal of Strength and Conditioning Research, 2009

Keogh, JWL, Marnewick, MC, Maulder, PS, Nortje, JP, Hume, PA, and Bradshaw, EJ. Are anthropometri... more Keogh, JWL, Marnewick, MC, Maulder, PS, Nortje, JP, Hume, PA, and Bradshaw, EJ. Are anthropometric, flexibility and muscular strength and endurance variables related to clubhead velocity in low-and high-handicap golfers? J Strength Cond Res 23(6): 1841-1850, 2009-The present study assessed the anthropometric profile (International Society for the Advancement of Kinanthropometry protocol), flexibility, muscular strength, and endurance of 20 male golfers. These data were collected in order to determine: a) the relationship between these kinanthropometric measures and clubhead velocity; and b) if these measures could distinguish low-handicap (LHG) and high-handicap (HHG) golfers. Ten LHG (handicap of 0.3 6 0.5) and 10 HHG (handicap of 20.3 6 2.4) performed 10 swings for maximum velocity and accuracy with their own 5-iron golf club at a wall-mounted target. LHG hit the target significantly more (115%) and had a 12% faster clubhead velocity than HHG (p , 0.01). The LHG also had significantly (28%) greater golf swingspecific cable woodchop (GSCWC) strength (p , 0.01) and tendencies for greater (30%) bench press strength and longer (5%) upper am and total arm (4%) length and less (24%) right hip internal rotation than HHG (0.01 , p , 0.05). GSCWC strength was significantly correlated to clubhead velocity (p , 0.01), with bench press and hack squat strength as well as upper arm and total arm length also approaching significance (0.01 , p , 0.05). Golfers with high GSCWC strength and perhaps greater bench press strength and longer arms may therefore be at a competitive advantage, as these characteristics allow the production of greater clubhead velocity and resulting ball displacement. Such results have implications for golf talent identification programs and for the prescription and monitoring of golf conditioning programs. While golf conditioning programs may have many aims, specific trunk rotation exercises need to be included if increased clubhead velocity is the goal. Muscular hypertrophy development may not need to be emphasized as it could reduce golf performance by limiting range of motion and/ or increasing moment of inertia.

Research paper thumbnail of Jump kinetic determinants of sprint acceleration performance from starting blocks in male sprinters

Journal of sports science & medicine, 2006

The purpose of this research was to identify the jump kinetic determinants of sprint acceleration... more The purpose of this research was to identify the jump kinetic determinants of sprint acceleration performance from a block start. Ten male (mean ± SD: age 20 ± 3 years; height 1.82 ± 0.06 m; weight 76.7 ± 7.9 kg; 100 m personal best: 10.87 + 0.36 s {10.37 - 11.42}) track sprinters at a national and regional competitive level performed 10 m sprints from a block start. Anthropometric dimensions along with squat jump (SJ), countermovement jump (CMJ), continuous straight legged jump (SLJ), single leg hop for distance, and single leg triple hop for distance measures of power were also tested. Stepwise multiple regression analysis identified CMJ average power (W/kg) as a predictor of 10 m sprint performance from a block start (r = 0.79, r(2) = 0.63, p<0.01, SEE = 0.04 (s), %SEE = 2.0). Pearson correlation analysis revealed CMJ force and power (r = -0.70 to -0.79; p = 0.011 - 0.035) and SJ power (r = -0.72 to -0.73; p = 0.026 - 0.028) generating capabilities to be strongly related to sp...

Research paper thumbnail of Effectiveness of Foot Orthoses for Treatment and Prevention of Lower Limb Injuries

Research paper thumbnail of Biological movement variability during the sprint start: Performance enhancement or hindrance?

Sports Biomechanics, 2007

In the current study, we quantified biological movement variability on the start and early accele... more In the current study, we quantified biological movement variability on the start and early acceleration phase of sprinting. Ten male athletes aged 17-23 years (100-m personal best: 10.87^0.36 s) performed four 10-m sprints. Two 250-Hz cameras recorded the sagittal plane action to obtain the twodimensional kinematics of the block start and initial strides from subsequent manually digitized APAS motion analysis. Infra-red timing lights (80 Hz) were used to measure the 10-m sprinting times. The coefficient of variation (CV%) calculation was adjusted to separate biological movement variability (BCV%) from estimates of variability induced by technological error (SEM%) for each individual sprinter and measure. Pearson's product -moment correlation and linear regression analysis were used to establish relationships between measures of BCV% and 10-m sprint start performance (best 10-m time) or 10-m sprint start performance consistency (10-m time BCV%) using SPSS version 12.0. Measurement error markedly inflated traditional measures of movement variability (CV%) by up to 72%. Variability in task outcome measures was considerably lower than that observed in joint rotation velocities. Consistent generation of high horizontal velocity out of the blocks led to more stable and faster starting strides.

Research paper thumbnail of Horizontal and vertical jump assessment: reliability, symmetry, discriminative and predictive ability

Physical Therapy in Sport, 2005

Objectives: The purpose of this study was to: (1) establish the reliability of a new unilateral c... more Objectives: The purpose of this study was to: (1) establish the reliability of a new unilateral concentric only horizontal jump assessment (HSJ) then compare the reliability of this test to other types of unilateral vertical and horizontal jumps; (2) compare the tests to whether they differ in their ability to determine limb asymmetries; and (3) investigate the relationship between these jumps and sprint running.

Research paper thumbnail of Joint coupling variability can likely indicate lower extremity injury occurrence