The identification of fall history using maximal and rapid isometric torque characteristics of the hip extensors in healthy, recreationally active elderly females: a preliminary investigation

Palmer, Ty B.; Thiele, Ryan M.; Williams, Katherine B.; Adams, Bailey M.; Akehi, Kazuma; Smith, Douglas B.; Thompson, Brennan J.

doi:10.1007/s40520-014-0305-0

Cited by 25 publications

(21 citation statements)

References 39 publications

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“…The greater exercise-induced depression of force capacities for the eccentric actions across a 30-min recovery period shown in the present study is suggestive of a relatively extended period of time whereby physical activities may be compromised in terms of both optimal performance as well as potential for injury as a result of low eccentric force production abilities. This finding appears to be particularly useful in the context of this study for the reason that these depressed strength responses were demonstrated for the eccentric actions specifically for the hamstrings muscles, which is a key contributing muscle group toward injury risk profiling (specifically to the functional eccentric hamstrings to concentric quadriceps ratio) (Jenkins et al 2013), as well as being a sensitive muscle group for identifying/ discriminating both athletic (Jenkins et al 2013;Thompson et al 2013) and clinical-based functional status (Bento et al 2010;Palmer et al 2014).…”

Section: Discussionmentioning

confidence: 85%

Effects of age and muscle action type on acute strength and power recovery following fatigue of the leg flexors

Thompson

Conchola

Stock

2015

AGE

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Short-term strength and power recovery patterns following fatigue have received little research attention, particularly as they pertain to age-specific responses, and the leg flexors (i.e., hamstrings) muscle group. Thus, research is warranted addressing these issues because both age-related alterations in the neuromuscular system and mode of muscle action (e.g., eccentric, concentric, isometric) may differentially influence recovery responses from fatigue. The aim of this study was to investigate the strength and power recovery responses for eccentric, concentric, and isometric muscle actions of the leg flexors in young and older men following an isometric, intermittent fatigue-inducing protocol. Nineteen young (age = 25 ± 3 years) and nineteen older (71 ± 4) men performed maximal voluntary contractions (MVCs) for eccentric, concentric, and isometric muscle actions followed by a fatigue protocol of intermittent (0.6 duty cycle) isometric contractions of the leg flexors at 60% of isometric MVC. MVCs of each muscle action were performed at 0, 7, 15, and 30 min following fatigue. Peak torque (PT) and mean power values were calculated from the MVCs and the eccentric/concentric ratio (ECR) was derived. For PT and mean power, young men showed incomplete recovery at all time phases, whereas the older men had recovered by 7 min. Eccentric and isometric muscle actions showed incomplete recovery at all time phases, but concentric recovered by 7 min, independent of age. The ECR was depressed for up to 30 min following fatigue. More rapid and pronounced recovery in older men and concentric contractions may be related to physiological differences specific to aging and muscle action motor unit patterns. Individuals and clinicians may use these time course responses as a guide for recovery following activity-induced fatigue.

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Section: Discussionmentioning

confidence: 85%

Effects of age and muscle action type on acute strength and power recovery following fatigue of the leg flexors

Thompson

Conchola

Stock

2015

AGE

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“…RTD (Nm·s −1 ) was calculated from the linear slope of the torque – time curve at 0–50 ms (RTD50), similar to the procedures of previous studies [29,30]. This time interval was selected because it has been previously shown that the RTD within the first 50 ms may provide unique physiological information when compared to PT [8,30] or RTD at 200 ms [31,32]. The onset of contraction was determined as the point when the torque signal reached 4 Nm [29].…”

Section: Methodsmentioning

confidence: 99%

Dietary protein intake is associated with maximal and explosive strength of the leg flexors in young and older blue collar workers

et al. 2015

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The aim of this study was to investigate the association between dietary PRO intake and maximal and rapid strength of the leg flexors in blue collar (BC) working men. Twenty-four young (age=23.2±2.1 yrs), and nineteen older aged (age=52.8±5.2 yrs) men employed in BC occupations completed a three day dietary record and isometric strength testing of the leg flexors. Food logs were analyzed for total protein (TPRO) and essential amino acid (EAA) intake. Rapid and maximal strength capacities were examined from the rate of torque development at 50ms (RTD50) and peak torque (PT) of the torque-time curves, respectively. Pearson correlations and partial correlations were used to examine the relationships between TPRO and EAA intake on strength variables. PT was positively correlated to TPRO and EAA intake in the young (r=0.439 and 0.431;P<0.05) and older aged (r=0.636 and 0.605; P<0.01) men and RTD50 was correlated to TPRO and EAA intake in the young (r=0.512 and 0.310; P=0.01) and older aged (r=0.662 and 0.665; P<0.01) men, respectively. There were no relationships (P>0.05) between TPRO and strength variables when controlling for EAA intake. TPRO intake explained 20–44% of the variance in rapid and maximal strength for both age groups. EAA intake was largely responsible for the positive relationship between PRO intake and strength. Across young and older aged blue collar working male populations, protein consumption was associated with both maximal and explosive strength capacities of the leg flexors muscle group.

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“…Thus, the purpose of the present study was to examine the relationships between maximal and rapid strength and functional balance performance in career firefighters. Based upon previous literature 9 – 11 , 20 , we hypothesized that leg flexion rapid strength at early time intervals (i.e. 50 ms) would be the variable most strongly associated with functional balance performance.…”

Section: Introductionmentioning

confidence: 99%

“…However, the time needed to react and prevent a fall is shorter than the time required to reach maximal strength; therefore, the ability to generate force/torque rapidly may be critical in preventing STF-related injuries 10 – 12 . Furthermore, rapid torque production at early (i.e., 50 ms), but not late (i.e., 200 ms), time intervals have been suggested to be a better predictor of falls in the elderly 11 . However, these observations may also be muscle group specific as previous authors 10 have demonstrated that the leg flexors are more predictive of previous falls history than the leg extensors.…”

Section: Introductionmentioning

confidence: 99%

Relationships Between Neuromuscular Function and Functional Balance Performance in Firefighters

Mota

Barnette

Gerstner

et al. 2018

Sci Rep

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The purpose of the present study was to examine the relationships between neuromuscular function and functional balance performance in firefighters. Fifty career firefighters (35.1 ± 7.5 yr) performed isometric leg extension and flexion muscle actions to examine peak torque (PT), and absolute (aTQ) and normalized (nTQ; %PT) rapid torque variables at 50, 100, 150, and 200 ms. A performance index (PI) was determined from the functional balance assessment completion time. Partial correlations were used to examine the relationship between the PI and the maximal and rapid TQ variables for each muscle and the composite value, while controlling for demographic data related to the PI. Multiple regression analyses examined the relative contributions of the maximal and rapid aTQ variables, and demographic data on the PI. After controlling for age and %BF, the majority of the later aTQ and nTQ variables (100–200 ms) and PT were associated with the PI (r = −0.501–−0.315). Age, %BF, and aTQ100 explained 42–50% of the variance in the PI. Lower rapid strength, increased age, and poorer body composition were related to worse performance during the functional balance assessment. Strategies to improve rapid strength and %BF, especially in aging firefighters may impact dynamic balance abilities in firefighters.

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The identification of fall history using maximal and rapid isometric torque characteristics of the hip extensors in healthy, recreationally active elderly females: a preliminary investigation

Cited by 25 publications

References 39 publications

Effects of age and muscle action type on acute strength and power recovery following fatigue of the leg flexors

Effects of age and muscle action type on acute strength and power recovery following fatigue of the leg flexors

Dietary protein intake is associated with maximal and explosive strength of the leg flexors in young and older blue collar workers

Relationships Between Neuromuscular Function and Functional Balance Performance in Firefighters

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