The Performance of Female Young Adults in Perception of Efforts of Varied Nature and Magnitudes

1993 ◽  
Vol 37 (10) ◽  
pp. 793-797
Author(s):  
Shrawan Kumar ◽  
Maureen Simmonds ◽  
David Lechelt
Keyword(s):  
Young Adults ◽  
Statistical Analysis ◽  
Young Adult ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Test Analysis ◽  
Hand Grip ◽  
Adult Females ◽  
Significant Difference ◽  
Entire Experiment

Ten normal young adult females performed maximal and graded exertions of the stoop lift, hand grip, and finger pinch. The levels of graded exertion required were 80%, 60%, 40% and 20% of maximal voluntary contraction (MVC). The sequence of all conditions were fully randomized. Each of the randomized conditions was tried three times in succession. The entire experiment was carried out on four different days at the same time of the day on Monday, Wednesday, Friday of one week and Friday of the next week. The data obtained were subjected to descriptive and statistical analysis with t-test, analysis of variance, and correlation and regression. There were significant differences in the efforts produced in three different activities (p<0.01). The levels of exertion from 20% to 80% were significantly different from each other (p<0.01). However, there were no significant differences between the three trials of any given condition and the exertions produced on four different days. The 80% and 60% of exertions were overestimated and 20% was underestimated compared to the objective values based on MVC (p<0.01). At 40% effort there was no significant difference between the objective level of exertion and subjectively gauged and produced effort. The reliability of perception among the female subjects was similar for finger pinch, hand grip, and stoop lift activities.

scholarly journals Exercise tolerance during muscle contractions below and above the critical torque in different muscle groups

2018 ◽  
Vol 43 (2) ◽  
pp. 174-179 ◽  
Author(s):  
Leonardo Henrique Perinotto Abdalla ◽  
Benedito Sérgio Denadai ◽  
Natália Menezes Bassan ◽  
Camila Coelho Greco
Keyword(s):  
Exercise Intensity ◽  
Maximal Voluntary Contraction ◽  
Exercise Tolerance ◽  
Voluntary Contraction ◽  
Knee Extensors ◽  
Isometric Contractions ◽  
Plantar Flexors ◽  
Significant Difference ◽  
Muscle Groups

The objective of this study was to test the hypotheses that end-test torque (ET) (expressed as % maximal voluntary contraction; MVC) is higher for plantar flexors (PF) than knee extensors (KE) muscles, whereas impulse above ET (IET) is higher for KE than PF. Thus, we expected that exercise tolerance would be longer for KE than PF only during the exercise performed above ET. After the determination of MVC, 40 men performed two 5-min all-out tests to determine ET and IET. Eleven participants performed a further 4 intermittent isometric tests, to exhaustion, at ET + 5% and ET – 5%, and 1 test for KE at the exercise intensity (%MVC) corresponding to ET + 5% of PF. The IET (7243.2 ± 1942.9 vs. 3357.4 ± 1132.3 N·m·s) and ET (84.4 ± 24.8 vs. 73.9 ± 19.5 N·m) were significantly lower in PF compared with KE. The exercise tolerance was significantly longer for PF (300.7 ± 156.7 s) than KE (156.7 ± 104.3 s) at similar %MVC (∼60%), and significantly shorter for PF (300.7 ± 156.7 s) than KE (697.0 ± 243.7 s) at ET + 5% condition. However, no significant difference was observed for ET – 5% condition (KE = 1030.2 ± 495.4 s vs. PF = 1028.3 ± 514.4 s). Thus, the limit of tolerance during submaximal isometric contractions is influenced by absolute MVC only during exercise performed above ET, which seems to be explained by differences on both ET (expressed as %MVC) and IET values.

The Influence of Intermittent Fatigue Exercise on Early and Late Phases of Relaxation From Maximal Voluntary Contraction

1997 ◽  
Vol 22 (6) ◽  
pp. 573-584 ◽  
Author(s):  
Anna Jaskólska ◽  
Artur Jaskólski
Keyword(s):  
Relaxation Time ◽  
Relaxation Rate ◽  
Maximal Voluntary Contraction ◽  
Early Phase ◽  
Intermittent Exercise ◽  
Young Male ◽  
Voluntary Contraction ◽  
Hand Grip ◽  
Before And After ◽  
Late Relaxation Time

Twenty-two young male subjects were tested to estimate the behavior of the early and late phases of relaxation from a 3-s maximal voluntary contraction (MVC) under the influence of fatigue. Less demanding and more demanding protocols of intermittent hand grip exercise were used to fatigue muscle. Before and after fatigue, the early and late relaxation time, maximal relaxation rate, and half-relaxation time were measured. The results showed that during voluntary movement (a) the early phase of relaxation was independent of the mode of intermittent exercise and did not change significantly after fatigue; (b) the late relaxation time and absolute maximal relaxation rate were slower after both protocols, with the changes more pronounced following the more demanding protocol; and (c) the half-relaxation time and relative maximal relaxation rate were changed only in the more demanding protocol. It is concluded that unlike the relaxation following electrical stimulation of isolated muscle, the early phase of relaxation from voluntary contraction appears to be the most resistant to the type of intermittent fatiguing exercise used in the present study, whereas the late relaxation time was the most sensitive to this type of fatigue. Key words: hand grip exercise, late relaxation time, early relaxation time, half-relaxation time

Effect of Administration Method on Near Point of Convergence Scores in a Healthy, Active, Young Adult Population

2018 ◽  
Vol 23 (4) ◽  
pp. 156-161
Author(s):  
Jacqueline Phillips ◽  
Kelly Cheever ◽  
Jamie McKeon ◽  
Ryan Tierney
Keyword(s):  
Young Adults ◽  
Young Adult ◽  
Assessment Tool ◽  
Adult Population ◽  
Significant Difference ◽  
Young Adult Population ◽  
Administration Method ◽  
Administration Methods

Near point of convergence (NPC) is an emerging concussion assessment tool and researchers have reported NPC scores using different administration methods which may influence assessment interpretation. The purpose of this study is to investigate the effect of different administrative methods on NPC scores in healthy, active young adults. NPC was measured using two different accommodative rulers and a fingertip, with three different placements. No significant difference in NPC score was observed between rulers. Significant differences were observed between ruler placements. Furthermore, fingertip use was significantly different compared to all ruler placements.

Maintenance of Uncued Isometric Contractions by Blind and Sighted

1979 ◽  
Vol 49 (2) ◽  
pp. 475-479
Author(s):  
Claudia G. Emes
Keyword(s):  
Maximum Voluntary Contraction ◽  
Voluntary Contraction ◽  
Isometric Contractions ◽  
Hand Grip ◽  
Significant Difference ◽  
Static Contractions

A comparison of 10 blind and 10 sighted subjects to a proprioceptive task was examined by analysis of response to maintenance of uncued static contractions. In attempting to sustain hand-grip tensions at specified percentages of maximum voluntary contraction, blind and sighted groups showed no significant difference in performance.

scholarly journals Scapular Retraction Under Adduction Load: an Alternative to Overhead Exercises to Activate Infraspinatus, Upper and Lower Trapezius in Subjects With and Without Shoulder Pain

2021 ◽  
Author(s):  
Jefferson James dos Santos ◽  
Rebeca Orozco Nagy ◽  
Matheus Almeida Souza ◽  
Leonardo Intelangelo ◽  
Michelle Almeida Barbosa ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Shoulder Pain ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Load Cell ◽  
Subacromial Space ◽  
Condition Effect ◽  
Lower Trapezius

Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. Electromyography of infraspinatus (IS), upper (UT) and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided in 2 groups: with (SP, n=26) and without shoulder pain (nSP, n=16). The adduction loads of 20, 30, 40 and 50% of the maximal voluntary contraction were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% (p=0.004); LT showed higher values on 40% and 50% (p=0.001; 0.006). Higher values for IS were noted at 40% (vs 20%; p=0.04), and at 50% (vs. 20%; p=0.001, vs. 30%, p=0.001; vs. 40%; p=0.001). UT:LT showed lower values at 50% (vs. 20%; p=0.001, and vs. 30%; p=0.016). Scapular retraction with adduction loads at 40-50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation, without increasing UT excitation.

scholarly journals Analisis Kondisi Fisik Atlet Club Bola Voli Putri Di Kota Bengkulu Tahun 2020

2020 ◽  
Vol 1 (1) ◽  
pp. 31-36
Author(s):  
Pipin Silpina ◽  
Tono Sugihartono ◽  
Ari Sutisyana
Keyword(s):  
Statistical Analysis ◽  
T Test ◽  
Test Analysis ◽  
Significant Difference ◽  
Calculation Results ◽  
Quasi Experimental ◽  
Long Jump

This study aims to determine the differences in pliometric training of single leg speed hops and double leg speed hops on the ability of squat style long jump in SMA Negeri 08 Bengkulu Utara. The type of research used in this study was quasi-experimental. The sample in this study was students at SMA Negeri 08 Bengkulu Utara which numbered 50 students. The statistical analysis used is the t test. The results of the t-test analysis of the comparison calculation between the final results of the two groups turned out to have a significant difference. The calculation results state that tcount of 3.02 is greater than ttable 2.069 with the level of ? = 0.05, so it can be concluded that there are differences in the influence of the single leg speed hop pliometric exercise and double leg speed hop hops on the ability of squat style long jump.

scholarly journals Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain

2021 ◽  
Vol 18 (17) ◽  
pp. 9251
Author(s):  
Jefferson James dos Santos ◽  
Rebeca Orozco Nagy ◽  
Matheus Almeida Souza ◽  
Leonardo Intelangelo ◽  
Michelle Almeida Barbosa ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Shoulder Pain ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Load Cell ◽  
Subacromial Space ◽  
Painful Shoulder ◽  
Upper Trapezius ◽  
Condition Effect ◽  
Lower Trapezius

Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. The present study aimed to assess the excitation levels of infraspinatus, upper trapezius, and lower trapezius muscles during a scapular retraction exercise under progressive adduction loads in subjects with and without painful shoulder. Electromyography of infraspinatus (IS), upper trapezius (UT), and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided into two groups: with (SP, n = 26) and without shoulder pain (nSP, n = 16). The adduction loads of 20%, 30%, 40%, and 50% of the maximal voluntary contraction (MVC) were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% of MVC (p = 0.004); LT showed higher values on 40% and 50% of MVC (p = 0.001; 0.006). Higher values for IS were noted at 40% of MVC (vs. 20% of MVC; p = 0.04) and at 50% of MVC (vs. 20% of MVC; p = 0.001, vs. 30% of MVC, p = 0.001; vs. 40% of MVC; p = 0.001). UT:LT showed lower values at 50% of MVC (vs. 20% of MVC; p = 0.001 and vs. 30% of MVC; p = 0.016). Scapular retraction with adduction loads at 40–50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation without increasing UT excitation.

Evolution of the prevalence of pre-residency peer-reviewed publications among incoming junior residents

2020 ◽  
pp. postgradmedj-2020-139223
Author(s):  
Shearwood McClelland III ◽  
Blair Murphy ◽  
Jerry J Jaboin ◽  
Richard C Zellars
Keyword(s):  
Statistical Analysis ◽  
Radiation Oncology ◽  
Private Practice ◽  
Test Analysis ◽  
Exact Test ◽  
The Past ◽  
Significant Difference ◽  
Number Of Publications ◽  
Residency Application ◽  
Junior Residents

Pre-residency peer-reviewed publications (PRP) have been associated with subsequent resident choice of academic versus private practice career. The evolution of PRP prevalence among radiation oncology resident classes has yet to be examined. A list of radiation oncology residents from the graduating classes of 2016 and 2022 were obtained, and PRP was compiled as the number of publications a resident had listed in PubMed as of the end of the calendar year of residency application. Statistical analysis was conducted using Fisher’s exact test. Analysis of 163 residents from the 2016 class compared with 195 from the 2022 class revealed that the proportion of residents with zero PRP decreased from 46.6% to 23.6% between the 2016 to 2022 classes (p<0.0001), while that of residents with one PRP increased from 17.8% to 19.0% (p>0.05) and with at least two PRP increased from 35.6% to 57.4% (p<0.0001). Residents with a PhD were more likely to have at least two PRP in each class (p<0.0001). As with the class of 2016, there remained no significant difference in PRP by gender for the class of 2022. Over the past six years, PRP has become more prevalent among incoming radiation oncology residents. Residents in the class of 2016 were 180% less likely than the class of 2022 to have at least one PRP, and 60% less likely to have at least two PRP. These findings are indicative of the increasing pressure on medical students to enter residency with a publication background.

Language Familiarity in Magnitude-Estimation Scaling of Loudness by Young Adults

1995 ◽  
Vol 80 (2) ◽  
pp. 419-423 ◽  
Author(s):  
Donald Fucci ◽  
Ramesh Bettagere ◽  
Maria Diana Gonzales ◽  
Mary E. Reynolds ◽  
Linda Petrosino
Keyword(s):  
Young Adults ◽  
Statistical Analysis ◽  
Magnitude Estimation ◽  
Study Group ◽  
Effective Measure ◽  
English Sentence ◽  
Significant Difference ◽  
Language Familiarity ◽  
Group 2 ◽  
Group 1

The purpose was to examine the effect of language familiarity on magnitude-estimation scaling of loudness by young adults Two groups of subjects participated in this study. Group 1 of 20 subjects ( M age = 23.95 yr.) were familiar with English and not familiar with Hindi. Group 2 of 20 subjects ( M age = 24.30 yr.) were familiar with English as well as Hindi. Two separate magnitude-estimation scaling tasks were performed. On the first scaling task, an English sentence was used as the stimulus, and on the second scaling task, a Hindi semence was used as the stimulus. Statistical analysis showed that there was no significant difference between the two groups in loudness judgments of the English and Hindi sentences. Subjects scaled the loudness of an unfamiliar language in the same manner as they scaled the loudness of a familiar language. The findings suggest that magnitude-estimation scaling is an effective measure of loudness whether the language being listened to is familiar to the listener.

scholarly journals The Effect of Static Stretching on Maximal Voluntary Contraction and Force-Time Curve Characteristics

2006 ◽  
Vol 15 (3) ◽  
pp. 185-194 ◽  
Author(s):  
Christos Papadopoulos ◽  
Vasilios I. Kalapotharakos ◽  
Georgios Noussios ◽  
Konstantinos Meliggas ◽  
Evangelia Gantiraga
Keyword(s):  
Maximal Voluntary Contraction ◽  
Isometric Force ◽  
Rectus Femoris ◽  
Biceps Femoris ◽  
Voluntary Contraction ◽  
Emg Activity ◽  
Static Stretching ◽  
Time Curve ◽  
Significant Difference ◽  
Force Time

Objective:To examine the effect of static stretching on maximal voluntary contraction (MVC) and isometric force-time curve characteristics of leg extensor muscles and EMG activity of rectus femoris (RF), biceps femoris (BF), and gastrocnemius (GA).Design:A within subjects experimental design.Participants:Ten healthy students were tested after a jogging and a jogging/stretch protocol.Intervention:The stretching protocol involved a 10 min jog and seven static stretching exercises.Main Outcomes:Measurements included MVC, time achieved to MVC (TMVC), force at 100ms (F100), index of relative force (IRF), index of rate of force development (IRFD), and average integrated EMG activity (AEMG).Results:There were slight but no significant changes in MVC (1%), TMVC(4.8%), F100(7.8%), IRF (1%), and IRFD(3.5%) between measurement. A significant difference (21%;P< 0.05) in AEMG of RF was found.Conclusions:The present study indicated that a moderate volume of static stretching did not alter significantly the MVC and the isometric force-time curve characteristics. Neural inhibition, as it is reflected from AEMG of RF, did not alter MVC and isometric force-time curve characteristics.

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