Physiological Effect on Different Reach Distances: A Case Study for Malaysia Adults

2012 ◽  
pp. 77-93
Author(s):  
S.Z. Dawal ◽  
S.J. Sartika ◽  
H.R. Zadry ◽  
Y. San ◽  
S.N. Makhtar ◽  
...  
Keyword(s):  
Heart Rate ◽  
Back Pain ◽  
Oxygen Uptake ◽  
Muscle Activity ◽  
Physiological Responses ◽  
Physiological Effect ◽  
Repetitive Lifting ◽  
Anterior Deltoid ◽  
Lifting Task

The effects of oxygen uptake, heart rate and muscle activity while performing a repetitive lifting task in normal, maximum and extreme reach distances were investigated in the study. Ten subjects (5 females and 5 males) of age between 22-25 years were involved in the study. The results of oxygen uptake showed an increased of 11% and 39% from normal reach to maximum and extreme reach respectively. As for heart rate the results showed an increased of 8% and 17% from normal reach to maximum and extreme reach respectively. Electromyogram reading of anterior deltoid and upper trapezious muscles showed a tremendous increased of more than 80% while bicep brachii muscles showed an increase of only about 1 % from normal reach. The findings from the study showed an increased in the physiological responses when the work reach distance was increased. And lifting task, posture and load on this study developed back pain. Kesan pengambilan oksigen, kadar degupan jantung dan aktiviti otot ketika melaksanakan kerja mangangkat secara berulang pada kadar normal, maximum dan capaian melampau telah dikaji dalam kajian ini. Sepuluh orang peserta kajian, lima perempuan dan lima lelaki yang berumur antara 22-25 tahun terlibat dalam kajian ini. Keputusan kajian terhadap pengambilan oksigen menunjukkan kadar peningkatan sebanyak 11% dan 39% dari kadar normal untuk mencapai kadar maximum dan capaian melampau. Manakala untuk kadar degupan jantung keputusan menunjukkan peningkatan sebanyak 8% dan 17% dari keadaan normal untuk mencapai kadar maximum dan capaian melampau. Bacaan electromyogram pada anterior deltoid dan otot bahagian atas trapezious menunjukkan peningkatan yang besar iaitu sebanyak 80% manakala otot bicep brachii menunjukkan peningkatan sebanyak 1% sahaja dari keadaan normal. Penemuan dalam kajian ini menunjukkan peningkatan dalam tindak balas psikologikal apabila jarak capaian kerja meningkat. Dan pekerjaan mengangkat, postur dan beban dalam kajian ini mengakibatkan sakit belakang badan

scholarly journals Reproducibility of Physiological and Performance Measures from a Squash-Specific Fitness Test

2009 ◽  
Vol 4 (1) ◽  
pp. 41-53 ◽  
Author(s):  
Michael Wilkinson ◽  
Damon Leedale-Brown ◽  
Edward M. Winter
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Lactate Threshold ◽  
Physiological Responses ◽  
Lactate Concentration ◽  
Maximum Heart Rate ◽  
Fitness Test ◽  
Performance Time ◽  
Volitional Exhaustion ◽  
And Performance

Purpose:We examined the reproducibility of performance and physiological responses on a squash-specific incremental test.Methods:Eight trained squash players habituated to procedures with two prior visits performed an incremental squash test to volitional exhaustion on two occasions 7 days apart. Breath-by-breath oxygen uptake ( Vo2) and heart rate were determined continuously using a portable telemetric system. Blood lactate concentration at the end of 4-min stages was assessed to determine lactate threshold. Once threshold was determined, test speed was increased every minute until volitional exhaustion for assessment of maximal oxygen uptake (Vo2max), maximum heart rate (HRmax), and performance time. Economy was taken as the 60-s mean of Vo2 in the final minute of the fourth stage (below lactate threshold for all participants). Typical error of measurement (TEM) with associated 90% confidence intervals, limits of agreement, paired sample t tests, and least products regression were used to assess the reproducibility of scores.Results:Performance time (TEM 27 s, 4%, 90% CI 19 to 49 s) Vo2max (TEM 2.4 mL·kg−1·min−1, 4.7%, 90% CI 1.7 to 4.3 mL·kg−1·min−1), maximum heart rate (TEM 2 beats·min−1, 1.3%, 90% CI 2 to 4 beats·min−1), and economy (TEM 1.6 mL·kg−1·min−1, 4.1%, 90% CI 1.1 to 2.8 mL·kg−1·min−1) were reproducible.Conclusions:The results suggest that endurance performance and physiological responses to a squash-specific fitness test are reproducible.

Effect of Prior Mental or Physical Fatigue on the Biomechanical Response During a Lifting Task

2016 ◽  
Vol 60 (1) ◽  
pp. 997-998
Author(s):  
Susan E. Kotowski ◽  
Joseph Niehaus ◽  
Alyssa Ofat ◽  
Michael Presnell ◽  
Alena Regelski ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Muscle Activation ◽  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Physical Fatigue ◽  
Repetitive Lifting ◽  
Biomechanical Response ◽  
Activation Data ◽  
Study Participants ◽  
Lifting Task

Repetitive lifting is a requirement in many occupations and often leads to prevalent and costly back injuries. What is unknown is how fatigue, whether mental or physical, occurring before the primary lifting task impacts the biomechanical response during the task. Study participants completed three lifting tasks with prior mental fatigue (Stroop test), prior physical fatigue (running on a treadmill), or no prior fatigue. Electromyography (EMG) was used to measure muscle activity and fatigue, and Borg’s Rating of Perceived Exertion (RPE) was also assessed. Muscle activation data and RPE data indicated that both prior mental and physical fatigue increases muscle activation and perceived exertion.

Comparison of the 45-Second/15-Second Intermittent Running Field Test and the Continuous Treadmill Test

2012 ◽  
Vol 7 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Hervé Assadi ◽  
Romuald Lepers
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Field Test ◽  
Recovery Time ◽  
Physiological Responses ◽  
Lactate Concentration ◽  
Training Session ◽  
Treadmill Test ◽  
Active Recovery ◽  
Intermittent Training

Purposes:To compare the physiological responses and maximal aerobic running velocity (MAV) during an incremental intermittent (45-s run/15-s rest) field test (45-15FIT) vs an incremental continuous treadmill test (TR) and to demonstrate that the MAV obtained during 45-15FIT (MAV45-15) was relevant to elicit a high percentage of maximal oxygen uptake (VO2max) during a 30-s/30-s intermittent training session.Methods:Oxygen uptake (VO2), heart rate (HR), and lactate concentration ([La]) were measured in 20 subjects during 2 maximal incremental tests and four 15-min intermittent tests. The time spent above 90% and 95% VO2max (t90% and t95% VO2max, respectively) was determined.Results:Maximal physiological parameters were similar during the 45-15FIT and TR tests (VO2max 58.6 ± 5.9 mL · kg−1 · min−1 for TR vs 58.5 ± 7.0 mL · kg−1 · min−1 for 45-15FIT; HRmax 200 ± 8 beats/min for TR vs 201 ± 7 beats/min for 45-15FIT). MAV45-15 was significantly (P < .001) greater than MAVTR (17.7 ± 1.1 vs 15.6 ± 1.4 km/h). t90% and t95% VO2max during the 30-s/30-s performed at MAVTR were significantly (P < .01) lower than during the 30-s/30-s performed at MAV45-15. Similar VO2 during intermittent tests performed at MAV45-15 and at MAVTR can be obtained by reducing the recovery time or using active recovery.Conclusions:The results suggested that the 45-15FIT is an accurate field test to determine VO2max and that MAV45-15 can be used during high-intensity intermittent training such as 30-s runs interspersed with 30-s rests (30-s/30-s) to elicit a high percentage of VO2max.

Physiological Responses to Specific Maximal Exercise Tests for Cross-Country Skiing

1993 ◽  
Vol 18 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Phillip B. Watts ◽  
Jon Eric Sulentic ◽  
Kip M. Drobish ◽  
Timothy P. Gibbons ◽  
Victoria S. Newbury ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Blood Lactate ◽  
Maximal Exercise ◽  
Physiological Responses ◽  
Peak Oxygen Uptake ◽  
Open Circuit ◽  
Exercise Tests ◽  
Double Poling ◽  
Cross Country

The present study attempted to quantify differences in peak physiological responses to pole-striding (PS), double poling on roller skis (DP), and diagonal striding on roller skis (DS) during maximal exercise. Six expert cross-country ski racers (3 M, 3 F) with a mean age of 20.2 ± 1.3 yrs served as subjects. Testing was conducted on a motorized ski treadmill with a tracked belt surface. Expired air was analyzed continuously via an automated open-circuit system and averaged each 20 s. Heart rate was monitored via telemetry and arterialized blood was collected within 1 min of test termination and analyzed immediately for lactate. Peak values for heart rate and blood lactate did not differ among techniques. Peak oxygen uptake was higher for PS and DS versus DP whereas no difference was found between PS and DS. The VO2 peak for DP was 77 and 81% of VO2 peak for PS and DS, respectively. It was concluded that despite similar peak heart rate and blood lactate values, DP elicits a lower VO2 peak than DS or PS and that PS responses appear to closely reflect those of DS. Key words: exercise testing, maximum oxygen uptake, roller skiing, specificity of exercise, x-c skiing

The content and load of preseason field-based training in a championship-winning professional rugby league team: A case study

2022 ◽  
pp. 174795412110648
Author(s):  
Matthew Fairbank ◽  
Jamie Highton ◽  
Matthew Daniels ◽  
Craig Twist
Keyword(s):  
Heart Rate ◽  
Global Positioning System ◽  
High Speed ◽  
Physiological Responses ◽  
Skill Training ◽  
Rugby League ◽  
Positioning System ◽  
Global Positioning ◽  
Metabolic Distance

This study reports on the content and periodisation of the preseason field-based training for a professional rugby league team. Thirty professional male rugby league players (26 ± 5 years, 180.9 ± 6.5 cm, 94 ± 9 kg) completed an 8-week preseason. Global positioning system devices and heart rate were used to monitor physical and physiological responses of different field-based training components (speed, conditioning, rugby skill and game-based training). Rugby skill training contributed the most to the total distance covered, conditioning was the greatest contributor to high-speed running (>15 km/h) and game-based training provided the greatest high metabolic distance (>20 W/kg) and overall external load. Game-based training provided the greatest time with heart rate ≥80% estimated maximum. The weekly preseason cycle had lower loads on Monday and Thursday whereas Tuesday and Friday produced the highest loads. The preseason described herein adopted a progressive overload comprising a weekly undulating cycle. This study emphasises how skill and games-based training contributes significantly to the overall load of a professional rugby league team's preseason with more traditional conditioning promoting high-speed running load and high metabolic load.

Physiological Responses of Endurance-Trained Male Wheelchair Athletes to a 10-Kilometer Treadmill Time Trial

2002 ◽  
Vol 19 (4) ◽  
pp. 496-508 ◽  
Author(s):  
Ian G. Campbell ◽  
Clyde Williams ◽  
Henryk K.A. Lakomy
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Respiratory Exchange Ratio ◽  
Physiological Responses ◽  
Time Trial ◽  
Peak Oxygen Uptake ◽  
Moderate Correlation ◽  
Wheelchair Athletes ◽  
Dependent Variables ◽  
The Relationship

The purpose was to examine selected physiological responses of endurance-trained male wheelchair athletes in different Paralympic racing classes (T2, n = 3; T3, n = 8; T4, n = 7) during a 10-km treadmill time trial (TM:10-km). Peak oxygen uptake (V̇O2 peak) was determined, and a TM:10-km was completed on a motorized treadmill. From this, % V̇O2peak utilized and the relationship between V̇O2peak and TM:10-km were established. During the TM:10-km, the following dependent variables were examined: propulsion speed, oxygen uptake, respiratory exchange ratio, and heart rate. The results showed athletes utilize a high % V̇O2peak (78.4 –13.6%) during the TM:10-km. There was a moderate correlation (r = -.57, p < .01) between VO2peak and TM:10-km. No physiological differences were found between the paraplegic racing classes (T3, T4), which suggests that there is some justification in amalgamating these racing classes for endurance events.

scholarly journals Effects of Lifting Height, Twist Angle and Load Mass on Psychophysical Experience, Muscle Activity and Heart Rate during Manual Lifting

2013 ◽  
Vol 10 ◽  
pp. 245-250
Author(s):  
Halim Isa ◽  
Omar Noor Rawaida ◽  
Rahayu K. Seri ◽  
Syafiq M. Muhamad ◽  
Shahrizan O. Mohd ◽  
...  
Keyword(s):  
Heart Rate ◽  
Back Pain ◽  
Muscle Activity ◽  
Surface Electromyography ◽  
Occupational Injuries ◽  
Twist Angle ◽  
Maximum Level ◽  
Heart Rate Monitor ◽  
Manual Lifting ◽  
Load Mass

In industry, manual lifting still a prevalent choice even though mechanized and automated equipment are provided. Mismatch between workers' capability and lifting height, twist angle, and load mass in manual lifting can contribute to occupational injuries such as back pain. The purpose of this study is to investigate the effects of lifting height, twist angle, and load mass on psychophysical experience, muscle activity, and heart rate while performing manual lifting activities. Subjective method associated with Likert Scale was applied to assess the psychophysical experience. Meanwhile, surface Electromyography and heart rate monitor were utilized to measure the muscle activity and heart rate respectively. Main findings of this study show that the rating of psychophysical experience, muscle activity, and heart rate increased when the lifting height and load mass increased. This study concluded that the psychophysical experience and muscle activity were affected when the lifting height, twist angle, and load mass were set at maximum level.

scholarly journals The Effect of Climbing Ability and Slope Inclination on Vertical Foot Loading Using a Novel Force Sensor Instrumentation System

2014 ◽  
Vol 44 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Jiří Baláš ◽  
Michaela Panáčková ◽  
Soňa Jandová ◽  
Andrew J. Martin ◽  
Barbora Strejcová ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Uptake ◽  
Physiological Responses ◽  
Force Sensor ◽  
Slope Inclination ◽  
Vertical Loading ◽  
Time Integral ◽  
Climbing Ability ◽  
Force Time ◽  
Force Time Integral

Abstract The aim of the study was to assess the effects of climbing ability and slope inclination on vertical loading both in terms the forces involved and physiological responses. Five novice and six intermediate female climbers completed a climbing route at three slope inclinations (85°, 90°, and 98°). The vertical loading during the climb was assessed by force-time integral using a Novel Pedar-X insole and physiological responses via oxygen uptake and heart rate. The novice climbers had a significantly lower (p < 0.05) vertical loading on foot holds and higher oxygen uptake and heart rate compared to intermediate climbers. A significant negative correlation was identified between the force-time integral and oxygen uptake (R = -0.72), and with heart rate (R = -0.64), respectively. The time-force integral decreased across the ascents with increasing slope inclination (p < 0.001). The results indicate that more advanced ability climbers make greater use of foot holds, with associated lowering in physiological response (oxygen uptake and heart rate) across all slope inclinations.

scholarly journals Evaluation of a Trunk Supporting Exoskeleton for reducing Muscle Fatigue

2019 ◽  
Vol 63 (1) ◽  
pp. 980-983 ◽  
Author(s):  
Nathan Poon ◽  
Logan van Engelhoven ◽  
Homayoon Kazerooni ◽  
Carisa Harris
Keyword(s):  
Oxygen Consumption ◽  
Muscle Fatigue ◽  
Muscle Activity ◽  
Oxygen Consumption Rate ◽  
Muscle Activation ◽  
Consumption Rate ◽  
Erector Spinae ◽  
Endurance Time ◽  
Repetitive Lifting ◽  
Lifting Task

Although the effect of wearing a back-support exoskeleton during lifting has been demonstrated to reduce overall muscle activation, less is known about how wearing exoskeletons affect muscular fatigue and oxygen consumption. The purpose of this study is to evaluate the effect of wearing a back-support exoskeleton (backX) on muscle fatigue during repetitive lifting by assessing whether wearing backX increases endurance time relative to lifting unassisted. A secondary objective of this study is to quantify changes in oxygen consumption rate while performing a repetitive lifting task with and without backX to address a common industry concern. The UC Ergonomics Lab evaluated backX on twelve male subjects by measuring bilateral muscle activity of the erector spinae and oxygen consumption rate. Summary measures of muscle activity for 50 and 90 percent of the repetitive lifting session were used to characterize peak and mean muscle activity. Oxygen consumption rate was collected continuously during the repetitive lifting session. Compared to the unassisted condition, wearing backX reduced peak lumbar erector spinae activation by 16.5% and 21.8% (p < 0.05). The time subjects could hold a back-straining posture after the repetitive lifting session increased by 52% after wearing backX during the lifting task. The was no significant negative change in oxygen consumption rate. This study confirms that wearing a backX reduces muscle activation in the lower back for this specific dynamic lifting task. Additionally, we find that wearing a backX may reduce the risk of low back injuries by reducing muscle activity and increasing endurance time to fatigue

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