Physiological Limits in Lifting

Khalil, Tarek M.; Genaidy, Ash; Asfour, Shihab; Vinciguerra, T.

doi:10.1080/15298668591394699

Cited by 22 publications

(6 citation statements)

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“…Similar discrepancies in task-specific and standardized maximal aerobic protocols were reported in previous investigations (Petrofsky and Lind 1978;Khalil et al 1985;Sharp et al 1988;Nindl et al 1998;Bilzon et al 2002;Watts 2004). Nindl et al (1998) showed a modest correlation in peak oxygen uptake values between repetitive lifting and treadmill running (r=0.73 and 0.60 for men and women, respectively).…”

Section: Implications Of Measuring Maximal Aerobic Capacitysupporting

confidence: 81%

“…Maximal aerobic power of repetitive lifting was 78% of treadmill, 89% of cycling, and 125% of arm cranking values (Sharp et al 1988). For various lifting tasks, Khalil et al (1985) reported maximal aerobic power as 91% of cycling values. Depending on the frequency and weight of the load lifted or lowered, average lifting and lowering maximal aerobic power values were 19-47% lower than the cycling values (Petrofsky and Lind 1978).…”

Section: Implications Of Measuring Maximal Aerobic Capacitymentioning

confidence: 99%

“…Evaluating the worker's performance using traditional aerobic protocols alone (on either a treadmill, cycle, or arm ergometer) instead of task-specific maximal or submaximal aerobic protocols, may or may not identify the individual's true physical capacity (McConnell et al 1984;Khalil et al 1985;Sharp et al 1988;Waters et al 1993;Nindl et al 1998;Bilzon et al 2001Bilzon et al , 2002. Compared to the standardized ergometric protocols, these authors argued that there is considerable variation in human performance in the tasks (e.g., lifting, lowering, pushing, pulling, carrying, etc.)…”

Section: Introductionmentioning

confidence: 97%

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Comparisons of physiological and perceptual responses in healthy men and women during standardized arm cranking and task-specific pushing–pulling

Maikala

Bhambhani

2005

Int Arch Occup Environ Health

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Based on the physiological differences, pushing-pulling is found to be metabolically less efficient than arm cranking. However, greater ratings of perceived exertion during pushing-pulling implies that the perception of effort can also be influenced by a low intensity task, such as pushing-pulling, if performed for a prolonged period. Occupational health professionals should be aware of the limitations of utilizing physiological and perceptual responses obtained only from standardized ergometric protocols in predicting the workers' performance effectiveness.

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Section: Implications Of Measuring Maximal Aerobic Capacitysupporting

confidence: 81%

Section: Implications Of Measuring Maximal Aerobic Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Comparisons of physiological and perceptual responses in healthy men and women during standardized arm cranking and task-specific pushing–pulling

Maikala

Bhambhani

2005

Int Arch Occup Environ Health

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“…For men, this value (42.8 ml á kg A1 á min A1 ) was 10.6% greater than the O 2peak for maximal squat lifting of ten male forestry workers (38.7 ml á kg A1 á min A1 , Hagen et al 1993), and 5.4% greater than that reported for eight untrained men (40.6 ml á kg A1 á min A1 , Khalil et al 1985). The RL O 2peak for the women (39.0 ml á kg A1 á min A1 ) in the present study is comparable to these values for men, and is 13% greater than the only other reported data for women (n=7, 34.4 ml á kg A1 á min A1 ; Williams et al 1982).…”

Section: Discussionmentioning

confidence: 47%

“…It has been shown that isometric actions lead to premature fatigue due to a reduced peripheral and local blood¯ow, whereas rhythmic exercise such as TR actually helps to facilitate circulating blood¯ow (Lind and McNicol 1967). Additionally, when isometric exercise is superimposed with rhythmic exercise, an uncoupling of the HR/ O 2 relationship has been demonstrated (Khalil et al 1985;Petrofsky and Lind 1978b). Based on the previous data (Petrofsky and Lind 1978a;Sharp et al 1988), it was expected that the O 2peak for RL would be less than for TR.…”

Section: Discussionmentioning

confidence: 97%

Gender comparison of peak oxygen uptake: repetitive box lifting versus treadmill running

Nindl

Sharp

Mello

et al. 1997

European Journal of Applied Physiology

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The gender differences in peak oxygen uptake (VO2peak) for various modes of exercise have been examined previously; however, no direct gender comparisons have been made during repetitive lifting (RL). In the present study the VO2peak between RL and treadmill running (TR) was compared between 20 men [mean (SD) age, height, body mass and body fat: 21 (3) years, 1.79 (0.06) m, 81 (9) kg, 19 (6)%, respectively] and 20 women [mean (SD) age, height, body mass and body fat: 21 (3) years, 1.63 (0.05) m, 60 (7) kg, 27 (6)%, respectively]. VO2peak (l x min[-1]), defined as the highest value obtained during exercise to volitional fatigue, was determined using discontinuous protocols with treadmill grade or box mass incremented to increase exercise intensity. For RL VO2peak, a pneumatically driven shelf was used to lower a loaded box to the floor, and subjects then lifted the box, at a rate of 15 lifts x min(-1). VO2peak (l x min(-1) and ml x kg(-1) x min[-1]) and minute ventilation (VE, l x min[-1]) were determined using an on-line gas analysis system. A two-way repeated measures analysis of variance revealed significant gender effects, with men having higher values for VO2peak (l x min(-1) and ml x kg(-1) x min[-1]) and VE, but women having higher values of the ventilatory equivalent for oxygen (VE/VO2). There were also mode of exercise effects, with TR values being higher for VO2peak (l x min(-1) and ml x kg(-1) x min[-1]) and VE and an interaction effect for VO2peak (l x min(-1) and ml x kg(-1) x min[-1]) and VE/VO2. The women obtained a greater percentage (approximately 84%) of their TR VO2peak during RL than did the men (approximately 79%). There was a marginal tendency for women to decrease and men to increase their VE/VO2 when comparing TR with RL. The magnitude of the gender differences between the two exercise modalities appeared to be similar for heart rate, VE and R, but differed for VO2peak (l x min(-1) and ml x kg(-1) x min[-1]). Lifting to an absolute height (1.32 m for the RL protocol) may present a different physical challenge to men and women with respect to the degree of involvement of the muscle groups used during lifting and ventilation.

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Physiological and subjective responses to maximal repetitive lifting employing stoop and squat technique

1993

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To establish safe levels for physical strain in occupational repetitive lifting, it is of interest to know the specific maximal working capacity. Power output, O2 consumption, heart rate and ventilation were measured in ten experienced forestry workers during maximal squat and stoop repetitive lifting. The two modes of repetitive lifting were also compared with maximal treadmill running. In addition, electromyogram (EMG) activity in four muscles was recorded and perceived central, local low-back and thigh exertion were assessed during the lifting modes. No significant difference was found in power output between the two lifting techniques. Despite this the mean O2 consumption was significantly greater during maximal squat lifting [38.7 (SD 5.8) ml.kg-1.min-1] than maximal stoop lifting [32.9 (SD 5.7) ml.kg-1.min-1] (P < 0.001). No significant correlation was found between O2 consumption (in millilitres per kilogram per minute) during maximal treadmill running and maximal stoop lifting, while O2 consumption during maximal squat lifting correlated highly with that of maximal treadmill running (r = 0.928, P < 0.001) and maximal stoop lifting (r = 0.808, P < 0.01). While maximal heart rates were significantly different among the three types of exercise, no such differences were found in the central rated perceived exertions. Perceived low-back exertion was rated significantly lower during squat lifting than during stoop lifting. The EMG recordings showed a higher activity for the vastus lateralis muscle and lower activity for the biceps femoris muscle during squat lifting than during stoop lifting. Related to the maximal voluntary contraction, the erector spinae muscle showed the highest activity irrespective of lifting technique.

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Physiological Limits in Lifting

Cited by 22 publications

References 0 publications

Comparisons of physiological and perceptual responses in healthy men and women during standardized arm cranking and task-specific pushing–pulling

Comparisons of physiological and perceptual responses in healthy men and women during standardized arm cranking and task-specific pushing–pulling

Gender comparison of peak oxygen uptake: repetitive box lifting versus treadmill running

Physiological and subjective responses to maximal repetitive lifting employing stoop and squat technique

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