***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: Abstract And ersen , V , Fiml and , MS , Mo , D-A , Iversen , VM , Vederhus , T , Rockl and Hellebø , LR , Nordaune , KI , and Saeterbakken , AH . Electromyographic comparison of barbell deadlift , hex bar deadlift , and hip thrust exercises : a cross-over study . J Strength Cond Res 32(3 ) : 587–593 , 2018—The aim of the study was to compare the muscle activation level of the gluteus maximus , biceps femoris , and erector spinae in the hip thrust , barbell deadlift , and hex bar deadlift ; each of which are compound resisted hip extension exercises . After 2 familiarization sessions , 13 resistance-trained men performed a 1 repetition maximum in all 3 exercises in 1 session , in r and omized and counterbalanced order . The whole ascending movement ( concentric phase ) , as well as its lower and upper parts ( whole movement divided in 2 ) , were analyzed . The hip thrust induced greater activation of the gluteus maximus compared with the hex bar deadlift in the whole ( 16 % , p = 0.025 ) and the upper part ( 26 % , p = 0.015 ) of the movement . For the whole movement , the biceps femoris was more activated during barbell deadlift compared with both the hex bar deadlift ( 28 % , p < 0.001 ) and hip thrust ( 20 % , p = 0.005 ) . In the lower part of the movement , the biceps femoris activation was , respectively , 48 % and 26 % higher for the barbell deadlift ( p < 0.001 ) and hex bar deadlift ( p = 0.049 ) compared with hip thrust . Biceps femoris activation in the upper part of the movement was 39 % higher for the barbell deadlift compared with the hex bar deadlift ( p = 0.001 ) and 34 % higher for the hip thrust compared with the hex bar deadlift ( p = 0.002 ) . No differences were displayed for the erector spinae activation ( p = 0.312–0.859 ) . In conclusion , the barbell deadlift was clearly superior in activating the biceps femoris compared with the hex bar deadlift and hip thrust , whereas the hip thrust provided the highest gluteus maximus activation The purpose of this study is to analyze biomechanical differences between the bounce and pause styles of deadlifting .  Twenty physically active males performed deadlifts  at their 75 % one repetition maximum testing utilizing both pause and bounce techniques in a within-subjects r and omized study design . The average peak height the barbell attained from the three bounce style repetitions was used to compute a compatible phase for analysis of the pause style repetitions . Net joint moment impulse ( NJMI ) , work , average vertical ground reaction force ( vGRF ) , vGRF impulse and phase time were computed for two phases , lift off to peak barbell height and the entire ascent . Additionally , the ankle , knee , hip , and trunk angles at the location of peak barbell height . During the lift off to peak barbell height phase , although each of the joints demonstrated significantly less NJMI and work during the bounce style , the hip joint was impacted the most . The average vGRF was greater for the bounce however the vGRF impulse was greater for the pause . The NJMI results for the ascent phase were similar to the lift off to peak barbell height phase , while work was significantly less for the bounce condition compared to the pause condition across all three joints . Strength and conditioning specialists utilizing the deadlift should be aware that the bounce technique does not allow the athlete to develop maximal force production in the early portion of the lift . Further analyses should focus on joint angles and potential vulnerability to injury when the barbell momentum generated from the bounce is lost PURPOSE The purpose of this study was to evaluate differences in hamstring activation during lower body resistance training exercises . This study also sought to assess differences in hamstring-to-quadriceps muscle activation ratios and gender differences therein . METHODS A r and omized repeated measures design was used to compare six resistance training exercises that are commonly believed to train the hamstrings , including the squat , seated leg curl , stiff leg dead lift , single leg stiff leg dead lift , good morning , and Russian curl .  Subjects included 34 college athletes . Outcome measures included the biceps femoris ( H ) and rectus femoris ( Q ) electromyography ( EMG ) and the H-to-Q EMG ratio , for each exercise . RESULTS Main effects were found for the H ( P < 0.001 ) and Q ( P < 0.001 ) . Post hoc analysis identified the specific differences between exercises . In addition , main effects were found for the H-to-Q ratio when analyzed for all subjects ( P < 0.001 ) . Further analysis revealed that women achieved between 53.9 to 89.5 % of the H-to-Q activation ratios of men , for the exercises assessed . In a separate analysis of strength matched women and men , women achieved between 35.9 to 76.0 % of the H-to-Q ratios of men , for these exercises . CONCLUSIONS Hamstring resistance training exercises offer differing degrees of H and Q activation and ratios . Women compared with men , are less able to activate the hamstrings and /or more able to activate the quadriceps . Women may require disproportionately greater training for the hamstrings compared with the quadriceps Abstract McAllister , MJ , Hammond , KG , Schilling , BK , Ferreria , LC , Reed , JP , and Weiss , LW . Muscle activation during various hamstring exercises . J Strength Cond Res 28(6 ) : 1573–1580 , 2014—The dorsal muscles of the lower torso and extremities have often been denoted the “ posterior chain . ” These muscles are used to support the thoracic and lumbar spine and peripheral joints , including the hip , knee , and ankle on the dorsal aspect of the body . This study investigated the relative muscle activity of the hamstring group and selected surrounding musculature during the leg curl , good morning , glute-ham raise , and Romanian deadlift ( RDL ) . Twelve healthy , weight-trained men performed duplicate trials of single repetitions at 85 % 1-repetition maximum for each lift in r and om order , during which surface electromyography and joint angle data were obtained . Repeated measures analysis of variance across the 4 exercises was performed to compare the activity from the erector spinae ( ES ) , gluteus medius ( GMed ) , semitendinosus ( ST ) , biceps femoris ( BF ) , and medial gastrocnemius ( MGas ) . Significant differences ( p ⩽ 0.05 ) were noted in eccentric muscle activity between exercise for the MGas ( p < 0.027 ) , ST ( p < 0.001 ) , BF ( p < 0.001 ) , and ES ( p = 0.032 ) , and in concentric muscle activity , for the ES ( p < 0.001 ) , BF ( p = 0.010 ) , ST ( p = 0.009 ) , MGas ( p < 0.001 ) , and the GMed ( p = 0.018 ) . Bonferroni post hoc analysis revealed significant pairwise differences during eccentric actions for the BF , ST , and MGas . Post hoc analysis also revealed significant pairwise differences during concentric actions for the ES , BF , ST , MGas , and GMed . Each of these showed effect sizes that are large or greater . The main findings of this investigation are that the ST is substantially more active than the BF among all exercises , and hamstring activity was maximized in the RDL and glute-ham raise . Therefore , athletes and coaches who seek to maximize the involvement of the hamstring musculature should consider focusing on the glute-ham raise and RDL BACKGROUND AND PURPOSE Exercise adherence in general is reported to be problematic after cardiac rehabilitation . Additionally , vigorous exercise is associated with impaired exercise adherence . As high-intensity interval training ( HIT ) is frequently used as a therapy to patients with coronary artery disease in cardiac rehabilitation , the objective was to assess long-term exercise adherence following an HIT cardiac rehabilitation programme . METHODS A multicentre r and omized study was carried out . Eligible participants were adults who had previously attended a 12-week HIT cardiac rehabilitation programme , as either a home-based or hospital-based HIT ( treadmill exercise or group exercise ) .  The primary outcome was change in peak oxygen uptake ; secondary outcomes were self-reported and objective ly measured physical activity . RESULTS Out of 83 eligible participants , 76 were available for assessment ( 68 men/8 women , mean age 59 ( 8) years ) at a one-year follow-up . Peak oxygen uptake was significantly elevated above baseline values , ( treadmill exercise : 35.8 ( 6.4 ) vs. 37.4 ( 7.4 ) ml kg(-1 ) min(-1 ) , group exercise : 32.7 ( 6.5 ) vs. 34.1 ( 5.8 ) ml kg(-1 ) min(-1 ) and home-based exercise : 34.5 ( 4.9 ) vs. 36.7 ( 5.8 ) ml kg(-1 ) min(-1 ) at baseline and follow-up , respectively ) , with no significant differences between groups . The majority of the participants ( > 90 % ) met the recommended daily level of 30 minutes of moderate physical activity . The home-based group showed a strong trend towards increased physical activity compared with the hospital-based groups . DISCUSSION The results from this study have shown that both home-based and hospital-based HIT in cardiac rehabilitation induce promising long-term exercise adherence , with maintenance of peak oxygen uptake significantly above baseline values at a one-year follow-up . The implication for physiotherapy practice is that HIT in cardiac rehabilitation induces satisfactory long-term exercise adherence PURPOSE The aim of this study was to examine the relationship between weight lifted in 1 yr of progressive strength training and change in bone mineral density ( BMD ) in a group of calcium-replete , postmenopausal women . METHODS As part of a large clinical trial , 140 calcium-supplemented women , 44 - 66 yr old , were r and omized to a 1-yr progressive strength-training program . Half of the women were using hormone replacement therapy .  Three times weekly , subjects completed two sets of six to eight repetitions in eight core exercises at 70 - 80 % of one repetition maximum .  BMD was measured at baseline and 1 yr . RESULTS In multiple linear regression , the increase in femur trochanter ( FT ) BMD was positively related to total weight lifted ( 0.001 g.cm ( -2 ) ) for a SD of weight lifted , P < 0.01 ) after adjusting for age , baseline factors , HRT status , weight change , cohort , and fitness center . The weighted squats showed the strongest ( 0.002 g.cm(-2 ) ) for a SD of weight lifted , P < 0.001 ) , whereas the back extension exhibited the weakest ( 0.0005 g.cm(-2 ) ) for a SD of weight lifted , P < 0.26 ) association with change in FT BMD . The amount of weight lifted in the weighted march exercise was significantly related to total body BMD ( 0.0006 g.cm(-2 ) ) for a SD of weight lifted , P < 0.01 ) . The associations between weight lifted and BMD for the femur neck or lumbar spine were not significant . CONCLUSION Evidence of a linear relationship between BMD change and total and exercise-specific weight lifted in a 1-yr strength-training program reinforces the positive association between this type of exercise and BMD in postmenopausal women OBJECTIVES To examine the effects of a ten week deadlift training program on peak torque and agonist-antagonist coactivation . METHODS Fifty-four untrained subjects ( mean age=23 years ) participated in this investigation , and were r and omly assigned to a training ( males , n=17 ; females , n=17 ) or control ( males , n=9 ; females , n=11 ) group . The subjects in the training group performed deadlifts twice per week . Isometric peak torque for the leg extensors and flexors and surface electromyographic ( EMG ) amplitude for the superficial quadriceps and biceps femoris muscles were assessed . RESULTS Deadlift training increased leg extension peak torque for the males ( P=.008 , Cohen 's d=0.43 ) and females ( P=.003 , d=0.48 ) . Leg flexion peak torque improved for the females ( P=.001 , d=0.45 ) . Increased EMG amplitude for the superficial quadriceps femoris muscles when they served as agonists was demonstrated for the females ( P=.010 , d=0.40 ) , but not the males ( P=.059 , d=0.20 ) . For both sexes , the effect sizes for the decline in biceps femoris coactivation were large . CONCLUSION Deadlift training elicited improvements in strength and agonist-antagonist coactivation in untrained subjects , and particularly , novice females The purpose of this study was to examine the biomechanical differences between two set up variations during the isometric initiation of conventional barbell deadlifts ( DL ) : Close-bar DL ( CBDL ) , where the bar is positioned above the navicular , and far-bar DL ( FBDL ) , where the bar is placed above the 3rd metatarsophalangeal joint . A cross-sectional , r and omized , within-participant pilot study was used . Experienced powerlifters and weightlifters 
    Output:
    
Major findings indicate that the biceps femoris is the most studied muscle , followed by gluteus maximus , vastus lateralis and erector spinae .
Erector spinae and quadriceps muscles reported greater activation than gluteus maximus and biceps femoris muscles during Deadlift exercise and its variants .
However , the Romanian Deadlift is associated with lower activation for erector spinae than for biceps femoris and semitendinosus .
Deadlift also showed greater activation of the quadriceps muscles than the gluteus maximus and hamstring muscles .
In general , semitendinosus muscle activation predominates over that of biceps femoris within hamstring muscles complex .