Biomedical subjects

Neil E Fowler

Publications and source records attributed to Neil E Fowler.

3 recordsLinked to original sources

PubMed2005

Raised paraspinal muscle activity reduces rate of stature recovery after loaded exercise in individuals with chronic low back pain.

OBJECTIVES: To further the understanding of stature recovery in subjects with and without chronic low back pain (CLBP) and to determine the relations among stature recovery, paraspinal muscle activity, and perceived pain and disability. DESIGN: A case-control study in which stature loss and recovery were assessed in subjects with and without CLBP after a 20-minute loaded walking task (10% of body mass). Group differences in pain, disability, and paraspinal muscle activity were also assessed. SETTING: A university laboratory. PARTICIPANTS: Twenty subjects with CLBP were matched (age, sex, body mass, physical activity level) with 20 controls who were recruited through notices in the university, general community, and local Primary Care Trust. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Stature changes and integrated electromyograms of the paraspinal muscles during a loading and unloading period were assessed. RESULTS: Stature changes after loading did not differ between groups ( P <.05). Subjects with CLBP recovered significantly less stature during unloading than did the controls ( P <.05). Paraspinal muscle activity correlated negatively with stature recovery ( P <.05). Relations among stature recovery, pain, and disability were shown ( P <.05). CONCLUSIONS: The elevated paraspinal muscle activity exhibited by the CLBP group increased compression on the intervertebral disks and diminished their ability to recover the height lost through loaded exercise. Further research is required to establish whether a change in paraspinal muscle activity is associated with corresponding changes in stature recovery, and if this has any clinical implications by reducing pain and disability.

Adult↗

PubMed2003

Stature loss and recovery in pregnant women with and without low back pain.

OBJECTIVES: To assess the loss of stature and its recovery in normal and pregnant women with and without low back pain (LBP) and to examine the relations between spinal shrinkage, recovery, and LBP. DESIGN: Stature changes were measured before and after physical activity in each group and differences in response compared between groups. SETTING: A laboratory environment. PARTICIPANTS: Thirty-one women (7 pregnant without LBP, 8 pregnant with LBP, 16 nonpregnant with no history of low back disorders) were recruited using convenience sampling. Controls were recruited from the general community; subjects in the pregnant groups were recruited from local primary care groups. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Stature change was assessed as the main outcome measure. Changes in stature were interpreted with respect to the woman's stature at the start of the trial. RESULTS: Stature loss induced by a moderate physical activity was similar (P>.05) in all groups (control, -3.99+/-1.13 mm; pregnant no back pain, -4.23+/-1.23 mm; pregnant with back pain, -4.57+/-1.53 mm). Differences were found after 20 minutes in a recovery position (P<.05): the controls were able to recover stature to a greater extent (111.2%+/-13.6%) than the other groups (P<.05). A negative correlation was found between regain in stature and LBP in pregnant subjects (r=-.81, P<.05). CONCLUSIONS: The pregnant women with LBP were unable to recover stature to the same extent as the controls and pregnant women without LBP. Results suggest that LBP in pregnancy may be related to the woman's diminished ability to recover, rather than the magnitude of the spinal shrinkage imposed during the task.

Adult↗

PubMed2002

Vertical jump coordination: fatigue effects.

PURPOSE: The aim of this study was to investigate the segmental coordination of vertical jumps under fatigue of the knee extensor and flexor muscles. METHODS: Eleven healthy and active subjects performed maximal vertical jumps with and without fatigue, which was imposed by requesting the subjects to extend/flex their knees continuously in a weight machine, until they could not lift a load corresponding to approximately 50% of their body weight. Knee extensor and flexor isokinetic peak torques were also measured before and after fatigue. Video, ground reaction forces, and electromyographic data were collected simultaneously and used to provide several variables of the jumps. RESULTS: Fatiguing the knee flexor muscles did not reduce the height of the jumps or induce changes in the kinematic, kinetic, and electromyographic profiles. Knee extensor fatigue caused the subjects to adjust several variables of the movement, in which the peak joint angular velocity, peak joint net moment, and power around the knee were reduced and occurred earlier in comparison with the nonfatigued jumps. The electromyographic data analyses indicated that the countermovement jumps were performed similarly, i.e., a single strategy was used, irrespective of which muscle group (extensor or flexors) or the changes imposed on the muscle force-generating characteristics (fatigue or nonfatigue). The subjects executed the movements as if they scaled a robust template motor program, which guided the movement execution in all jump conditions. It was speculated that training programs designed to improve jump height performance should avoid severe fatigue levels, which may cause the subjects to learn and adopt a nonoptimal and nonspecific coordination solution. CONCLUSION: It was suggested that the neural input used in the fatigued condition did not constitute an optimal solution and may have played a role in decreasing maximal jump height achievement.

Adult↗